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system.api.php
#1037352 by jhodgdon: hook_permission() is missing doc about 'warning'.
Angie Byron authored
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system.api.php 172.46 KiB
<?php
/**
* @file
* Hooks provided by Drupal core and the System module.
*/
/**
* @addtogroup hooks
* @{
*/
/**
* Defines one or more hooks that are exposed by a module.
*
* Normally hooks do not need to be explicitly defined. However, by declaring a
* hook explicitly, a module may define a "group" for it. Modules that implement
* a hook may then place their implementation in either $module.module or in
* $module.$group.inc. If the hook is located in $module.$group.inc, then that
* file will be automatically loaded when needed.
* In general, hooks that are rarely invoked and/or are very large should be
* placed in a separate include file, while hooks that are very short or very
* frequently called should be left in the main module file so that they are
* always available.
*
* @return
* An associative array whose keys are hook names and whose values are an
* associative array containing:
* - group: A string defining the group to which the hook belongs. The module
* system will determine whether a file with the name $module.$group.inc
* exists, and automatically load it when required.
*
* See system_hook_info() for all hook groups defined by Drupal core.
*
* @see hook_hook_info_alter().
*/
function hook_hook_info() {
$hooks['token_info'] = array(
'group' => 'tokens',
);
$hooks['tokens'] = array(
'group' => 'tokens',
);
return $hooks;
}
/**
* Alter information from hook_hook_info().
*
* @param $hooks
* Information gathered by module_hook_info() from other modules'
* implementations of hook_hook_info(). Alter this array directly.
* See hook_hook_info() for information on what this may contain.
*/
function hook_hook_info_alter(&$hooks) {
// Our module wants to completely override the core tokens, so make
// sure the core token hooks are not found.
$hooks['token_info']['group'] = 'mytokens';
$hooks['tokens']['group'] = 'mytokens';
}
/**
* Inform the base system and the Field API about one or more entity types.
*
* Inform the system about one or more entity types (i.e., object types that
* can be loaded via entity_load() and, optionally, to which fields can be
* attached).
*
* @return
* An array whose keys are entity type names and whose values identify * properties of those types that the system needs to know about:
* - label: The human-readable name of the type.
* - controller class: The name of the class that is used to load the objects.
* The class has to implement the DrupalEntityControllerInterface interface.
* Leave blank to use the DrupalDefaultEntityController implementation.
* - base table: (used by DrupalDefaultEntityController) The name of the
* entity type's base table.
* - static cache: (used by DrupalDefaultEntityController) FALSE to disable
* static caching of entities during a page request. Defaults to TRUE.
* - field cache: (used by Field API loading and saving of field data) FALSE
* to disable Field API's persistent cache of field data. Only recommended
* if a higher level persistent cache is available for the entity type.
* Defaults to TRUE.
* - load hook: The name of the hook which should be invoked by
* DrupalDefaultEntityController:attachLoad(), for example 'node_load'.
* - uri callback: A function taking an entity as argument and returning the
* uri elements of the entity, e.g. 'path' and 'options'. The actual entity
* uri can be constructed by passing these elements to url().
* - label callback: (optional) A function taking an entity as argument and
* returning the label of the entity. The entity label is the main string
* associated with an entity; for example, the title of a node or the
* subject of a comment. If there is an entity object property that defines
* the label, use the 'label' element of the 'entity keys' return
* value component to provide this information (see below). If more complex
* logic is needed to determine the label of an entity, you can instead
* specify a callback function here, which will be called to determine the
* entity label. See also the entity_label() function, which implements this
* logic.
* - fieldable: Set to TRUE if you want your entity type to be fieldable.
* - translation: An associative array of modules registered as field
* translation handlers. Array keys are the module names, array values
* can be any data structure the module uses to provide field translation.
* Any empty value disallows the module to appear as a translation handler.
* - entity keys: An array describing how the Field API can extract the
* information it needs from the objects of the type. Elements:
* - id: The name of the property that contains the primary id of the
* entity. Every entity object passed to the Field API must have this
* property and its value must be numeric.
* - revision: The name of the property that contains the revision id of
* the entity. The Field API assumes that all revision ids are unique
* across all entities of a type. This entry can be omitted if the
* entities of this type are not versionable.
* - bundle: The name of the property that contains the bundle name for the
* entity. The bundle name defines which set of fields are attached to
* the entity (e.g. what nodes call "content type"). This entry can be
* omitted if this entity type exposes a single bundle (all entities have
* the same collection of fields). The name of this single bundle will be
* the same as the entity type.
* - label: The name of the property that contains the entity label. For
* example, if the entity's label is located in $entity->subject, then
* 'subject' should be specified here. If complex logic is required to
* build the label, a 'label callback' should be defined instead (see
* the 'label callback' section above for details).
* - bundle keys: An array describing how the Field API can extract the
* information it needs from the bundle objects for this type. This entry
* is required if the 'path' provided in the 'bundles'/'admin' section
* identifies the bundle using a named menu placeholder whose loader
* callback returns an object (e.g., $vocabulary for taxonomy terms, or
* $node_type for nodes). If the path does not include the bundle, or the
* bundle is just a string rather than an automatically loaded object, then
* this can be omitted. Elements:
* - bundle: The name of the property of the bundle object that contains
* the name of the bundle object.
* - bundles: An array describing all bundles for this object type. Keys are
* bundles machine names, as found in the objects' 'bundle' property
* (defined in the 'entity keys' entry above). Elements:
* - label: The human-readable name of the bundle.
* - uri callback: Same as the 'uri callback' key documented above for the
* entity type, but for the bundle only. When determining the URI of an
* entity, if a 'uri callback' is defined for both the entity type and * the bundle, the one for the bundle is used.
* - admin: An array of information that allows Field UI pages to attach
* themselves to the existing administration pages for the bundle.
* Elements:
* - path: the path of the bundle's main administration page, as defined
* in hook_menu(). If the path includes a placeholder for the bundle,
* the 'bundle argument' and 'real path' keys below are required.
* - bundle argument: The position of the bundle placeholder in 'path', if
* any.
* - real path: The actual path (no placeholder) of the bundle's main
* administration page. This will be used to generate links.
* - access callback: As in hook_menu(). 'user_access' will be assumed if
* no value is provided.
* - access arguments: As in hook_menu().
* - view modes: An array describing the view modes for the entity type. View
* modes let entities be displayed differently depending on the context.
* For instance, a node can be displayed differently on its own page
* ('full' mode), on the home page or taxonomy listings ('teaser' mode), or
* in an RSS feed ('rss' mode). Modules taking part in the display of the
* entity (notably the Field API) can adjust their behavior depending on
* the requested view mode. An additional 'default' view mode is available
* for all entity types. This view mode is not intended for actual entity
* display, but holds default display settings. For each available view
* mode, administrators can configure whether it should use its own set of
* field display settings, or just replicate the settings of the 'default'
* view mode, thus reducing the amount of display configurations to keep
* track of. Keys of the array are view mode names. Each view mode is
* described by an array with the following key/value pairs:
* - label: The human-readable name of the view mode
* - custom settings: A boolean specifying whether the view mode should by
* default use its own custom field display settings. If FALSE, entities
* displayed in this view mode will reuse the 'default' display settings
* by default (e.g. right after the module exposing the view mode is
* enabled), but administrators can later use the Field UI to apply custom
* display settings specific to the view mode.
*
* @see entity_load()
* @see hook_entity_info_alter()
*/
function hook_entity_info() {
$return = array(
'node' => array(
'label' => t('Node'),
'controller class' => 'NodeController',
'base table' => 'node',
'revision table' => 'node_revision',
'uri callback' => 'node_uri',
'fieldable' => TRUE,
'translation' => array(
'locale' => TRUE,
),
'entity keys' => array(
'id' => 'nid',
'revision' => 'vid',
'bundle' => 'type',
),
'bundle keys' => array(
'bundle' => 'type',
),
'bundles' => array(),
'view modes' => array(
'full' => array(
'label' => t('Full content'),
'custom settings' => FALSE,
),
'teaser' => array(
'label' => t('Teaser'),
'custom settings' => TRUE,
),
'rss' => array( 'label' => t('RSS'),
'custom settings' => FALSE,
),
),
),
);
// Search integration is provided by node.module, so search-related
// view modes for nodes are defined here and not in search.module.
if (module_exists('search')) {
$return['node']['view modes'] += array(
'search_index' => array(
'label' => t('Search index'),
'custom settings' => FALSE,
),
'search_result' => array(
'label' => t('Search result'),
'custom settings' => FALSE,
),
);
}
// Bundles must provide a human readable name so we can create help and error
// messages, and the path to attach Field admin pages to.
foreach (node_type_get_names() as $type => $name) {
$return['node']['bundles'][$type] = array(
'label' => $name,
'admin' => array(
'path' => 'admin/structure/types/manage/%node_type',
'real path' => 'admin/structure/types/manage/' . str_replace('_', '-', $type),
'bundle argument' => 4,
'access arguments' => array('administer content types'),
),
);
}
return $return;
}
/**
* Alter the entity info.
*
* Modules may implement this hook to alter the information that defines an
* entity. All properties that are available in hook_entity_info() can be
* altered here.
*
* @param $entity_info
* The entity info array, keyed by entity name.
*
* @see hook_entity_info()
*/
function hook_entity_info_alter(&$entity_info) {
// Set the controller class for nodes to an alternate implementation of the
// DrupalEntityController interface.
$entity_info['node']['controller class'] = 'MyCustomNodeController';
}
/**
* Act on entities when loaded.
*
* This is a generic load hook called for all entity types loaded via the
* entity API.
*
* @param $entities
* The entities keyed by entity ID.
* @param $type
* The type of entities being loaded (i.e. node, user, comment).
*/
function hook_entity_load($entities, $type) {
foreach ($entities as $entity) { $entity->foo = mymodule_add_something($entity, $type);
}
}
/**
* Act on an entity before it is about to be created or updated.
*
* @param $entity
* The entity object.
* @param $type
* The type of entity being saved (i.e. node, user, comment).
*/
function hook_entity_presave($entity, $type) {
$entity->changed = REQUEST_TIME;
}
/**
* Act on entities when inserted.
*
* @param $entity
* The entity object.
* @param $type
* The type of entity being inserted (i.e. node, user, comment).
*/
function hook_entity_insert($entity, $type) {
// Insert the new entity into a fictional table of all entities.
$info = entity_get_info($type);
list($id) = entity_extract_ids($type, $entity);
db_insert('example_entity')
->fields(array(
'type' => $type,
'id' => $id,
'created' => REQUEST_TIME,
'updated' => REQUEST_TIME,
))
->execute();
}
/**
* Act on entities when updated.
*
* @param $entity
* The entity object.
* @param $type
* The type of entity being updated (i.e. node, user, comment).
*/
function hook_entity_update($entity, $type) {
// Update the entity's entry in a fictional table of all entities.
$info = entity_get_info($type);
list($id) = entity_extract_ids($type, $entity);
db_update('example_entity')
->fields(array(
'updated' => REQUEST_TIME,
))
->condition('type', $type)
->condition('id', $id)
->execute();
}
/**
* Act on entities when deleted.
*
* @param $entity
* The entity object.
* @param $type
* The type of entity being deleted (i.e. node, user, comment).
*/
function hook_entity_delete($entity, $type) {
// Delete the entity's entry from a fictional table of all entities.
$info = entity_get_info($type); list($id) = entity_extract_ids($type, $entity);
db_delete('example_entity')
->condition('type', $type)
->condition('id', $id)
->execute();
}
/**
* Alter or execute an EntityFieldQuery.
*
* @param EntityFieldQuery $query
* An EntityFieldQuery. One of the most important properties to be changed is
* EntityFieldQuery::executeCallback. If this is set to an existing function,
* this function will get the query as its single argument and its result
* will be the returned as the result of EntityFieldQuery::execute(). This can
* be used to change the behavior of EntityFieldQuery entirely. For example,
* the default implementation can only deal with one field storage engine, but
* it is possible to write a module that can query across field storage
* engines. Also, the default implementation presumes entities are stored in
* SQL, but the execute callback could instead query any other entity storage,
* local or remote.
*
* Note the $query->altered attribute which is TRUE in case the query has
* already been altered once. This happens with cloned queries.
* If there is a pager, then such a cloned query will be executed to count
* all elements. This query can be detected by checking for
* ($query->pager && $query->count), allowing the driver to return 0 from
* the count query and disable the pager.
*/
function hook_entity_query_alter($query) {
$query->executeCallback = 'my_module_query_callback';
}
/**
* Act on entities being assembled before rendering.
*
* @param $entity
* The entity object.
* @param $type
* The type of entity being rendered (i.e. node, user, comment).
* @param $view_mode
* The view mode the entity is rendered in.
* @param $langcode
* The language code used for rendering.
*
* The module may add elements to $entity->content prior to rendering. The
* structure of $entity->content is a renderable array as expected by
* drupal_render().
*
* @see hook_entity_view_alter()
* @see hook_comment_view()
* @see hook_node_view()
* @see hook_user_view()
*/
function hook_entity_view($entity, $type, $view_mode, $langcode) {
$entity->content['my_additional_field'] = array(
'#markup' => $additional_field,
'#weight' => 10,
'#theme' => 'mymodule_my_additional_field',
);
}
/**
* Alter the results of ENTITY_view().
*
* This hook is called after the content has been assembled in a structured
* array and may be used for doing processing which requires that the complete
* entity content structure has been built.
*
* If a module wishes to act on the rendered HTML of the entity rather than the * structured content array, it may use this hook to add a #post_render
* callback. Alternatively, it could also implement hook_preprocess_ENTITY().
* See drupal_render() and theme() for details.
*
* @param $build
* A renderable array representing the entity content.
* @param $type
* The type of entity being rendered (i.e. node, user, comment).
*
* @see hook_entity_view()
* @see hook_comment_view_alter()
* @see hook_node_view_alter()
* @see hook_taxonomy_term_view_alter()
* @see hook_user_view_alter()
*/
function hook_entity_view_alter(&$build, $type) {
if ($build['#view_mode'] == 'full' && isset($build['an_additional_field'])) {
// Change its weight.
$build['an_additional_field']['#weight'] = -10;
// Add a #post_render callback to act on the rendered HTML of the entity.
$build['#post_render'][] = 'my_module_node_post_render';
}
}
/**
* Define administrative paths.
*
* Modules may specify whether or not the paths they define in hook_menu() are
* to be considered administrative. Other modules may use this information to
* display those pages differently (e.g. in a modal overlay, or in a different
* theme).
*
* To change the administrative status of menu items defined in another module's
* hook_menu(), modules should implement hook_admin_paths_alter().
*
* @return
* An associative array. For each item, the key is the path in question, in
* a format acceptable to drupal_match_path(). The value for each item should
* be TRUE (for paths considered administrative) or FALSE (for non-
* administrative paths).
*
* @see hook_menu()
* @see drupal_match_path()
* @see hook_admin_paths_alter()
*/
function hook_admin_paths() {
$paths = array(
'mymodule/*/add' => TRUE,
'mymodule/*/edit' => TRUE,
);
return $paths;
}
/**
* Redefine administrative paths defined by other modules.
*
* @param $paths
* An associative array of administrative paths, as defined by implementations
* of hook_admin_paths().
*
* @see hook_admin_paths()
*/
function hook_admin_paths_alter(&$paths) {
// Treat all user pages as administrative.
$paths['user'] = TRUE;
$paths['user/*'] = TRUE;
// Treat the forum topic node form as a non-administrative page.
$paths['node/add/forum'] = FALSE;
}
/**
* Act on entities as they are being prepared for view.
*
* Allows you to operate on multiple entities as they are being prepared for
* view. Only use this if attaching the data during the entity_load() phase
* is not appropriate, for example when attaching other 'entity' style objects.
*
* @param $entities
* The entities keyed by entity ID.
* @param $type
* The type of entities being loaded (i.e. node, user, comment).
*/
function hook_entity_prepare_view($entities, $type) {
// Load a specific node into the user object for later theming.
if ($type == 'user') {
$nodes = mymodule_get_user_nodes(array_keys($entities));
foreach ($entities as $uid => $entity) {
$entity->user_node = $nodes[$uid];
}
}
}
/**
* Perform periodic actions.
*
* This hook will only be called if cron.php is run (e.g. by crontab).
*
* Modules that require some commands to be executed periodically can
* implement hook_cron(). The engine will then call the hook whenever a cron
* run happens, as defined by the administrator. Typical tasks managed by
* hook_cron() are database maintenance, backups, recalculation of settings
* or parameters, automated mailing, and retrieving remote data.
*
* Short-running or non-resource-intensive tasks can be executed directly in
* the hook_cron() implementation.
*
* Long-running tasks and tasks that could time out, such as retrieving remote
* data, sending email, and intensive file tasks, should use the queue API
* instead of executing the tasks directly. To do this, first define one or
* more queues via hook_cron_queue_info(). Then, add items that need to be
* processed to the defined queues.
*/
function hook_cron() {
// Short-running operation example, not using a queue:
// Delete all expired records since the last cron run.
$expires = variable_get('mymodule_cron_last_run', REQUEST_TIME);
db_delete('mymodule_table')
->condition('expires', $expires, '>=')
->execute();
variable_set('mymodule_cron_last_run', REQUEST_TIME);
// Long-running operation example, leveraging a queue:
// Fetch feeds from other sites.
$result = db_query('SELECT * FROM {aggregator_feed} WHERE checked + refresh < :time AND refresh != :never', array(
':time' => REQUEST_TIME,
':never' => AGGREGATOR_CLEAR_NEVER,
));
$queue = DrupalQueue::get('aggregator_feeds');
foreach ($result as $feed) {
$queue->createItem($feed);
}
}
/**
* Declare queues holding items that need to be run periodically.
*
* While there can be only one hook_cron() process running at the same time,
* there can be any number of processes defined here running. Because of
* this, long running tasks are much better suited for this API. Items queued * in hook_cron() might be processed in the same cron run if there are not many
* items in the queue, otherwise it might take several requests, which can be
* run in parallel.
*
* @return
* An associative array where the key is the queue name and the value is
* again an associative array. Possible keys are:
* - 'worker callback': The name of the function to call. It will be called
* with one argument, the item created via DrupalQueue::createItem() in
* hook_cron().
* - 'time': (optional) How much time Drupal should spend on calling this
* worker in seconds. Defaults to 15.
*
* @see hook_cron()
* @see hook_cron_queue_info_alter()
*/
function hook_cron_queue_info() {
$queues['aggregator_feeds'] = array(
'worker callback' => 'aggregator_refresh',
'time' => 60,
);
return $queues;
}
/**
* Alter cron queue information before cron runs.
*
* Called by drupal_cron_run() to allow modules to alter cron queue settings
* before any jobs are processesed.
*
* @param array $queues
* An array of cron queue information.
*
* @see hook_cron_queue_info()
* @see drupal_cron_run()
*/
function hook_cron_queue_info_alter(&$queues) {
// This site has many feeds so let's spend 90 seconds on each cron run
// updating feeds instead of the default 60.
$queues['aggregator_feeds']['time'] = 90;
}
/**
* Allows modules to declare their own Forms API element types and specify their
* default values.
*
* This hook allows modules to declare their own form element types and to
* specify their default values. The values returned by this hook will be
* merged with the elements returned by hook_form() implementations and so
* can return defaults for any Form APIs keys in addition to those explicitly
* mentioned below.
*
* Each of the form element types defined by this hook is assumed to have
* a matching theme function, e.g. theme_elementtype(), which should be
* registered with hook_theme() as normal.
*
* For more information about custom element types see the explanation at
* http://drupal.org/node/169815.
*
* @return
* An associative array describing the element types being defined. The array
* contains a sub-array for each element type, with the machine-readable type
* name as the key. Each sub-array has a number of possible attributes:
* - "#input": boolean indicating whether or not this element carries a value
* (even if it's hidden).
* - "#process": array of callback functions taking $element, $form_state,
* and $complete_form.
* - "#after_build": array of callback functions taking $element and $form_state.
* - "#validate": array of callback functions taking $form and $form_state.
* - "#element_validate": array of callback functions taking $element and * $form_state.
* - "#pre_render": array of callback functions taking $element and $form_state.
* - "#post_render": array of callback functions taking $element and $form_state.
* - "#submit": array of callback functions taking $form and $form_state.
* - "#title_display": optional string indicating if and how #title should be
* displayed, see theme_form_element() and theme_form_element_label().
*
* @see hook_element_info_alter()
* @see system_element_info()
*/
function hook_element_info() {
$types['filter_format'] = array(
'#input' => TRUE,
);
return $types;
}
/**
* Alter the element type information returned from modules.
*
* A module may implement this hook in order to alter the element type defaults
* defined by a module.
*
* @param &$type
* All element type defaults as collected by hook_element_info().
*
* @see hook_element_info()
*/
function hook_element_info_alter(&$type) {
// Decrease the default size of textfields.
if (isset($type['textfield']['#size'])) {
$type['textfield']['#size'] = 40;
}
}
/**
* Perform cleanup tasks.
*
* This hook is run at the end of each page request. It is often used for
* page logging and specialized cleanup. This hook MUST NOT print anything.
*
* Only use this hook if your code must run even for cached page views.
* If you have code which must run once on all non cached pages, use
* hook_init instead. Thats the usual case. If you implement this hook
* and see an error like 'Call to undefined function', it is likely that
* you are depending on the presence of a module which has not been loaded yet.
* It is not loaded because Drupal is still in bootstrap mode.
*
* @param $destination
* If this hook is invoked as part of a drupal_goto() call, then this argument
* will be a fully-qualified URL that is the destination of the redirect.
*/
function hook_exit($destination = NULL) {
db_update('counter')
->expression('hits', 'hits + 1')
->condition('type', 1)
->execute();
}
/**
* Perform necessary alterations to the JavaScript before it is presented on
* the page.
*
* @param $javascript
* An array of all JavaScript being presented on the page.
*
* @see drupal_add_js()
* @see drupal_get_js()
* @see drupal_js_defaults()
*/function hook_js_alter(&$javascript) {
// Swap out jQuery to use an updated version of the library.
$javascript['misc/jquery.js']['data'] = drupal_get_path('module', 'jquery_update') . '/jquery.js';
}
/**
* Registers JavaScript/CSS libraries associated with a module.
*
* Modules implementing this return an array of arrays. The key to each
* sub-array is the machine readable name of the library. Each library may
* contain the following items:
*
* - 'title': The human readable name of the library.
* - 'website': The URL of the library's web site.
* - 'version': A string specifying the version of the library; intentionally
* not a float because a version like "1.2.3" is not a valid float. Use PHP's
* version_compare() to compare different versions.
* - 'js': An array of JavaScript elements; each element's key is used as $data
* argument, each element's value is used as $options array for
* drupal_add_js(). To add library-specific (not module-specific) JavaScript
* settings, the key may be skipped, the value must specify
* 'type' => 'setting', and the actual settings must be contained in a 'data'
* element of the value.
* - 'css': Like 'js', an array of CSS elements passed to drupal_add_css().
* - 'dependencies': An array of libraries that are required for a library. Each
* element is an array listing the module and name of another library. Note
* that all dependencies for each dependent library will also be added when
* this library is added.
*
* Registered information for a library should contain re-usable data only.
* Module- or implementation-specific data and integration logic should be added
* separately.
*
* @return
* An array defining libraries associated with a module.
*
* @see system_library()
* @see drupal_add_library()
* @see drupal_get_library()
*/
function hook_library() {
// Library One.
$libraries['library-1'] = array(
'title' => 'Library One',
'website' => 'http://example.com/library-1',
'version' => '1.2',
'js' => array(
drupal_get_path('module', 'my_module') . '/library-1.js' => array(),
),
'css' => array(
drupal_get_path('module', 'my_module') . '/library-2.css' => array(
'type' => 'file',
'media' => 'screen',
),
),
);
// Library Two.
$libraries['library-2'] = array(
'title' => 'Library Two',
'website' => 'http://example.com/library-2',
'version' => '3.1-beta1',
'js' => array(
// JavaScript settings may use the 'data' key.
array(
'type' => 'setting',
'data' => array('library2' => TRUE),
),
),
'dependencies' => array(
// Require jQuery UI core by System module. array('system', 'ui'),
// Require our other library.
array('my_module', 'library-1'),
// Require another library.
array('other_module', 'library-3'),
),
);
return $libraries;
}
/**
* Alters the JavaScript/CSS library registry.
*
* Allows certain, contributed modules to update libraries to newer versions
* while ensuring backwards compatibility. In general, such manipulations should
* only be done by designated modules, since most modules that integrate with a
* certain library also depend on the API of a certain library version.
*
* @param $libraries
* The JavaScript/CSS libraries provided by $module. Keyed by internal library
* name and passed by reference.
* @param $module
* The name of the module that registered the libraries.
*
* @see hook_library()
*/
function hook_library_alter(&$libraries, $module) {
// Update Farbtastic to version 2.0.
if ($module == 'system' && isset($libraries['farbtastic'])) {
// Verify existing version is older than the one we are updating to.
if (version_compare($libraries['farbtastic']['version'], '2.0', '<')) {
// Update the existing Farbtastic to version 2.0.
$libraries['farbtastic']['version'] = '2.0';
$libraries['farbtastic']['js'] = array(
drupal_get_path('module', 'farbtastic_update') . '/farbtastic-2.0.js' => array(),
);
}
}
}
/**
* Alter CSS files before they are output on the page.
*
* @param $css
* An array of all CSS items (files and inline CSS) being requested on the page.
*
* @see drupal_add_css()
* @see drupal_get_css()
*/
function hook_css_alter(&$css) {
// Remove defaults.css file.
unset($css[drupal_get_path('module', 'system') . '/defaults.css']);
}
/**
* Alter the commands that are sent to the user through the Ajax framework.
*
* @param $commands
* An array of all commands that will be sent to the user.
*
* @see ajax_render()
*/
function hook_ajax_render_alter($commands) {
// Inject any new status messages into the content area.
$commands[] = ajax_command_prepend('#block-system-main .content', theme('status_messages'));
}
/**
* Add elements to a page before it is rendered.
* * Use this hook when you want to add elements at the page level. For your
* additions to be printed, they have to be placed below a top level array key
* of the $page array that has the name of a region of the active theme.
*
* By default, valid region keys are 'page_top', 'header', 'sidebar_first',
* 'content', 'sidebar_second' and 'page_bottom'. To get a list of all regions
* of the active theme, use system_region_list($theme). Note that $theme is a
* global variable.
*
* If you want to alter the elements added by other modules or if your module
* depends on the elements of other modules, use hook_page_alter() instead which
* runs after this hook.
*
* @param $page
* Nested array of renderable elements that make up the page.
*
* @see hook_page_alter()
* @see drupal_render_page()
*/
function hook_page_build(&$page) {
if (menu_get_object('node', 1)) {
// We are on a node detail page. Append a standard disclaimer to the
// content region.
$page['content']['disclaimer'] = array(
'#markup' => t('Acme, Inc. is not responsible for the contents of this sample code.'),
'#weight' => 25,
);
}
}
/**
* Alter a menu router item right after it has been retrieved from the database or cache.
*
* This hook is invoked by menu_get_item() and allows for run-time alteration of router
* information (page_callback, title, and so on) before it is translated and checked for
* access. The passed in $router_item is statically cached for the current request, so this
* hook is only invoked once for any router item that is retrieved via menu_get_item().
*
* Usually, modules will only want to inspect the router item and conditionally
* perform other actions (such as preparing a state for the current request).
* Note that this hook is invoked for any router item that is retrieved by
* menu_get_item(), which may or may not be called on the path itself, so implementations
* should check the $path parameter if the alteration should fire for the current request
* only.
*
* @param $router_item
* The menu router item for $path.
* @param $path
* The originally passed path, for which $router_item is responsible.
* @param $original_map
* The path argument map, as contained in $path.
*
* @see menu_get_item()
*/
function hook_menu_get_item_alter(&$router_item, $path, $original_map) {
// When retrieving the router item for the current path...
if ($path == $_GET['q']) {
// ...call a function that prepares something for this request.
mymodule_prepare_something();
}
}
/**
* Define menu items and page callbacks.
*
* This hook enables modules to register paths in order to define how URL
* requests are handled. Paths may be registered for URL handling only, or they
* can register a link to be placed in a menu (usually the Navigation menu). A
* path and its associated information is commonly called a "menu router item".
* This hook is rarely called (for example, when modules are enabled), and * its results are cached in the database.
*
* hook_menu() implementations return an associative array whose keys define
* paths and whose values are an associative array of properties for each
* path. (The complete list of properties is in the return value section below.)
*
* The definition for each path may include a page callback function, which is
* invoked when the registered path is requested. If there is no other
* registered path that fits the requested path better, any further path
* components are passed to the callback function. For example, your module
* could register path 'abc/def':
* @code
* function mymodule_menu() {
* $items['abc/def'] = array(
* 'page callback' => 'mymodule_abc_view',
* );
* return $items;
* }
*
* function mymodule_abc_view($ghi = 0, $jkl = '') {
* // ...
* }
* @endcode
* When path 'abc/def' is requested, no further path components are in the
* request, and no additional arguments are passed to the callback function (so
* $ghi and $jkl would take the default values as defined in the function
* signature). When 'abc/def/123/foo' is requested, $ghi will be '123' and
* $jkl will be 'foo'. Note that this automatic passing of optional path
* arguments applies only to page and theme callback functions.
*
* In addition to optional path arguments, the page callback and other callback
* functions may specify argument lists as arrays. These argument lists may
* contain both fixed/hard-coded argument values and integers that correspond
* to path components. When integers are used and the callback function is
* called, the corresponding path components will be substituted for the
* integers. That is, the integer 0 in an argument list will be replaced with
* the first path component, integer 1 with the second, and so on (path
* components are numbered starting from zero). This substitution feature allows
* you to re-use a callback function for several different paths. For example:
* @code
* function mymodule_menu() {
* $items['abc/def'] = array(
* 'page callback' => 'mymodule_abc_view',
* 'page arguments' => array(1, 'foo'),
* );
* return $items;
* }
* @endcode
* When path 'abc/def' is requested, the page callback function will get 'def'
* as the first argument and (always) 'foo' as the second argument.
*
* Note that if a page or theme callback function has an argument list array,
* these arguments will be passed first to the function, followed by any
* any arguments generated by optional path arguments as described above.
*
* Special care should be taken for the page callback drupal_get_form(), because
* your specific form callback function will always receive $form and
* &$form_state as the first function arguments:
* @code
* function mymodule_abc_form($form, &$form_state) {
* // ...
* return $form;
* }
* @endcode
* See @link form_api Form API documentation @endlink for details.
*
* Wildcards within paths also work with integer substitution. For example,
* your module could register path 'my-module/%/edit':
* @code
* $items['my-module/%/edit'] = array( * 'page callback' => 'mymodule_abc_edit',
* 'page arguments' => array(1),
* );
* @endcode
* When path 'my-module/foo/edit' is requested, integer 1 will be replaced
* with 'foo' and passed to the callback function.
*
* Registered paths may also contain special "auto-loader" wildcard components
* in the form of '%mymodule_abc', where the '%' part means that this path
* component is a wildcard, and the 'mymodule_abc' part defines the prefix for a
* load function, which here would be named mymodule_abc_load(). When a matching
* path is requested, your load function will receive as its first argument the
* path component in the position of the wildcard; load functions may also be
* passed additional arguments (see "load arguments" in the return value
* section below). For example, your module could register path
* 'my-module/%mymodule_abc/edit':
* @code
* $items['my-module/%mymodule_abc/edit'] = array(
* 'page callback' => 'mymodule_abc_edit',
* 'page arguments' => array(1),
* );
* @endcode
* When path 'my-module/123/edit' is requested, your load function
* mymodule_abc_load() will be invoked with the argument '123', and should
* load and return an "abc" object with internal id 123:
* @code
* function mymodule_abc_load($abc_id) {
* return db_query("SELECT * FROM {mymodule_abc} WHERE abc_id = :abc_id", array(':abc_id' => $abc_id))->fetchObject();
* }
* @endcode
* This 'abc' object will then be passed into the page callback function
* mymodule_abc_edit() to replace the integer 1 in the page arguments.
*
* You can also make groups of menu items to be rendered (by default) as tabs
* on a page. To do that, first create one menu item of type MENU_NORMAL_ITEM,
* with your chosen path, such as 'foo'. Then duplicate that menu item, using a
* subdirectory path, such as 'foo/tab1', and changing the type to
* MENU_DEFAULT_LOCAL_TASK to make it the default tab for the group. Then add
* the additional tab items, with paths such as "foo/tab2" etc., with type
* MENU_LOCAL_TASK. Example:
* @code
* // Make "Foo settings" appear on the admin Config page
* $items['admin/config/foo'] = array(
* 'title' => 'Foo settings',
* 'type' => MENU_NORMAL_ITEM,
* // Page callback, etc. need to be added here.
* );
* // Make "Global settings" the main tab on the "Foo settings" page
* $items['admin/config/foo/global'] = array(
* 'title' => 'Global settings',
* 'type' => MENU_DEFAULT_LOCAL_TASK,
* // Access callback, page callback, and theme callback will be inherited
* // from 'admin/config/foo', if not specified here to override.
* );
* // Make an additional tab called "Node settings" on "Foo settings"
* $items['admin/config/foo/node'] = array(
* 'title' => 'Node settings',
* 'type' => MENU_LOCAL_TASK,
* // Page callback and theme callback will be inherited from
* // 'admin/config/foo', if not specified here to override.
* // Need to add access callback or access arguments.
* );
* @endcode
*
* @return
* An array of menu items. Each menu item has a key corresponding to the
* Drupal path being registered. The corresponding array value is an
* associative array that may contain the following key-value pairs:
* - "title": Required. The untranslated title of the menu item.
* - "title callback": Function to generate the title; defaults to t(). * If you require only the raw string to be output, set this to FALSE.
* - "title arguments": Arguments to send to t() or your custom callback,
* with path component substitution as described above.
* - "description": The untranslated description of the menu item.
* - "page callback": The function to call to display a web page when the user
* visits the path. If omitted, the parent menu item's callback will be used
* instead.
* - "page arguments": An array of arguments to pass to the page callback
* function, with path component substitution as described above.
* - "delivery callback": The function to call to package the result of the
* page callback function and send it to the browser. Defaults to
* drupal_deliver_html_page() unless a value is inherited from a parent menu
* item. Note that this function is called even if the access checks fail,
* so any custom delivery callback function should take that into account.
* See drupal_deliver_html_page() for an example.
* - "access callback": A function returning TRUE if the user has access
* rights to this menu item, and FALSE if not. It can also be a boolean
* constant instead of a function, and you can also use numeric values
* (will be cast to boolean). Defaults to user_access() unless a value is
* inherited from the parent menu item; only MENU_DEFAULT_LOCAL_TASK items
* can inherit access callbacks. To use the user_access() default callback,
* you must specify the permission to check as 'access arguments' (see
* below).
* - "access arguments": An array of arguments to pass to the access callback
* function, with path component substitution as described above. If the
* access callback is inherited (see above), the access arguments will be
* inherited with it, unless overridden in the child menu item.
* - "theme callback": (optional) A function returning the machine-readable
* name of the theme that will be used to render the page. If not provided,
* the value will be inherited from a parent menu item. If there is no
* theme callback, or if the function does not return the name of a current
* active theme on the site, the theme for this page will be determined by
* either hook_custom_theme() or the default theme instead. As a general
* rule, the use of theme callback functions should be limited to pages
* whose functionality is very closely tied to a particular theme, since
* they can only be overridden by modules which specifically target those
* pages in hook_menu_alter(). Modules implementing more generic theme
* switching functionality (for example, a module which allows the theme to
* be set dynamically based on the current user's role) should use
* hook_custom_theme() instead.
* - "theme arguments": An array of arguments to pass to the theme callback
* function, with path component substitution as described above.
* - "file": A file that will be included before the page callback is called;
* this allows page callback functions to be in separate files. The file
* should be relative to the implementing module's directory unless
* otherwise specified by the "file path" option. Does not apply to other
* callbacks (only page callback).
* - "file path": The path to the directory containing the file specified in
* "file". This defaults to the path to the module implementing the hook.
* - "load arguments": An array of arguments to be passed to each of the
* wildcard object loaders in the path, after the path argument itself.
* For example, if a module registers path node/%node/revisions/%/view
* with load arguments set to array(3), the '%node' in the path indicates
* that the loader function node_load() will be called with the second
* path component as the first argument. The 3 in the load arguments
* indicates that the fourth path component will also be passed to
* node_load() (numbering of path components starts at zero). So, if path
* node/12/revisions/29/view is requested, node_load(12, 29) will be called.
* There are also two "magic" values that can be used in load arguments.
* "%index" indicates the index of the wildcard path component. "%map"
* indicates the path components as an array. For example, if a module
* registers for several paths of the form 'user/%user_category/edit/*', all
* of them can use the same load function user_category_load(), by setting
* the load arguments to array('%map', '%index'). For instance, if the user
* is editing category 'foo' by requesting path 'user/32/edit/foo', the load
* function user_category_load() will be called with 32 as its first
* argument, the array ('user', 32, 'edit', 'foo') as the map argument,
* and 1 as the index argument (because %user_category is the second path
* component and numbering starts at zero). user_category_load() can then
* use these values to extract the information that 'foo' is the category * being requested.
* - "weight": An integer that determines the relative position of items in
* the menu; higher-weighted items sink. Defaults to 0. Menu items with the
* same weight are ordered alphabetically.
* - "menu_name": Optional. Set this to a custom menu if you don't want your
* item to be placed in Navigation.
* - "context": (optional) Defines the context a tab may appear in. By
* default, all tabs are only displayed as local tasks when being rendered
* in a page context. All tabs that should be accessible as contextual links
* in page region containers outside of the parent menu item's primary page
* context should be registered using one of the following contexts:
* - MENU_CONTEXT_PAGE: (default) The tab is displayed as local task for the
* page context only.
* - MENU_CONTEXT_INLINE: The tab is displayed as contextual link outside of
* the primary page context only.
* Contexts can be combined. For example, to display a tab both on a page
* and inline, a menu router item may specify:
* @code
* 'context' => MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE,
* @endcode
* - "tab_parent": For local task menu items, the path of the task's parent
* item; defaults to the same path without the last component (e.g., the
* default parent for 'admin/people/create' is 'admin/people').
* - "tab_root": For local task menu items, the path of the closest non-tab
* item; same default as "tab_parent".
* - "position": Position of the block ('left' or 'right') on the system
* administration page for this item.
* - "type": A bitmask of flags describing properties of the menu item.
* Many shortcut bitmasks are provided as constants in menu.inc:
* - MENU_NORMAL_ITEM: Normal menu items show up in the menu tree and can be
* moved/hidden by the administrator.
* - MENU_CALLBACK: Callbacks simply register a path so that the correct
* information is generated when the path is accessed.
* - MENU_SUGGESTED_ITEM: Modules may "suggest" menu items that the
* administrator may enable.
* - MENU_LOCAL_ACTION: Local actions are menu items that describe actions
* on the parent item such as adding a new user or block, and are
* rendered in the action-links list in your theme.
* - MENU_LOCAL_TASK: Local tasks are menu items that describe different
* displays of data, and are generally rendered as tabs.
* - MENU_DEFAULT_LOCAL_TASK: Every set of local tasks should provide one
* "default" task, which should display the same page as the parent item.
* If the "type" element is omitted, MENU_NORMAL_ITEM is assumed.
* - "options": An array of options to be passed to l() when generating a link
* from this menu item.
*
* For a detailed usage example, see page_example.module.
* For comprehensive documentation on the menu system, see
* http://drupal.org/node/102338.
*/
function hook_menu() {
$items['blog'] = array(
'title' => 'blogs',
'page callback' => 'blog_page',
'access arguments' => array('access content'),
'type' => MENU_SUGGESTED_ITEM,
);
$items['blog/feed'] = array(
'title' => 'RSS feed',
'page callback' => 'blog_feed',
'access arguments' => array('access content'),
'type' => MENU_CALLBACK,
);
return $items;
}
/**
* Alter the data being saved to the {menu_router} table after hook_menu is invoked.
* * This hook is invoked by menu_router_build(). The menu definitions are passed
* in by reference. Each element of the $items array is one item returned
* by a module from hook_menu. Additional items may be added, or existing items
* altered.
*
* @param $items
* Associative array of menu router definitions returned from hook_menu().
*/
function hook_menu_alter(&$items) {
// Example - disable the page at node/add
$items['node/add']['access callback'] = FALSE;
}
/**
* Alter the data being saved to the {menu_links} table by menu_link_save().
*
* @param $item
* Associative array defining a menu link as passed into menu_link_save().
*
* @see hook_translated_menu_link_alter()
*/
function hook_menu_link_alter(&$item) {
// Make all new admin links hidden (a.k.a disabled).
if (strpos($item['link_path'], 'admin') === 0 && empty($item['mlid'])) {
$item['hidden'] = 1;
}
// Flag a link to be altered by hook_translated_menu_link_alter().
if ($item['link_path'] == 'devel/cache/clear') {
$item['options']['alter'] = TRUE;
}
// Flag a link to be altered by hook_translated_menu_link_alter(), but only
// if it is derived from a menu router item; i.e., do not alter a custom
// menu link pointing to the same path that has been created by a user.
if ($item['link_path'] == 'user' && $item['module'] == 'system') {
$item['options']['alter'] = TRUE;
}
}
/**
* Alter a menu link after it has been translated and before it is rendered.
*
* This hook is invoked from _menu_link_translate() after a menu link has been
* translated; i.e., after dynamic path argument placeholders (%) have been
* replaced with actual values, the user access to the link's target page has
* been checked, and the link has been localized. It is only invoked if
* $item['options']['alter'] has been set to a non-empty value (e.g., TRUE).
* This flag should be set using hook_menu_link_alter().
*
* Implementations of this hook are able to alter any property of the menu link.
* For example, this hook may be used to add a page-specific query string to all
* menu links, or hide a certain link by setting:
* @code
* 'hidden' => 1,
* @endcode
*
* @param $item
* Associative array defining a menu link after _menu_link_translate()
* @param $map
* Associative array containing the menu $map (path parts and/or objects).
*
* @see hook_menu_link_alter()
*/
function hook_translated_menu_link_alter(&$item, $map) {
if ($item['href'] == 'devel/cache/clear') {
$item['localized_options']['query'] = drupal_get_destination();
}
}
/**
* Inform modules that a menu link has been created. *
* This hook is used to notify modules that menu items have been
* created. Contributed modules may use the information to perform
* actions based on the information entered into the menu system.
*
* @param $link
* Associative array defining a menu link as passed into menu_link_save().
*
* @see hook_menu_link_update()
* @see hook_menu_link_delete()
*/
function hook_menu_link_insert($link) {
// In our sample case, we track menu items as editing sections
// of the site. These are stored in our table as 'disabled' items.
$record['mlid'] = $link['mlid'];
$record['menu_name'] = $link['menu_name'];
$record['status'] = 0;
drupal_write_record('menu_example', $record);
}
/**
* Inform modules that a menu link has been updated.
*
* This hook is used to notify modules that menu items have been
* updated. Contributed modules may use the information to perform
* actions based on the information entered into the menu system.
*
* @param $link
* Associative array defining a menu link as passed into menu_link_save().
*
* @see hook_menu_link_insert()
* @see hook_menu_link_delete()
*/
function hook_menu_link_update($link) {
// If the parent menu has changed, update our record.
$menu_name = db_result(db_query("SELECT mlid, menu_name, status FROM {menu_example} WHERE mlid = :mlid", array(':mlid' => $link['mlid'])));
if ($menu_name != $link['menu_name']) {
db_update('menu_example')
->fields(array('menu_name' => $link['menu_name']))
->condition('mlid', $link['mlid'])
->execute();
}
}
/**
* Inform modules that a menu link has been deleted.
*
* This hook is used to notify modules that menu items have been
* deleted. Contributed modules may use the information to perform
* actions based on the information entered into the menu system.
*
* @param $link
* Associative array defining a menu link as passed into menu_link_save().
*
* @see hook_menu_link_insert()
* @see hook_menu_link_update()
*/
function hook_menu_link_delete($link) {
// Delete the record from our table.
db_delete('menu_example')
->condition('mlid', $link['mlid'])
->execute();
}
/**
* Alter tabs and actions displayed on the page before they are rendered.
*
* This hook is invoked by menu_local_tasks(). The system-determined tabs and
* actions are passed in by reference. Additional tabs or actions may be added,
* or existing items altered. *
* Each tab or action is an associative array containing:
* - #theme: The theme function to use to render.
* - #link: An associative array containing:
* - title: The localized title of the link.
* - href: The system path to link to.
* - localized_options: An array of options to pass to url().
* - #active: Whether the link should be marked as 'active'.
*
* @param $data
* An associative array containing:
* - actions: An associative array containing:
* - count: The amount of actions determined by the menu system, which can
* be ignored.
* - output: A list of of actions, each one being an associative array
* as described above.
* - tabs: An indexed array (list) of tab levels (up to 2 levels), each
* containing an associative array:
* - count: The amount of tabs determined by the menu system. This value
* does not need to be altered if there is more than one tab.
* - output: A list of of tabs, each one being an associative array as
* described above.
* @param $router_item
* The menu system router item of the page.
* @param $root_path
* The path to the root item for this set of tabs.
*/
function hook_menu_local_tasks_alter(&$data, $router_item, $root_path) {
// Add an action linking to node/add to all pages.
$data['actions']['output'][] = array(
'#theme' => 'menu_local_task',
'#link' => array(
'title' => t('Add new content'),
'href' => 'node/add',
'localized_options' => array(
'attributes' => array(
'title' => t('Add new content'),
),
),
),
);
// Add a tab linking to node/add to all pages.
$data['tabs'][0]['output'][] = array(
'#theme' => 'menu_local_task',
'#link' => array(
'title' => t('Example tab'),
'href' => 'node/add',
'localized_options' => array(
'attributes' => array(
'title' => t('Add new content'),
),
),
),
// Define whether this link is active. This can be omitted for
// implementations that add links to pages outside of the current page
// context.
'#active' => ($router_item['path'] == $root_path),
);
}
/**
* Alter links in the active trail before it is rendered as the breadcrumb.
*
* This hook is invoked by menu_get_active_breadcrumb() and allows alteration
* of the breadcrumb links for the current page, which may be preferred instead
* of setting a custom breadcrumb via drupal_set_breadcrumb().
*
* Implementations should take into account that menu_get_active_breadcrumb()
* subsequently performs the following adjustments to the active trail *after* * this hook has been invoked:
* - The last link in $active_trail is removed, if its 'href' is identical to
* the 'href' of $item. This happens, because the breadcrumb normally does
* not contain a link to the current page.
* - The (second to) last link in $active_trail is removed, if the current $item
* is a MENU_DEFAULT_LOCAL_TASK. This happens in order to do not show a link
* to the current page, when being on the path for the default local task;
* e.g. when being on the path node/%/view, the breadcrumb should not contain
* a link to node/%.
*
* Each link in the active trail must contain:
* - title: The localized title of the link.
* - href: The system path to link to.
* - localized_options: An array of options to pass to url().
*
* @param $active_trail
* An array containing breadcrumb links for the current page.
* @param $item
* The menu router item of the current page.
*
* @see drupal_set_breadcrumb()
* @see menu_get_active_breadcrumb()
* @see menu_get_active_trail()
* @see menu_set_active_trail()
*/
function hook_menu_breadcrumb_alter(&$active_trail, $item) {
// Always display a link to the current page by duplicating the last link in
// the active trail. This means that menu_get_active_breadcrumb() will remove
// the last link (for the current page), but since it is added once more here,
// it will appear.
if (!drupal_is_front_page()) {
$end = end($active_trail);
if ($item['href'] == $end['href']) {
$active_trail[] = $end;
}
}
}
/**
* Alter contextual links before they are rendered.
*
* This hook is invoked by menu_contextual_links(). The system-determined
* contextual links are passed in by reference. Additional links may be added
* or existing links can be altered.
*
* Each contextual link must at least contain:
* - title: The localized title of the link.
* - href: The system path to link to.
* - localized_options: An array of options to pass to url().
*
* @param $links
* An associative array containing contextual links for the given $root_path,
* as described above. The array keys are used to build CSS class names for
* contextual links and must therefore be unique for each set of contextual
* links.
* @param $router_item
* The menu router item belonging to the $root_path being requested.
* @param $root_path
* The (parent) path that has been requested to build contextual links for.
* This is a normalized path, which means that an originally passed path of
* 'node/123' became 'node/%'.
*
* @see hook_contextual_links_view_alter()
* @see menu_contextual_links()
* @see hook_menu()
* @see contextual_preprocess()
*/
function hook_menu_contextual_links_alter(&$links, $router_item, $root_path) {
// Add a link to all contextual links for nodes.
if ($root_path == 'node/%') { $links['foo'] = array(
'title' => t('Do fu'),
'href' => 'foo/do',
'localized_options' => array(
'query' => array(
'foo' => 'bar',
),
),
);
}
}
/**
* Perform alterations before a page is rendered.
*
* Use this hook when you want to remove or alter elements at the page
* level, or add elements at the page level that depend on an other module's
* elements (this hook runs after hook_page_build().
*
* If you are making changes to entities such as forms, menus, or user
* profiles, use those objects' native alter hooks instead (hook_form_alter(),
* for example).
*
* The $page array contains top level elements for each block region:
* @code
* $page['page_top']
* $page['header']
* $page['sidebar_first']
* $page['content']
* $page['sidebar_second']
* $page['page_bottom']
* @endcode
*
* The 'content' element contains the main content of the current page, and its
* structure will vary depending on what module is responsible for building the
* page. Some legacy modules may not return structured content at all: their
* pre-rendered markup will be located in $page['content']['main']['#markup'].
*
* Pages built by Drupal's core Node and Blog modules use a standard structure:
*
* @code
* // Node body.
* $page['content']['system_main']['nodes'][$nid]['body']
* // Array of links attached to the node (add comments, read more).
* $page['content']['system_main']['nodes'][$nid]['links']
* // The node object itself.
* $page['content']['system_main']['nodes'][$nid]['#node']
* // The results pager.
* $page['content']['system_main']['pager']
* @endcode
*
* Blocks may be referenced by their module/delta pair within a region:
* @code
* // The login block in the first sidebar region.
* $page['sidebar_first']['user_login']['#block'];
* @endcode
*
* @param $page
* Nested array of renderable elements that make up the page.
*
* @see hook_page_build()
* @see drupal_render_page()
*/
function hook_page_alter(&$page) {
// Add help text to the user login block.
$page['sidebar_first']['user_login']['help'] = array(
'#weight' => -10,
'#markup' => t('To post comments or add new content, you first have to log in.'),
);
}
/**
* Perform alterations before a form is rendered.
*
* One popular use of this hook is to add form elements to the node form. When
* altering a node form, the node object can be accessed at $form['#node'].
*
* Note that instead of hook_form_alter(), which is called for all forms, you
* can also use hook_form_FORM_ID_alter() to alter a specific form. For each
* module (in system weight order) the general form alter hook implementation
* is invoked first, then the form ID specific alter implementation is called.
* After all module hook implementations are invoked, the hook_form_alter()
* implementations from themes are invoked in the same manner.
*
* @param $form
* Nested array of form elements that comprise the form.
* @param $form_state
* A keyed array containing the current state of the form. The arguments
* that drupal_get_form() was originally called with are available in the
* array $form_state['build_info']['args'].
* @param $form_id
* String representing the name of the form itself. Typically this is the
* name of the function that generated the form.
*
* @see hook_form_FORM_ID_alter()
*/
function hook_form_alter(&$form, &$form_state, $form_id) {
if (isset($form['type']) && $form['type']['#value'] . '_node_settings' == $form_id) {
$form['workflow']['upload_' . $form['type']['#value']] = array(
'#type' => 'radios',
'#title' => t('Attachments'),
'#default_value' => variable_get('upload_' . $form['type']['#value'], 1),
'#options' => array(t('Disabled'), t('Enabled')),
);
}
}
/**
* Provide a form-specific alteration instead of the global hook_form_alter().
*
* Modules can implement hook_form_FORM_ID_alter() to modify a specific form,
* rather than implementing hook_form_alter() and checking the form ID, or
* using long switch statements to alter multiple forms.
*
* @param $form
* Nested array of form elements that comprise the form.
* @param $form_state
* A keyed array containing the current state of the form. The arguments
* that drupal_get_form() was originally called with are available in the
* array $form_state['build_info']['args'].
* @param $form_id
* String representing the name of the form itself. Typically this is the
* name of the function that generated the form.
*
* @see hook_form_alter()
* @see drupal_prepare_form()
*/
function hook_form_FORM_ID_alter(&$form, &$form_state, $form_id) {
// Modification for the form with the given form ID goes here. For example, if
// FORM_ID is "user_register_form" this code would run only on the user
// registration form.
// Add a checkbox to registration form about agreeing to terms of use.
$form['terms_of_use'] = array(
'#type' => 'checkbox',
'#title' => t("I agree with the website's terms and conditions."),
'#required' => TRUE,
);
}
/**
* Provide a form-specific alteration for shared forms.
*
* Modules can implement hook_form_BASE_FORM_ID_alter() to modify a specific
* form belonging to multiple form_ids, rather than implementing
* hook_form_alter() and checking for conditions that would identify the
* shared form constructor.
*
* Examples for such forms are node_form() or comment_form().
*
* Note that this hook fires after hook_form_FORM_ID_alter() and before
* hook_form_alter().
*
* @param $form
* Nested array of form elements that comprise the form.
* @param $form_state
* A keyed array containing the current state of the form.
* @param $form_id
* String representing the name of the form itself. Typically this is the
* name of the function that generated the form.
*
* @see hook_form_FORM_ID_alter()
* @see drupal_prepare_form()
*/
function hook_form_BASE_FORM_ID_alter(&$form, &$form_state, $form_id) {
// Modification for the form with the given BASE_FORM_ID goes here. For
// example, if BASE_FORM_ID is "node_form", this code would run on every
// node form, regardless of node type.
// Add a checkbox to the node form about agreeing to terms of use.
$form['terms_of_use'] = array(
'#type' => 'checkbox',
'#title' => t("I agree with the website's terms and conditions."),
'#required' => TRUE,
);
}
/**
* Map form_ids to form builder functions.
*
* By default, when drupal_get_form() is called, the system will look for a
* function with the same name as the form ID, and use that function to build
* the form. This hook allows you to override that behavior in two ways.
*
* First, you can use this hook to tell the form system to use a different
* function to build certain forms in your module; this is often used to define
* a form "factory" function that is used to build several similar forms. In
* this case, your hook implementation will likely ignore all of the input
* arguments. See node_forms() for an example of this.
*
* Second, you could use this hook to define how to build a form with a
* dynamically-generated form ID. In this case, you would need to verify that
* the $form_id input matched your module's format for dynamically-generated
* form IDs, and if so, act appropriately.
*
* @param $form_id
* The unique string identifying the desired form.
* @param $args
* An array containing the original arguments provided to drupal_get_form()
* or drupal_form_submit(). These are always passed to the form builder and
* do not have to be specified manually in 'callback arguments'.
*
* @return
* An associative array whose keys define form_ids and whose values are an
* associative array defining the following keys:
* - callback: The name of the form builder function to invoke.
* - callback arguments: (optional) Additional arguments to pass to the
* function defined in 'callback', which are prepended to $args.
* - wrapper_callback: (optional) The name of a form builder function to
* invoke before the form builder defined in 'callback' is invoked. This * wrapper callback may prepopulate the $form array with form elements,
* which will then be already contained in the $form that is passed on to
* the form builder defined in 'callback'. For example, a wrapper callback
* could setup wizard-alike form buttons that are the same for a variety of
* forms that belong to the wizard, which all share the same wrapper
* callback.
*/
function hook_forms($form_id, $args) {
// Simply reroute the (non-existing) $form_id 'mymodule_first_form' to
// 'mymodule_main_form'.
$forms['mymodule_first_form'] = array(
'callback' => 'mymodule_main_form',
);
// Reroute the $form_id and prepend an additional argument that gets passed to
// the 'mymodule_main_form' form builder function.
$forms['mymodule_second_form'] = array(
'callback' => 'mymodule_main_form',
'callback arguments' => array('some parameter'),
);
// Reroute the $form_id, but invoke the form builder function
// 'mymodule_main_form_wrapper' first, so we can prepopulate the $form array
// that is passed to the actual form builder 'mymodule_main_form'.
$forms['mymodule_wrapped_form'] = array(
'callback' => 'mymodule_main_form',
'wrapper_callback' => 'mymodule_main_form_wrapper',
);
return $forms;
}
/**
* Perform setup tasks. See also, hook_init.
*
* This hook is run at the beginning of the page request. It is typically
* used to set up global parameters which are needed later in the request.
*
* Only use this hook if your code must run even for cached page views.This hook
* is called before modules or most include files are loaded into memory.
* It happens while Drupal is still in bootstrap mode.
*/
function hook_boot() {
// we need user_access() in the shutdown function. make sure it gets loaded
drupal_load('module', 'user');
drupal_register_shutdown_function('devel_shutdown');
}
/**
* Perform setup tasks. See also, hook_boot.
*
* This hook is run at the beginning of the page request. It is typically
* used to set up global parameters which are needed later in the request.
* when this hook is called, all modules are already loaded in memory.
*
* This hook is not run on cached pages.
*
* To add CSS or JS that should be present on all pages, modules should not
* implement this hook, but declare these files in their .info file.
*/
function hook_init() {
// Since this file should only be loaded on the front page, it cannot be
// declared in the info file.
if (drupal_is_front_page()) {
drupal_add_css(drupal_get_path('module', 'foo') . '/foo.css');
}
}
/**
* Define image toolkits provided by this module. *
* The file which includes each toolkit's functions must be declared as part of
* the files array in the module .info file so that the registry will find and
* parse it.
*
* The toolkit's functions must be named image_toolkitname_operation().
* where the operation may be:
* - 'load': Required. See image_gd_load() for usage.
* - 'save': Required. See image_gd_save() for usage.
* - 'settings': Optional. See image_gd_settings() for usage.
* - 'resize': Optional. See image_gd_resize() for usage.
* - 'rotate': Optional. See image_gd_rotate() for usage.
* - 'crop': Optional. See image_gd_crop() for usage.
* - 'desaturate': Optional. See image_gd_desaturate() for usage.
*
* @return
* An array with the toolkit name as keys and sub-arrays with these keys:
* - 'title': A string with the toolkit's title.
* - 'available': A Boolean value to indicate that the toolkit is operating
* properly, e.g. all required libraries exist.
*
* @see system_image_toolkits()
*/
function hook_image_toolkits() {
return array(
'working' => array(
'title' => t('A toolkit that works.'),
'available' => TRUE,
),
'broken' => array(
'title' => t('A toolkit that is "broken" and will not be listed.'),
'available' => FALSE,
),
);
}
/**
* Alter an email message created with the drupal_mail() function.
*
* hook_mail_alter() allows modification of email messages created and sent
* with drupal_mail(). Usage examples include adding and/or changing message
* text, message fields, and message headers.
*
* Email messages sent using functions other than drupal_mail() will not
* invoke hook_mail_alter(). For example, a contributed module directly
* calling the drupal_mail_system()->mail() or PHP mail() function
* will not invoke this hook. All core modules use drupal_mail() for
* messaging, it is best practice but not mandatory in contributed modules.
*
* @param $message
* An array containing the message data. Keys in this array include:
* - 'id':
* The drupal_mail() id of the message. Look at module source code or
* drupal_mail() for possible id values.
* - 'to':
* The address or addresses the message will be sent to. The
* formatting of this string must comply with RFC 2822.
* - 'from':
* The address the message will be marked as being from, which is
* either a custom address or the site-wide default email address.
* - 'subject':
* Subject of the email to be sent. This must not contain any newline
* characters, or the email may not be sent properly.
* - 'body':
* An array of strings containing the message text. The message body is
* created by concatenating the individual array strings into a single text
* string using "\n\n" as a separator.
* - 'headers':
* Associative array containing mail headers, such as From, Sender,
* MIME-Version, Content-Type, etc. * - 'params':
* An array of optional parameters supplied by the caller of drupal_mail()
* that is used to build the message before hook_mail_alter() is invoked.
* - 'language':
* The language object used to build the message before hook_mail_alter()
* is invoked.
*
* @see drupal_mail()
*/
function hook_mail_alter(&$message) {
if ($message['id'] == 'modulename_messagekey') {
$message['body'][] = "--\nMail sent out from " . variable_get('sitename', t('Drupal'));
}
}
/**
* Alter the registry of modules implementing a hook.
*
* This hook is invoked during module_implements(). A module may implement this
* hook in order to reorder the implementing modules, which are otherwise
* ordered by the module's system weight.
*
* @param &$implementations
* An array keyed by the module's name. The value of each item corresponds
* to a $group, which is usually FALSE, unless the implementation is in a
* file named $module.$group.inc.
* @param $hook
* The name of the module hook being implemented.
*/
function hook_module_implements_alter(&$implementations, $hook) {
if ($hook == 'rdf_mapping') {
// Move my_module_rdf_mapping() to the end of the list. module_implements()
// iterates through $implementations with a foreach loop which PHP iterates
// in the order that the items were added, so to move an item to the end of
// the array, we remove it and then add it.
$group = $implementations['my_module'];
unset($implementations['my_module']);
$implementations['my_module'] = $group;
}
}
/**
* Alter the information parsed from module and theme .info files
*
* This hook is invoked in _system_rebuild_module_data() and in
* _system_rebuild_theme_data(). A module may implement this hook in order to
* add to or alter the data generated by reading the .info file with
* drupal_parse_info_file().
*
* @param &$info
* The .info file contents, passed by reference so that it can be altered.
* @param $file
* Full information about the module or theme, including $file->name, and
* $file->filename
* @param $type
* Either 'module' or 'theme', depending on the type of .info file that was
* passed.
*/
function hook_system_info_alter(&$info, $file, $type) {
// Only fill this in if the .info file does not define a 'datestamp'.
if (empty($info['datestamp'])) {
$info['datestamp'] = filemtime($file->filename);
}
}
/**
* Define user permissions.
*
* This hook can supply permissions that the module defines, so that they
* can be selected on the user permissions page and used to grant or restrict * access to actions the module performs.
*
* Permissions are checked using user_access().
*
* For a detailed usage example, see page_example.module.
*
* @return
* An array whose keys are permission names and whose corresponding values
* are arrays containing the following key-value pairs:
* - title: The human-readable name of the permission, to be shown on the
* permission administration page. This should be wrapped in the t()
* function so it can be translated.
* - description: (optional) A description of what the permission does. This
* should be wrapped in the t() function so it can be translated.
* - restrict access: (optional) A boolean which can be set to TRUE to
* indicate that site administrators should restrict access to this
* permission to trusted users. This should be used for permissions that
* have inherent security risks across a variety of potential use cases
* (for example, the "administer filters" and "bypass node access"
* permissions provided by Drupal core). When set to TRUE, a standard
* warning message defined in user_admin_permissions() will be associated
* with the permission and displayed with it on the permission
* administration page. Defaults to FALSE.
* - warning: (optional) A translated warning message to display on the
* permission administration page. This warning overrides the automatic
* warning generated by 'restrict access' being set to TRUE.
*/
function hook_permission() {
return array(
'administer my module' => array(
'title' => t('Administer my module'),
'description' => t('Perform administration tasks for my module.'),
),
);
}
/**
* Register a module (or theme's) theme implementations.
*
* The following parameters are all optional.
*
* @param array $existing
* An array of existing implementations that may be used for override
* purposes. This is primarily useful for themes that may wish to examine
* existing implementations to extract data (such as arguments) so that
* it may properly register its own, higher priority implementations.
* @param $type
* Whether a theme, module, etc. is being processed. This is primarily useful
* so that themes tell if they are the actual theme being called or a parent
* theme. May be one of:
* - 'module': A module is being checked for theme implementations.
* - 'base_theme_engine': A theme engine is being checked for a theme that is
* a parent of the actual theme being used.
* - 'theme_engine': A theme engine is being checked for the actual theme
* being used.
* - 'base_theme': A base theme is being checked for theme implementations.
* - 'theme': The actual theme in use is being checked.
* @param $theme
* The actual name of theme, module, etc. that is being being processed.
* @param $path
* The directory path of the theme or module, so that it doesn't need to be
* looked up.
*
* @return array
* An associative array of theme hook information. The keys on the outer
* array are the internal names of the hooks, and the values are arrays
* containing information about the hook. Each array may contain the
* following elements:
* - variables: (required if "render element" not present) An array of
* variables that this theme hook uses. This value allows the theme layer to * properly utilize templates. Each array key represents the name of the
* variable and the value will be used as the default value if it is not
* given when theme() is called. Template implementations receive these
* arguments as variables in the template file. Function implementations
* are passed this array data in the $variables parameter.
* - render element: (required if "variables" not present) A string that is
* the name of the sole renderable element to pass to the theme function.
* The string represents the name of the "variable" that will hold the
* renderable array inside any optional preprocess or process functions.
* Cannot be used with the "variables" item; only one or the other, not
* both, can be present in a hook's info array.
* - file: The file the implementation resides in. This file will be included
* prior to the theme being rendered, to make sure that the function or
* preprocess function (as needed) is actually loaded; this makes it
* possible to split theme functions out into separate files quite easily.
* - path: Override the path of the file to be used. Ordinarily the module or
* theme path will be used, but if the file will not be in the default path,
* include it here. This path should be relative to the Drupal root
* directory.
* - template: If specified, this theme implementation is a template, and this
* is the template file without an extension. Do not put .tpl.php on this
* file; that extension will be added automatically by the default rendering
* engine (which is PHPTemplate). If 'path', above, is specified, the
* template should also be in this path.
* - function: If specified, this will be the function name to invoke for this
* implementation. If neither file nor function is specified, a default
* function name will be assumed. For example, if a module registers
* the 'node' theme hook, 'theme_node' will be assigned to its function.
* If the chameleon theme registers the node hook, it will be assigned
* 'chameleon_node' as its function.
* - pattern: A regular expression pattern to be used to allow this theme
* implementation to have a dynamic name. The convention is to use __ to
* differentiate the dynamic portion of the theme. For example, to allow
* forums to be themed individually, the pattern might be: 'forum__'. Then,
* when the forum is themed, call:
* @code
* theme(array('forum__' . $tid, 'forum'), $forum)
* @endcode
* - preprocess functions: A list of functions used to preprocess this data.
* Ordinarily this won't be used; it's automatically filled in. By default,
* for a module this will be filled in as template_preprocess_HOOK. For
* a theme this will be filled in as phptemplate_preprocess and
* phptemplate_preprocess_HOOK as well as themename_preprocess and
* themename_preprocess_HOOK.
* - override preprocess functions: Set to TRUE when a theme does NOT want the
* standard preprocess functions to run. This can be used to give a theme
* FULL control over how variables are set. For example, if a theme wants
* total control over how certain variables in the page.tpl.php are set,
* this can be set to true. Please keep in mind that when this is used
* by a theme, that theme becomes responsible for making sure necessary
* variables are set.
* - type: (automatically derived) Where the theme hook is defined:
* 'module', 'theme_engine', or 'theme'.
* - theme path: (automatically derived) The directory path of the theme or
* module, so that it doesn't need to be looked up.
*/
function hook_theme($existing, $type, $theme, $path) {
return array(
'forum_display' => array(
'variables' => array('forums' => NULL, 'topics' => NULL, 'parents' => NULL, 'tid' => NULL, 'sortby' => NULL, 'forum_per_page' => NULL),
),
'forum_list' => array(
'variables' => array('forums' => NULL, 'parents' => NULL, 'tid' => NULL),
),
'forum_topic_list' => array(
'variables' => array('tid' => NULL, 'topics' => NULL, 'sortby' => NULL, 'forum_per_page' => NULL),
),
'forum_icon' => array(
'variables' => array('new_posts' => NULL, 'num_posts' => 0, 'comment_mode' => 0, 'sticky' => 0),
), 'status_report' => array(
'render element' => 'requirements',
'file' => 'system.admin.inc',
),
'system_date_time_settings' => array(
'render element' => 'form',
'file' => 'system.admin.inc',
),
);
}
/**
* Alter the theme registry information returned from hook_theme().
*
* The theme registry stores information about all available theme hooks,
* including which callback functions those hooks will call when triggered,
* what template files are exposed by these hooks, and so on.
*
* Note that this hook is only executed as the theme cache is re-built.
* Changes here will not be visible until the next cache clear.
*
* The $theme_registry array is keyed by theme hook name, and contains the
* information returned from hook_theme(), as well as additional properties
* added by _theme_process_registry().
*
* For example:
* @code
* $theme_registry['user_profile'] = array(
* 'variables' => array(
* 'account' => NULL,
* ),
* 'template' => 'modules/user/user-profile',
* 'file' => 'modules/user/user.pages.inc',
* 'type' => 'module',
* 'theme path' => 'modules/user',
* 'preprocess functions' => array(
* 0 => 'template_preprocess',
* 1 => 'template_preprocess_user_profile',
* ),
* );
* @endcode
*
* @param $theme_registry
* The entire cache of theme registry information, post-processing.
*
* @see hook_theme()
* @see _theme_process_registry()
*/
function hook_theme_registry_alter(&$theme_registry) {
// Kill the next/previous forum topic navigation links.
foreach ($theme_registry['forum_topic_navigation']['preprocess functions'] as $key => $value) {
if ($value = 'template_preprocess_forum_topic_navigation') {
unset($theme_registry['forum_topic_navigation']['preprocess functions'][$key]);
}
}
}
/**
* Return the machine-readable name of the theme to use for the current page.
*
* This hook can be used to dynamically set the theme for the current page
* request. It should be used by modules which need to override the theme
* based on dynamic conditions (for example, a module which allows the theme to
* be set based on the current user's role). The return value of this hook will
* be used on all pages except those which have a valid per-page or per-section
* theme set via a theme callback function in hook_menu(); the themes on those
* pages can only be overridden using hook_menu_alter().
*
* Since only one theme can be used at a time, the last (i.e., highest
* weighted) module which returns a valid theme name from this hook will * prevail.
*
* @return
* The machine-readable name of the theme that should be used for the current
* page request. The value returned from this function will only have an
* effect if it corresponds to a currently-active theme on the site.
*/
function hook_custom_theme() {
// Allow the user to request a particular theme via a query parameter.
if (isset($_GET['theme'])) {
return $_GET['theme'];
}
}
/**
* Register XML-RPC callbacks.
*
* This hook lets a module register callback functions to be called when
* particular XML-RPC methods are invoked by a client.
*
* @return
* An array which maps XML-RPC methods to Drupal functions. Each array
* element is either a pair of method => function or an array with four
* entries:
* - The XML-RPC method name (for example, module.function).
* - The Drupal callback function (for example, module_function).
* - The method signature is an array of XML-RPC types. The first element
* of this array is the type of return value and then you should write a
* list of the types of the parameters. XML-RPC types are the following
* (See the types at http://www.xmlrpc.com/spec):
* - "boolean": 0 (false) or 1 (true).
* - "double": a floating point number (for example, -12.214).
* - "int": a integer number (for example, -12).
* - "array": an array without keys (for example, array(1, 2, 3)).
* - "struct": an associative array or an object (for example,
* array('one' => 1, 'two' => 2)).
* - "date": when you return a date, then you may either return a
* timestamp (time(), mktime() etc.) or an ISO8601 timestamp. When
* date is specified as an input parameter, then you get an object,
* which is described in the function xmlrpc_date
* - "base64": a string containing binary data, automatically
* encoded/decoded automatically.
* - "string": anything else, typically a string.
* - A descriptive help string, enclosed in a t() function for translation
* purposes.
* Both forms are shown in the example.
*/
function hook_xmlrpc() {
return array(
'drupal.login' => 'drupal_login',
array(
'drupal.site.ping',
'drupal_directory_ping',
array('boolean', 'string', 'string', 'string', 'string', 'string'),
t('Handling ping request'))
);
}
/**
* Alters the definition of XML-RPC methods before they are called.
*
* This hook allows modules to modify the callback definition of declared
* XML-RPC methods, right before they are invoked by a client. Methods may be
* added, or existing methods may be altered.
*
* Note that hook_xmlrpc() supports two distinct and incompatible formats to
* define a callback, so care must be taken when altering other methods.
*
* @param $methods
* An asssociative array of method callback definitions, as returned from * hook_xmlrpc() implementations.
*
* @see hook_xmlrpc()
* @see xmlrpc_server()
*/
function hook_xmlrpc_alter(&$methods) {
// Directly change a simple method.
$methods['drupal.login'] = 'mymodule_login';
// Alter complex definitions.
foreach ($methods as $key => &$method) {
// Skip simple method definitions.
if (!is_int($key)) {
continue;
}
// Perform the wanted manipulation.
if ($method[0] == 'drupal.site.ping') {
$method[1] = 'mymodule_directory_ping';
}
}
}
/**
* Log an event message
*
* This hook allows modules to route log events to custom destinations, such as
* SMS, Email, pager, syslog, ...etc.
*
* @param $log_entry
* An associative array containing the following keys:
* - type: The type of message for this entry. For contributed modules, this is
* normally the module name. Do not use 'debug', use severity WATCHDOG_DEBUG instead.
* - user: The user object for the user who was logged in when the event happened.
* - request_uri: The Request URI for the page the event happened in.
* - referer: The page that referred the use to the page where the event occurred.
* - ip: The IP address where the request for the page came from.
* - timestamp: The UNIX timestamp of the date/time the event occurred
* - severity: One of the following values as defined in RFC 3164 http://www.faqs.org/rfcs/rfc3164.html
* WATCHDOG_EMERGENCY Emergency: system is unusable
* WATCHDOG_ALERT Alert: action must be taken immediately
* WATCHDOG_CRITICAL Critical: critical conditions
* WATCHDOG_ERROR Error: error conditions
* WATCHDOG_WARNING Warning: warning conditions
* WATCHDOG_NOTICE Notice: normal but significant condition
* WATCHDOG_INFO Informational: informational messages
* WATCHDOG_DEBUG Debug: debug-level messages
* - link: an optional link provided by the module that called the watchdog() function.
* - message: The text of the message to be logged.
*/
function hook_watchdog(array $log_entry) {
global $base_url, $language;
$severity_list = array(
WATCHDOG_EMERGENCY => t('Emergency'),
WATCHDOG_ALERT => t('Alert'),
WATCHDOG_CRITICAL => t('Critical'),
WATCHDOG_ERROR => t('Error'),
WATCHDOG_WARNING => t('Warning'),
WATCHDOG_NOTICE => t('Notice'),
WATCHDOG_INFO => t('Info'),
WATCHDOG_DEBUG => t('Debug'),
);
$to = 'someone@example.com';
$params = array();
$params['subject'] = t('[@site_name] @severity_desc: Alert from your web site', array(
'@site_name' => variable_get('site_name', 'Drupal'),
'@severity_desc' => $severity_list[$log_entry['severity']],
));
$params['message'] = "\nSite: @base_url";
$params['message'] .= "\nSeverity: (@severity) @severity_desc";
$params['message'] .= "\nTimestamp: @timestamp";
$params['message'] .= "\nType: @type";
$params['message'] .= "\nIP Address: @ip";
$params['message'] .= "\nRequest URI: @request_uri";
$params['message'] .= "\nReferrer URI: @referer_uri";
$params['message'] .= "\nUser: (@uid) @name";
$params['message'] .= "\nLink: @link";
$params['message'] .= "\nMessage: \n\n@message";
$params['message'] = t($params['message'], array(
'@base_url' => $base_url,
'@severity' => $log_entry['severity'],
'@severity_desc' => $severity_list[$log_entry['severity']],
'@timestamp' => format_date($log_entry['timestamp']),
'@type' => $log_entry['type'],
'@ip' => $log_entry['ip'],
'@request_uri' => $log_entry['request_uri'],
'@referer_uri' => $log_entry['referer'],
'@uid' => $log_entry['user']->uid,
'@name' => $log_entry['user']->name,
'@link' => strip_tags($log_entry['link']),
'@message' => strip_tags($log_entry['message']),
));
drupal_mail('emaillog', 'entry', $to, $language, $params);
}
/**
* Prepare a message based on parameters; called from drupal_mail().
*
* Note that hook_mail(), unlike hook_mail_alter(), is only called on the
* $module argument to drupal_mail(), not all modules.
*
* @param $key
* An identifier of the mail.
* @param $message
* An array to be filled in. Elements in this array include:
* - id: An ID to identify the mail sent. Look at module source code
* or drupal_mail() for possible id values.
* - to: The address or addresses the message will be sent to. The
* formatting of this string must comply with RFC 2822.
* - subject: Subject of the e-mail to be sent. This must not contain any
* newline characters, or the mail may not be sent properly. drupal_mail()
* sets this to an empty string when the hook is invoked.
* - body: An array of lines containing the message to be sent. Drupal will
* format the correct line endings for you. drupal_mail() sets this to an
* empty array when the hook is invoked.
* - from: The address the message will be marked as being from, which is
* set by drupal_mail() to either a custom address or the site-wide
* default email address when the hook is invoked.
* - headers: Associative array containing mail headers, such as From,
* Sender, MIME-Version, Content-Type, etc. drupal_mail() pre-fills
* several headers in this array.
* @param $params
* An array of parameters supplied by the caller of drupal_mail().
*/
function hook_mail($key, &$message, $params) {
$account = $params['account'];
$context = $params['context'];
$variables = array(
'%site_name' => variable_get('site_name', 'Drupal'),
'%username' => format_username($account),
);
if ($context['hook'] == 'taxonomy') {
$entity = $params['entity'];
$vocabulary = taxonomy_vocabulary_load($entity->vid);
$variables += array(
'%term_name' => $entity->name, '%term_description' => $entity->description,
'%term_id' => $entity->tid,
'%vocabulary_name' => $vocabulary->name,
'%vocabulary_description' => $vocabulary->description,
'%vocabulary_id' => $vocabulary->vid,
);
}
// Node-based variable translation is only available if we have a node.
if (isset($params['node'])) {
$node = $params['node'];
$variables += array(
'%uid' => $node->uid,
'%node_url' => url('node/' . $node->nid, array('absolute' => TRUE)),
'%node_type' => node_type_get_name($node),
'%title' => $node->title,
'%teaser' => $node->teaser,
'%body' => $node->body,
);
}
$subject = strtr($context['subject'], $variables);
$body = strtr($context['message'], $variables);
$message['subject'] .= str_replace(array("\r", "\n"), '', $subject);
$message['body'][] = drupal_html_to_text($body);
}
/**
* Add a list of cache tables to be cleared.
*
* This hook allows your module to add cache table names to the list of cache
* tables that will be cleared by the Clear button on the Performance page or
* whenever drupal_flush_all_caches is invoked.
*
* @return
* An array of cache table names.
*
* @see drupal_flush_all_caches()
*/
function hook_flush_caches() {
return array('cache_example');
}
/**
* Perform necessary actions after modules are installed.
*
* This function differs from hook_install() in that it gives all other modules
* a chance to perform actions when a module is installed, whereas
* hook_install() is only called on the module actually being installed. See
* module_enable() for a detailed description of the order in which install and
* enable hooks are invoked.
*
* @param $modules
* An array of the installed modules.
*
* @see module_enable()
* @see hook_modules_enabled()
* @see hook_install()
*/
function hook_modules_installed($modules) {
if (in_array('lousy_module', $modules)) {
variable_set('lousy_module_conflicting_variable', FALSE);
}
}
/**
* Perform necessary actions after modules are enabled.
*
* This function differs from hook_enable() in that it gives all other modules a
* chance to perform actions when modules are enabled, whereas hook_enable() is
* only called on the module actually being enabled. See module_enable() for a * detailed description of the order in which install and enable hooks are
* invoked.
*
* @param $modules
* An array of the enabled modules.
*
* @see hook_enable()
* @see hook_modules_installed()
* @see module_enable()
*/
function hook_modules_enabled($modules) {
if (in_array('lousy_module', $modules)) {
drupal_set_message(t('mymodule is not compatible with lousy_module'), 'error');
mymodule_disable_functionality();
}
}
/**
* Perform necessary actions after modules are disabled.
*
* This function differs from hook_disable() in that it gives all other modules
* a chance to perform actions when modules are disabled, whereas hook_disable()
* is only called on the module actually being disabled.
*
* @param $modules
* An array of the disabled modules.
*
* @see hook_disable()
* @see hook_modules_uninstalled()
*/
function hook_modules_disabled($modules) {
if (in_array('lousy_module', $modules)) {
mymodule_enable_functionality();
}
}
/**
* Perform necessary actions after modules are uninstalled.
*
* This function differs from hook_uninstall() in that it gives all other
* modules a chance to perform actions when a module is uninstalled, whereas
* hook_uninstall() is only called on the module actually being uninstalled.
*
* It is recommended that you implement this hook if your module stores
* data that may have been set by other modules.
*
* @param $modules
* An array of the uninstalled modules.
*
* @see hook_uninstall()
* @see hook_modules_disabled()
*/
function hook_modules_uninstalled($modules) {
foreach ($modules as $module) {
db_delete('mymodule_table')
->condition('module', $module)
->execute();
}
mymodule_cache_rebuild();
}
/**
* Registers PHP stream wrapper implementations associated with a module.
*
* Provide a facility for managing and querying user-defined stream wrappers
* in PHP. PHP's internal stream_get_wrappers() doesn't return the class
* registered to handle a stream, which we need to be able to find the handler
* for class instantiation.
*
* If a module registers a scheme that is already registered with PHP, it will * be unregistered and replaced with the specified class.
*
* @return
* A nested array, keyed first by scheme name ("public" for "public://"),
* then keyed by the following values:
* - 'name' A short string to name the wrapper.
* - 'class' A string specifying the PHP class that implements the
* DrupalStreamWrapperInterface interface.
* - 'description' A string with a short description of what the wrapper does.
* - 'type' (Optional) A bitmask of flags indicating what type of streams this
* wrapper will access - local or remote, readable and/or writeable, etc.
* Many shortcut constants are defined in stream_wrappers.inc. Defaults to
* STREAM_WRAPPERS_NORMAL which includes all of these bit flags:
* - STREAM_WRAPPERS_READ
* - STREAM_WRAPPERS_WRITE
* - STREAM_WRAPPERS_VISIBLE
*
* @see file_get_stream_wrappers()
* @see hook_stream_wrappers_alter()
* @see system_stream_wrappers()
*/
function hook_stream_wrappers() {
return array(
'public' => array(
'name' => t('Public files'),
'class' => 'DrupalPublicStreamWrapper',
'description' => t('Public local files served by the webserver.'),
'type' => STREAM_WRAPPERS_LOCAL_NORMAL,
),
'private' => array(
'name' => t('Private files'),
'class' => 'DrupalPrivateStreamWrapper',
'description' => t('Private local files served by Drupal.'),
'type' => STREAM_WRAPPERS_LOCAL_NORMAL,
),
'temp' => array(
'name' => t('Temporary files'),
'class' => 'DrupalTempStreamWrapper',
'description' => t('Temporary local files for upload and previews.'),
'type' => STREAM_WRAPPERS_LOCAL_HIDDEN,
),
'cdn' => array(
'name' => t('Content delivery network files'),
'class' => 'MyModuleCDNStreamWrapper',
'description' => t('Files served by a content delivery network.'),
// 'type' can be omitted to use the default of STREAM_WRAPPERS_NORMAL
),
'youtube' => array(
'name' => t('YouTube video'),
'class' => 'MyModuleYouTubeStreamWrapper',
'description' => t('Video streamed from YouTube.'),
// A module implementing YouTube integration may decide to support using
// the YouTube API for uploading video, but here, we assume that this
// particular module only supports playing YouTube video.
'type' => STREAM_WRAPPERS_READ_VISIBLE,
),
);
}
/**
* Alters the list of PHP stream wrapper implementations.
*
* @see file_get_stream_wrappers()
* @see hook_stream_wrappers()
*/
function hook_stream_wrappers_alter(&$wrappers) {
// Change the name of private files to reflect the performance.
$wrappers['private']['name'] = t('Slow files');
}
/**
* Load additional information into file objects.
*
* file_load_multiple() calls this hook to allow modules to load
* additional information into each file.
*
* @param $files
* An array of file objects, indexed by fid.
*
* @see file_load_multiple()
* @see upload_file_load()
*/
function hook_file_load($files) {
// Add the upload specific data into the file object.
$result = db_query('SELECT * FROM {upload} u WHERE u.fid IN (:fids)', array(':fids' => array_keys($files)))->fetchAll(PDO::FETCH_ASSOC);
foreach ($result as $record) {
foreach ($record as $key => $value) {
$files[$record['fid']]->$key = $value;
}
}
}
/**
* Check that files meet a given criteria.
*
* This hook lets modules perform additional validation on files. They're able
* to report a failure by returning one or more error messages.
*
* @param $file
* The file object being validated.
* @return
* An array of error messages. If there are no problems with the file return
* an empty array.
*
* @see file_validate()
*/
function hook_file_validate($file) {
$errors = array();
if (empty($file->filename)) {
$errors[] = t("The file's name is empty. Please give a name to the file.");
}
if (strlen($file->filename) > 255) {
$errors[] = t("The file's name exceeds the 255 characters limit. Please rename the file and try again.");
}
return $errors;
}
/**
* Act on a file being inserted or updated.
*
* This hook is called when a file has been added to the database. The hook
* doesn't distinguish between files created as a result of a copy or those
* created by an upload.
*
* @param $file
* The file that has just been created.
*
* @see file_save()
*/
function hook_file_presave($file) {
// Change the file timestamp to an hour prior.
$file->timestamp -= 3600;
}
/**
* Respond to a file being added.
*
* This hook is called before a file has been added to the database. The hook * doesn't distinguish between files created as a result of a copy or those
* created by an upload.
*
* @param $file
* The file that is about to be saved.
*
* @see file_save()
*/
function hook_file_insert($file) {
}
/**
* Respond to a file being updated.
*
* This hook is called when file_save() is called on an existing file.
*
* @param $file
* The file that has just been updated.
*
* @see file_save()
*/
function hook_file_update($file) {
}
/**
* Respond to a file that has been copied.
*
* @param $file
* The newly copied file object.
* @param $source
* The original file before the copy.
*
* @see file_copy()
*/
function hook_file_copy($file, $source) {
}
/**
* Respond to a file that has been moved.
*
* @param $file
* The updated file object after the move.
* @param $source
* The original file object before the move.
*
* @see file_move()
*/
function hook_file_move($file, $source) {
}
/**
* Respond to a file being deleted.
*
* @param $file
* The file that has just been deleted.
*
* @see file_delete()
* @see upload_file_delete()
*/
function hook_file_delete($file) {
// Delete all information associated with the file.
db_delete('upload')->condition('fid', $file->fid)->execute();
}
/**
* Control access to private file downloads and specify HTTP headers. *
* This hook allows modules enforce permissions on file downloads when the
* private file download method is selected. Modules can also provide headers
* to specify information like the file's name or MIME type.
*
* @param $uri
* The URI of the file.
* @return
* If the user does not have permission to access the file, return -1. If the
* user has permission, return an array with the appropriate headers. If the
* file is not controlled by the current module, the return value should be
* NULL.
*
* @see file_download()
* @see upload_file_download()
*/
function hook_file_download($uri) {
// Check if the file is controlled by the current module.
if (!file_prepare_directory($uri)) {
$uri = FALSE;
}
$result = db_query("SELECT f.* FROM {file_managed} f INNER JOIN {upload} u ON f.fid = u.fid WHERE uri = :uri", array('uri' => $uri));
foreach ($result as $file) {
if (!user_access('view uploaded files')) {
return -1;
}
return array(
'Content-Type' => $file->filemime,
'Content-Length' => $file->filesize,
);
}
}
/**
* Alter the URL to a file.
*
* This hook is called from file_create_url(), and is called fairly
* frequently (10+ times per page), depending on how many files there are in a
* given page.
* If CSS and JS aggregation are disabled, this can become very frequently
* (50+ times per page) so performance is critical.
*
* This function should alter the URI, if it wants to rewrite the file URL.
*
* @param $uri
* The URI to a file for which we need an external URL, or the path to a
* shipped file.
*/
function hook_file_url_alter(&$uri) {
global $user;
// User 1 will always see the local file in this example.
if ($user->uid == 1) {
return;
}
$cdn1 = 'http://cdn1.example.com';
$cdn2 = 'http://cdn2.example.com';
$cdn_extensions = array('css', 'js', 'gif', 'jpg', 'jpeg', 'png');
// Most CDNs don't support private file transfers without a lot of hassle,
// so don't support this in the common case.
$schemes = array('public');
$scheme = file_uri_scheme($uri);
// Only serve shipped files and public created files from the CDN.
if (!$scheme || in_array($scheme, $schemes)) {
// Shipped files.
if (!$scheme) { $path = $uri;
}
// Public created files.
else {
$wrapper = file_stream_wrapper_get_instance_by_scheme($scheme);
$path = $wrapper->getDirectoryPath() . '/' . file_uri_target($uri);
}
// Clean up Windows paths.
$path = str_replace('\\', '/', $path);
// Serve files with one of the CDN extensions from CDN 1, all others from
// CDN 2.
$pathinfo = pathinfo($path);
if (isset($pathinfo['extension']) && in_array($pathinfo['extension'], $cdn_extensions)) {
$uri = $cdn1 . '/' . $path;
}
else {
$uri = $cdn2 . '/' . $path;
}
}
}
/**
* Check installation requirements and do status reporting.
*
* This hook has two closely related uses, determined by the $phase argument:
* checking installation requirements ($phase == 'install')
* and status reporting ($phase == 'runtime').
*
* Note that this hook, like all others dealing with installation and updates,
* must reside in a module_name.install file, or it will not properly abort
* the installation of the module if a critical requirement is missing.
*
* During the 'install' phase, modules can for example assert that
* library or server versions are available or sufficient.
* Note that the installation of a module can happen during installation of
* Drupal itself (by install.php) with an installation profile or later by hand.
* As a consequence, install-time requirements must be checked without access
* to the full Drupal API, because it is not available during install.php.
* For localization you should for example use $t = get_t() to
* retrieve the appropriate localization function name (t() or st()).
* If a requirement has a severity of REQUIREMENT_ERROR, install.php will abort
* or at least the module will not install.
* Other severity levels have no effect on the installation.
* Module dependencies do not belong to these installation requirements,
* but should be defined in the module's .info file.
*
* The 'runtime' phase is not limited to pure installation requirements
* but can also be used for more general status information like maintenance
* tasks and security issues.
* The returned 'requirements' will be listed on the status report in the
* administration section, with indication of the severity level.
* Moreover, any requirement with a severity of REQUIREMENT_ERROR severity will
* result in a notice on the the administration overview page.
*
* @param $phase
* The phase in which requirements are checked:
* - install: The module is being installed.
* - update: The module is enabled and update.php is run.
* - runtime: The runtime requirements are being checked and shown on the
* status report page.
*
* @return
* A keyed array of requirements. Each requirement is itself an array with
* the following items:
* - title: The name of the requirement.
* - value: The current value (e.g., version, time, level, etc). During
* install phase, this should only be used for version numbers, do not set
* it if not applicable. * - description: The description of the requirement/status.
* - severity: The requirement's result/severity level, one of:
* - REQUIREMENT_INFO: For info only.
* - REQUIREMENT_OK: The requirement is satisfied.
* - REQUIREMENT_WARNING: The requirement failed with a warning.
* - REQUIREMENT_ERROR: The requirement failed with an error.
*/
function hook_requirements($phase) {
$requirements = array();
// Ensure translations don't break at install time
$t = get_t();
// Report Drupal version
if ($phase == 'runtime') {
$requirements['drupal'] = array(
'title' => $t('Drupal'),
'value' => VERSION,
'severity' => REQUIREMENT_INFO
);
}
// Test PHP version
$requirements['php'] = array(
'title' => $t('PHP'),
'value' => ($phase == 'runtime') ? l(phpversion(), 'admin/logs/status/php') : phpversion(),
);
if (version_compare(phpversion(), DRUPAL_MINIMUM_PHP) < 0) {
$requirements['php']['description'] = $t('Your PHP installation is too old. Drupal requires at least PHP %version.', array('%version' => DRUPAL_MINIMUM_PHP));
$requirements['php']['severity'] = REQUIREMENT_ERROR;
}
// Report cron status
if ($phase == 'runtime') {
$cron_last = variable_get('cron_last');
if (is_numeric($cron_last)) {
$requirements['cron']['value'] = $t('Last run !time ago', array('!time' => format_interval(REQUEST_TIME - $cron_last)));
}
else {
$requirements['cron'] = array(
'description' => $t('Cron has not run. It appears cron jobs have not been setup on your system. Check the help pages for <a href="@url">configuring cron jobs</a>.', array('@url' => 'http://drupal.org/cron')),
'severity' => REQUIREMENT_ERROR,
'value' => $t('Never run'),
);
}
$requirements['cron']['description'] .= ' ' . t('You can <a href="@cron">run cron manually</a>.', array('@cron' => url('admin/logs/status/run-cron')));
$requirements['cron']['title'] = $t('Cron maintenance tasks');
}
return $requirements;
}
/**
* Define the current version of the database schema.
*
* A Drupal schema definition is an array structure representing one or
* more tables and their related keys and indexes. A schema is defined by
* hook_schema() which must live in your module's .install file.
*
* By implementing hook_schema() and specifying the tables your module
* declares, you can easily create and drop these tables on all
* supported database engines. You don't have to deal with the
* different SQL dialects for table creation and alteration of the
* supported database engines.
*
* See the Schema API Handbook at http://drupal.org/node/146843 for
* details on schema definition structures.
* * @return
* A schema definition structure array. For each element of the
* array, the key is a table name and the value is a table structure
* definition.
*
* @ingroup schemaapi
*/
function hook_schema() {
$schema['node'] = array(
// example (partial) specification for table "node"
'description' => 'The base table for nodes.',
'fields' => array(
'nid' => array(
'description' => 'The primary identifier for a node.',
'type' => 'serial',
'unsigned' => TRUE,
'not null' => TRUE),
'vid' => array(
'description' => 'The current {node_revision}.vid version identifier.',
'type' => 'int',
'unsigned' => TRUE,
'not null' => TRUE,
'default' => 0),
'type' => array(
'description' => 'The {node_type} of this node.',
'type' => 'varchar',
'length' => 32,
'not null' => TRUE,
'default' => ''),
'title' => array(
'description' => 'The title of this node, always treated as non-markup plain text.',
'type' => 'varchar',
'length' => 255,
'not null' => TRUE,
'default' => ''),
),
'indexes' => array(
'node_changed' => array('changed'),
'node_created' => array('created'),
),
'unique keys' => array(
'nid_vid' => array('nid', 'vid'),
'vid' => array('vid')
),
'foreign keys' => array(
'node_revision' => array(
'table' => 'node_revision',
'columns' => array('vid' => 'vid'),
),
'node_author' => array(
'table' => 'users',
'columns' => array('uid' => 'uid')
),
),
'primary key' => array('nid'),
);
return $schema;
}
/**
* Perform alterations to existing database schemas.
*
* When a module modifies the database structure of another module (by
* changing, adding or removing fields, keys or indexes), it should
* implement hook_schema_alter() to update the default $schema to take its
* changes into account.
*
* See hook_schema() for details on the schema definition structure.
*
* @param $schema * Nested array describing the schemas for all modules.
*/
function hook_schema_alter(&$schema) {
// Add field to existing schema.
$schema['users']['fields']['timezone_id'] = array(
'type' => 'int',
'not null' => TRUE,
'default' => 0,
'description' => 'Per-user timezone configuration.',
);
}
/**
* Perform alterations to a structured query.
*
* Structured (aka dynamic) queries that have tags associated may be altered by any module
* before the query is executed.
*
* @param $query
* A Query object describing the composite parts of a SQL query.
*
* @see hook_query_TAG_alter()
* @see node_query_node_access_alter()
* @see QueryAlterableInterface
* @see SelectQueryInterface
*/
function hook_query_alter(QueryAlterableInterface $query) {
if ($query->hasTag('micro_limit')) {
$query->range(0, 2);
}
}
/**
* Perform alterations to a structured query for a given tag.
*
* @param $query
* An Query object describing the composite parts of a SQL query.
*
* @see hook_query_alter()
* @see node_query_node_access_alter()
* @see QueryAlterableInterface
* @see SelectQueryInterface
*/
function hook_query_TAG_alter(QueryAlterableInterface $query) {
// Skip the extra expensive alterations if site has no node access control modules.
if (!node_access_view_all_nodes()) {
// Prevent duplicates records.
$query->distinct();
// The recognized operations are 'view', 'update', 'delete'.
if (!$op = $query->getMetaData('op')) {
$op = 'view';
}
// Skip the extra joins and conditions for node admins.
if (!user_access('bypass node access')) {
// The node_access table has the access grants for any given node.
$access_alias = $query->join('node_access', 'na', '%alias.nid = n.nid');
$or = db_or();
// If any grant exists for the specified user, then user has access to the node for the specified operation.
foreach (node_access_grants($op, $query->getMetaData('account')) as $realm => $gids) {
foreach ($gids as $gid) {
$or->condition(db_and()
->condition($access_alias . '.gid', $gid)
->condition($access_alias . '.realm', $realm)
);
}
}
if (count($or->conditions())) {
$query->condition($or);
}
$query->condition($access_alias . 'grant_' . $op, 1, '>=');
}
}
}
/**
* Perform setup tasks when the module is installed.
*
* If the module implements hook_schema(), the database tables will
* be created before this hook is fired.
*
* This hook will only be called the first time a module is enabled or after it
* is re-enabled after being uninstalled. The module's schema version will be
* set to the module's greatest numbered update hook. Because of this, anytime a
* hook_update_N() is added to the module, this function needs to be updated to
* reflect the current version of the database schema.
*
* See the Schema API documentation at
* @link http://drupal.org/node/146843 http://drupal.org/node/146843 @endlink
* for details on hook_schema and how database tables are defined.
*
* Note that since this function is called from a full bootstrap, all functions
* (including those in modules enabled by the current page request) are
* available when this hook is called. Use cases could be displaying a user
* message, or calling a module function necessary for initial setup, etc.
*
* Please be sure that anything added or modified in this function that can
* be removed during uninstall should be removed with hook_uninstall().
*
* @see hook_schema()
* @see module_enable()
* @see hook_enable()
* @see hook_disable()
* @see hook_uninstall()
* @see hook_modules_installed()
*/
function hook_install() {
// Populate the default {node_access} record.
db_insert('node_access')
->fields(array(
'nid' => 0,
'gid' => 0,
'realm' => 'all',
'grant_view' => 1,
'grant_update' => 0,
'grant_delete' => 0,
))
->execute();
}
/**
* Perform a single update.
*
* For each patch which requires a database change add a new hook_update_N()
* which will be called by update.php. The database updates are numbered
* sequentially according to the version of Drupal you are compatible with.
*
* Schema updates should adhere to the Schema API:
* @link http://drupal.org/node/150215 http://drupal.org/node/150215 @endlink
*
* Database updates consist of 3 parts:
* - 1 digit for Drupal core compatibility
* - 1 digit for your module's major release version (e.g. is this the 5.x-1.* (1) or 5.x-2.* (2) series of your module?)
* - 2 digits for sequential counting starting with 00
*
* The 2nd digit should be 0 for initial porting of your module to a new Drupal
* core API.
*
* Examples: * - mymodule_update_5200()
* - This is the first update to get the database ready to run mymodule 5.x-2.*.
* - mymodule_update_6000()
* - This is the required update for mymodule to run with Drupal core API 6.x.
* - mymodule_update_6100()
* - This is the first update to get the database ready to run mymodule 6.x-1.*.
* - mymodule_update_6200()
* - This is the first update to get the database ready to run mymodule 6.x-2.*.
* Users can directly update from 5.x-2.* to 6.x-2.* and they get all 60XX
* and 62XX updates, but not 61XX updates, because those reside in the
* 6.x-1.x branch only.
*
* A good rule of thumb is to remove updates older than two major releases of
* Drupal. See hook_update_last_removed() to notify Drupal about the removals.
*
* Never renumber update functions.
*
* Further information about releases and release numbers:
* - @link http://drupal.org/handbook/version-info http://drupal.org/handbook/version-info @endlink
* - @link http://drupal.org/node/93999 http://drupal.org/node/93999 @endlink (Overview of contributions branches and tags)
* - @link http://drupal.org/handbook/cvs/releases http://drupal.org/handbook/cvs/releases @endlink
*
* Implementations of this hook should be placed in a mymodule.install file in
* the same directory as mymodule.module. Drupal core's updates are implemented
* using the system module as a name and stored in database/updates.inc.
*
* If your update task is potentially time-consuming, you'll need to implement a
* multipass update to avoid PHP timeouts. Multipass updates use the $sandbox
* parameter provided by the batch API (normally, $context['sandbox']) to store
* information between successive calls, and the $sandbox['#finished'] value
* to provide feedback regarding completion level.
*
* See the batch operations page for more information on how to use the batch API:
* @link http://drupal.org/node/180528 http://drupal.org/node/180528 @endlink
*
* @param $sandbox
* Stores information for multipass updates. See above for more information.
*
* @throws DrupalUpdateException, PDOException
* In case of error, update hooks should throw an instance of DrupalUpdateException
* with a meaningful message for the user. If a database query fails for whatever
* reason, it will throw a PDOException.
*
* @return
* Optionally update hooks may return a translated string that will be displayed
* to the user. If no message is returned, no message will be presented to the
* user.
*/
function hook_update_N(&$sandbox) {
// For non-multipass updates, the signature can simply be;
// function hook_update_N() {
// For most updates, the following is sufficient.
db_add_field('mytable1', 'newcol', array('type' => 'int', 'not null' => TRUE, 'description' => 'My new integer column.'));
// However, for more complex operations that may take a long time,
// you may hook into Batch API as in the following example.
// Update 3 users at a time to have an exclamation point after their names.
// (They're really happy that we can do batch API in this hook!)
if (!isset($sandbox['progress'])) {
$sandbox['progress'] = 0;
$sandbox['current_uid'] = 0;
// We'll -1 to disregard the uid 0...
$sandbox['max'] = db_query('SELECT COUNT(DISTINCT uid) FROM {users}')->fetchField() - 1;
}
$users = db_select('users', 'u')
->fields('u', array('uid', 'name'))
->condition('uid', $sandbox['current_uid'], '>') ->range(0, 3)
->orderBy('uid', 'ASC')
->execute();
foreach ($users as $user) {
$user->name .= '!';
db_update('users')
->fields(array('name' => $user->name))
->condition('uid', $user->uid)
->execute();
$sandbox['progress']++;
$sandbox['current_uid'] = $user->uid;
}
$sandbox['#finished'] = empty($sandbox['max']) ? 1 : ($sandbox['progress'] / $sandbox['max']);
// To display a message to the user when the update is completed, return it.
// If you do not want to display a completion message, simply return nothing.
return t('The update did what it was supposed to do.');
// In case of an error, simply throw an exception with an error message.
throw new DrupalUpdateException('Something went wrong; here is what you should do.');
}
/**
* Return an array of information about module update dependencies.
*
* This can be used to indicate update functions from other modules that your
* module's update functions depend on, or vice versa. It is used by the update
* system to determine the appropriate order in which updates should be run, as
* well as to search for missing dependencies.
*
* Implementations of this hook should be placed in a mymodule.install file in
* the same directory as mymodule.module.
*
* @return
* A multidimensional array containing information about the module update
* dependencies. The first two levels of keys represent the module and update
* number (respectively) for which information is being returned, and the
* value is an array of information about that update's dependencies. Within
* this array, each key represents a module, and each value represents the
* number of an update function within that module. In the event that your
* update function depends on more than one update from a particular module,
* you should always list the highest numbered one here (since updates within
* a given module always run in numerical order).
*
* @see update_resolve_dependencies()
* @see hook_update_N()
*/
function hook_update_dependencies() {
// Indicate that the mymodule_update_7000() function provided by this module
// must run after the another_module_update_7002() function provided by the
// 'another_module' module.
$dependencies['mymodule'][7000] = array(
'another_module' => 7002,
);
// Indicate that the mymodule_update_7001() function provided by this module
// must run before the yet_another_module_update_7004() function provided by
// the 'yet_another_module' module. (Note that declaring dependencies in this
// direction should be done only in rare situations, since it can lead to the
// following problem: If a site has already run the yet_another_module
// module's database updates before it updates its codebase to pick up the
// newest mymodule code, then the dependency declared here will be ignored.)
$dependencies['yet_another_module'][7004] = array(
'mymodule' => 7001,
);
return $dependencies;
}
/**
* Return a number which is no longer available as hook_update_N().
*
* If you remove some update functions from your mymodule.install file, you
* should notify Drupal of those missing functions. This way, Drupal can
* ensure that no update is accidentally skipped.
*
* Implementations of this hook should be placed in a mymodule.install file in
* the same directory as mymodule.module.
*
* @return
* An integer, corresponding to hook_update_N() which has been removed from
* mymodule.install.
*
* @see hook_update_N()
*/
function hook_update_last_removed() {
// We've removed the 5.x-1.x version of mymodule, including database updates.
// The next update function is mymodule_update_5200().
return 5103;
}
/**
* Remove any information that the module sets.
*
* The information that the module should remove includes:
* - variables that the module has set using variable_set() or system_settings_form()
* - modifications to existing tables
*
* The module should not remove its entry from the {system} table. Database
* tables defined by hook_schema() will be removed automatically.
*
* The uninstall hook will fire when the module gets uninstalled but before the
* module's database tables are removed, allowing your module to query its own
* tables during this routine.
*
* @see hook_install()
* @see hook_schema()
* @see hook_disable()
* @see hook_modules_uninstalled()
*/
function hook_uninstall() {
variable_del('upload_file_types');
}
/**
* Perform necessary actions after module is enabled.
*
* The hook is called every time the module is enabled.
*
* @see module_enable()
* @see hook_install()
* @see hook_modules_enabled()
*/
function hook_enable() {
mymodule_cache_rebuild();
}
/**
* Perform necessary actions before module is disabled.
*
* The hook is called every time the module is disabled.
*
* @see hook_uninstall()
* @see hook_modules_disabled()
*/
function hook_disable() {
mymodule_cache_rebuild();
}
/**
* Perform necessary alterations to the list of files parsed by the registry.
*
* Modules can manually modify the list of files before the registry parses
* them. The $modules array provides the .info file information, which includes
* the list of files registered to each module. Any files in the list can then
* be added to the list of files that the registry will parse, or modify
* attributes of a file.
*
* A necessary alteration made by the core SimpleTest module is to force .test
* files provided by disabled modules into the list of files parsed by the
* registry.
*
* @param $files
* List of files to be parsed by the registry. The list will contain
* files found in each enabled module's info file and the core includes
* directory. The array is keyed by the file path and contains an array of
* the related module's name and weight as used internally by
* _registry_update() and related functions.
*
* For example:
* @code
* $files["modules/system/system.module"] = array(
* 'module' => 'system',
* 'weight' => 0,
* );
* @endcode
* @param $modules
* An array containing all module information stored in the {system} table.
* Each element of the array also contains the module's .info file
* information in the property 'info'. An additional 'dir' property has been
* added to the module information which provides the path to the directory
* in which the module resides. The example shows how to take advantage of
* both properties.
*
* @see _registry_update()
* @see simpletest_test_get_all()
*/
function hook_registry_files_alter(&$files, $modules) {
foreach ($modules as $module) {
// Only add test files for disabled modules, as enabled modules should
// already include any test files they provide.
if (!$module->status) {
$dir = $module->dir;
foreach ($module->info['files'] as $file) {
if (substr($file, -5) == '.test') {
$files["$dir/$file"] = array('module' => $module->name, 'weight' => $module->weight);
}
}
}
}
}
/**
* Return an array of tasks to be performed by an installation profile.
*
* Any tasks you define here will be run, in order, after the installer has
* finished the site configuration step but before it has moved on to the
* final import of languages and the end of the installation. You can have any
* number of custom tasks to perform during this phase.
*
* Each task you define here corresponds to a callback function which you must
* separately define and which is called when your task is run. This function
* will receive the global installation state variable, $install_state, as
* input, and has the opportunity to access or modify any of its settings. See
* the install_state_defaults() function in the installer for the list of
* $install_state settings used by Drupal core.
*
* At the end of your task function, you can indicate that you want the
* installer to pause and display a page to the user by returning any themed * output that should be displayed on that page (but see below for tasks that
* use the form API or batch API; the return values of these task functions are
* handled differently). You should also use drupal_set_title() within the task
* callback function to set a custom page title. For some tasks, however, you
* may want to simply do some processing and pass control to the next task
* without ending the page request; to indicate this, simply do not send back
* a return value from your task function at all. This can be used, for
* example, by installation profiles that need to configure certain site
* settings in the database without obtaining any input from the user.
*
* The task function is treated specially if it defines a form or requires
* batch processing; in that case, you should return either the form API
* definition or batch API array, as appropriate. See below for more
* information on the 'type' key that you must define in the task definition
* to inform the installer that your task falls into one of those two
* categories. It is important to use these APIs directly, since the installer
* may be run non-interactively (for example, via a command line script), all
* in one page request; in that case, the installer will automatically take
* care of submitting forms and processing batches correctly for both types of
* installations. You can inspect the $install_state['interactive'] boolean to
* see whether or not the current installation is interactive, if you need
* access to this information.
*
* Remember that a user installing Drupal interactively will be able to reload
* an installation page multiple times, so you should use variable_set() and
* variable_get() if you are collecting any data that you need to store and
* inspect later. It is important to remove any temporary variables using
* variable_del() before your last task has completed and control is handed
* back to the installer.
*
* @return
* A keyed array of tasks the profile will perform during the final stage of
* the installation. Each key represents the name of a function (usually a
* function defined by this profile, although that is not strictly required)
* that is called when that task is run. The values are associative arrays
* containing the following key-value pairs (all of which are optional):
* - 'display_name'
* The human-readable name of the task. This will be displayed to the
* user while the installer is running, along with a list of other tasks
* that are being run. Leave this unset to prevent the task from
* appearing in the list.
* - 'display'
* This is a boolean which can be used to provide finer-grained control
* over whether or not the task will display. This is mostly useful for
* tasks that are intended to display only under certain conditions; for
* these tasks, you can set 'display_name' to the name that you want to
* display, but then use this boolean to hide the task only when certain
* conditions apply.
* - 'type'
* A string representing the type of task. This parameter has three
* possible values:
* - 'normal': This indicates that the task will be treated as a regular
* callback function, which does its processing and optionally returns
* HTML output. This is the default behavior which is used when 'type' is
* not set.
* - 'batch': This indicates that the task function will return a batch
* API definition suitable for batch_set(). The installer will then take
* care of automatically running the task via batch processing.
* - 'form': This indicates that the task function will return a standard
* form API definition (and separately define validation and submit
* handlers, as appropriate). The installer will then take care of
* automatically directing the user through the form submission process.
* - 'run'
* A constant representing the manner in which the task will be run. This
* parameter has three possible values:
* - INSTALL_TASK_RUN_IF_NOT_COMPLETED: This indicates that the task will
* run once during the installation of the profile. This is the default
* behavior which is used when 'run' is not set.
* - INSTALL_TASK_SKIP: This indicates that the task will not run during
* the current installation page request. It can be used to skip running * an installation task when certain conditions are met, even though the
* task may still show on the list of installation tasks presented to the
* user.
* - INSTALL_TASK_RUN_IF_REACHED: This indicates that the task will run
* on each installation page request that reaches it. This is rarely
* necessary for an installation profile to use; it is primarily used by
* the Drupal installer for bootstrap-related tasks.
* - 'function'
* Normally this does not need to be set, but it can be used to force the
* installer to call a different function when the task is run (rather
* than the function whose name is given by the array key). This could be
* used, for example, to allow the same function to be called by two
* different tasks.
*
* @see install_state_defaults()
* @see batch_set()
*/
function hook_install_tasks() {
// Here, we define a variable to allow tasks to indicate that a particular,
// processor-intensive batch process needs to be triggered later on in the
// installation.
$myprofile_needs_batch_processing = variable_get('myprofile_needs_batch_processing', FALSE);
$tasks = array(
// This is an example of a task that defines a form which the user who is
// installing the site will be asked to fill out. To implement this task,
// your profile would define a function named myprofile_data_import_form()
// as a normal form API callback function, with associated validation and
// submit handlers. In the submit handler, in addition to saving whatever
// other data you have collected from the user, you might also call
// variable_set('myprofile_needs_batch_processing', TRUE) if the user has
// entered data which requires that batch processing will need to occur
// later on.
'myprofile_data_import_form' => array(
'display_name' => st('Data import options'),
'type' => 'form',
),
// Similarly, to implement this task, your profile would define a function
// named myprofile_settings_form() with associated validation and submit
// handlers. This form might be used to collect and save additional
// information from the user that your profile needs. There are no extra
// steps required for your profile to act as an "installation wizard"; you
// can simply define as many tasks of type 'form' as you wish to execute,
// and the forms will be presented to the user, one after another.
'myprofile_settings_form' => array(
'display_name' => st('Additional options'),
'type' => 'form',
),
// This is an example of a task that performs batch operations. To
// implement this task, your profile would define a function named
// myprofile_batch_processing() which returns a batch API array definition
// that the installer will use to execute your batch operations. Due to the
// 'myprofile_needs_batch_processing' variable used here, this task will be
// hidden and skipped unless your profile set it to TRUE in one of the
// previous tasks.
'myprofile_batch_processing' => array(
'display_name' => st('Import additional data'),
'display' => $myprofile_needs_batch_processing,
'type' => 'batch',
'run' => $myprofile_needs_batch_processing ? INSTALL_TASK_RUN_IF_NOT_COMPLETED : INSTALL_TASK_SKIP,
),
// This is an example of a task that will not be displayed in the list that
// the user sees. To implement this task, your profile would define a
// function named myprofile_final_site_setup(), in which additional,
// automated site setup operations would be performed. Since this is the
// last task defined by your profile, you should also use this function to
// call variable_del('myprofile_needs_batch_processing') and clean up the
// variable that was used above. If you want the user to pass to the final
// Drupal installation tasks uninterrupted, return no output from this
// function. Otherwise, return themed output that the user will see (for
// example, a confirmation page explaining that your profile's tasks are // complete, with a link to reload the current page and therefore pass on
// to the final Drupal installation tasks when the user is ready to do so).
'myprofile_final_site_setup' => array(
),
);
return $tasks;
}
/**
* Change the page the user is sent to by drupal_goto().
*
* @param &$path
* A Drupal path or a full URL.
* @param &$options
* An associative array of additional URL options to pass to url().
* @param &$http_response_code
* The HTTP status code to use for the redirection. See drupal_goto() for more
* information.
*/
function hook_drupal_goto_alter(&$path, &$options, &$http_response_code) {
// A good addition to misery module.
$http_response_code = 500;
}
/**
* Alter XHTML HEAD tags before they are rendered by drupal_get_html_head().
*
* Elements available to be altered are only those added using
* drupal_add_html_head_link() or drupal_add_html_head(). CSS and JS files
* are handled using drupal_add_css() and drupal_add_js(), so the head links
* for those files will not appear in the $head_elements array.
*
* @param $head_elements
* An array of renderable elements. Generally the values of the #attributes
* array will be the most likely target for changes.
*/
function hook_html_head_alter(&$head_elements) {
foreach ($head_elements as $key => $element) {
if (isset($element['#attributes']['rel']) && $element['#attributes']['rel'] == 'canonical') {
// I want a custom canonical url.
$head_elements[$key]['#attributes']['href'] = mymodule_canonical_url();
}
}
}
/**
* Alter the full list of installation tasks.
*
* @param $tasks
* An array of all available installation tasks, including those provided by
* Drupal core. You can modify this array to change or replace any part of
* the Drupal installation process that occurs after the installation profile
* is selected.
* @param $install_state
* An array of information about the current installation state.
*/
function hook_install_tasks_alter(&$tasks, $install_state) {
// Replace the "Choose language" installation task provided by Drupal core
// with a custom callback function defined by this installation profile.
$tasks['install_select_locale']['function'] = 'myprofile_locale_selection';
}
/**
* Alter MIME type mappings used to determine MIME type from a file extension.
*
* This hook is run when file_mimetype_mapping() is called. It is used to
* allow modules to add to or modify the default mapping from
* file_default_mimetype_mapping().
*
* @param $mapping * An array of mimetypes correlated to the extensions that relate to them.
* The array has 'mimetypes' and 'extensions' elements, each of which is an
* array.
*
* @see file_default_mimetype_mapping()
*/
function hook_file_mimetype_mapping_alter(&$mapping) {
// Add new MIME type 'drupal/info'.
$mapping['mimetypes']['example_info'] = 'drupal/info';
// Add new extension '.info' and map it to the 'drupal/info' MIME type.
$mapping['extensions']['info'] = 'example_info';
// Override existing extension mapping for '.ogg' files.
$mapping['extensions']['ogg'] = 189;
}
/**
* Declares information about actions.
*
* Any module can define actions, and then call actions_do() to make those
* actions happen in response to events. The trigger module provides a user
* interface for associating actions with module-defined triggers, and it makes
* sure the core triggers fire off actions when their events happen.
*
* An action consists of two or three parts:
* - an action definition (returned by this hook)
* - a function which performs the action (which by convention is named
* MODULE_description-of-function_action)
* - an optional form definition function that defines a configuration form
* (which has the name of the action function with '_form' appended to it.)
*
* The action function takes two to four arguments, which come from the input
* arguments to actions_do().
*
* @return
* An associative array of action descriptions. The keys of the array
* are the names of the action functions, and each corresponding value
* is an associative array with the following key-value pairs:
* - 'type': The type of object this action acts upon. Core actions have types
* 'node', 'user', 'comment', and 'system'.
* - 'label': The human-readable name of the action, which should be passed
* through the t() function for translation.
* - 'configurable': If FALSE, then the action doesn't require any extra
* configuration. If TRUE, then your module must define a form function with
* the same name as the action function with '_form' appended (e.g., the
* form for 'node_assign_owner_action' is 'node_assign_owner_action_form'.)
* This function takes $context as its only parameter, and is paired with
* the usual _submit function, and possibly a _validate function.
* - 'triggers': An array of the events (that is, hooks) that can trigger this
* action. For example: array('node_insert', 'user_update'). You can also
* declare support for any trigger by returning array('any') for this value.
* - 'behavior': (optional) A machine-readable array of behaviors of this
* action, used to signal additionally required actions that may need to be
* triggered. Currently recognized behaviors by Trigger module:
* - 'changes_property': If an action with this behavior is assigned to a
* trigger other than a "presave" hook, any save actions also assigned to
* this trigger are moved later in the list. If no save action is present,
* one will be added.
* Modules that are processing actions (like Trigger module) should take
* special care for the "presave" hook, in which case a dependent "save"
* action should NOT be invoked.
*
* @ingroup actions
*/
function hook_action_info() {
return array(
'comment_unpublish_action' => array(
'type' => 'comment',
'label' => t('Unpublish comment'),
'configurable' => FALSE,
'behavior' => array('changes_property'), 'triggers' => array('comment_presave', 'comment_insert', 'comment_update'),
),
'comment_unpublish_by_keyword_action' => array(
'type' => 'comment',
'label' => t('Unpublish comment containing keyword(s)'),
'configurable' => TRUE,
'behavior' => array('changes_property'),
'triggers' => array('comment_presave', 'comment_insert', 'comment_update'),
),
'comment_save_action' => array(
'type' => 'comment',
'label' => t('Save comment'),
'configurable' => FALSE,
'triggers' => array('comment_insert', 'comment_update'),
),
);
}
/**
* Executes code after an action is deleted.
*
* @param $aid
* The action ID.
*/
function hook_actions_delete($aid) {
db_delete('actions_assignments')
->condition('aid', $aid)
->execute();
}
/**
* Alters the actions declared by another module.
*
* Called by actions_list() to allow modules to alter the return values from
* implementations of hook_action_info().
*
* @see trigger_example_action_info_alter()
*/
function hook_action_info_alter(&$actions) {
$actions['node_unpublish_action']['label'] = t('Unpublish and remove from public view.');
}
/**
* Declare archivers to the system.
*
* An archiver is a class that is able to package and unpackage one or more files
* into a single possibly compressed file. Common examples of such files are
* zip files and tar.gz files. All archiver classes must implement
* ArchiverInterface.
*
* Each entry should be keyed on a unique value, and specify three
* additional keys:
* - class: The name of the PHP class for this archiver.
* - extensions: An array of file extensions that this archiver supports.
* - weight: This optional key specifies the weight of this archiver.
* When mapping file extensions to archivers, the first archiver by
* weight found that supports the requested extension will be used.
*
* @see hook_archiver_info_alter()
*/
function hook_archiver_info() {
return array(
'tar' => array(
'class' => 'ArchiverTar',
'extensions' => array('tar', 'tar.gz', 'tar.bz2'),
),
);
}
/** * Alter archiver information declared by other modules.
*
* See hook_archiver_info() for a description of archivers and the archiver
* information structure.
*
* @param $info
* Archiver information to alter (return values from hook_archiver_info()).
*/
function hook_archiver_info_alter(&$info) {
$info['tar']['extensions'][] = 'tgz';
}
/**
* Define additional date types.
*
* Next to the 'long', 'medium' and 'short' date types defined in core, any
* module can define additional types that can be used when displaying dates,
* by implementing this hook. A date type is basically just a name for a date
* format.
*
* Date types are used in the administration interface: a user can assign
* date format types defined in hook_date_formats() to date types defined in
* this hook. Once a format has been assigned by a user, the machine name of a
* type can be used in the format_date() function to format a date using the
* chosen formatting.
*
* To define a date type in a module and make sure a format has been assigned to
* it, without requiring a user to visit the administrative interface, use
* @code variable_set('date_format_' . $type, $format); @endcode
* where $type is the machine-readable name defined here, and $format is a PHP
* date format string.
*
* To avoid namespace collisions with date types defined by other modules, it is
* recommended that each date type starts with the module name. A date type
* can consist of letters, numbers and underscores.
*
* @return
* An array of date types where the keys are the machine-readable names and
* the values are the human-readable labels.
*
* @see hook_date_formats()
* @see format_date()
*/
function hook_date_format_types() {
// Define the core date format types.
return array(
'long' => t('Long'),
'medium' => t('Medium'),
'short' => t('Short'),
);
}
/**
* Modify existing date types.
*
* Allows other modules to modify existing date types like 'long'. Called by
* _system_date_format_types_build(). For instance, A module may use this hook
* to apply settings across all date types, such as locking all date types so
* they appear to be provided by the system.
*
* @param $types
* A list of date types. Each date type is keyed by the machine-readable name
* and the values are associative arrays containing:
* - is_new: Set to FALSE to override previous settings.
* - module: The name of the module that created the date type.
* - type: The machine-readable date type name.
* - title: The human-readable date type name.
* - locked: Specifies that the date type is system-provided.
*/
function hook_date_format_types_alter(&$types) { foreach ($types as $name => $type) {
$types[$name]['locked'] = 1;
}
}
/**
* Define additional date formats.
*
* This hook is used to define the PHP date format strings that can be assigned
* to date types in the administrative interface. A module can provide date
* format strings for the core-provided date types ('long', 'medium', and
* 'short'), or for date types defined in hook_date_format_types() by itself
* or another module.
*
* Since date formats can be locale-specific, you can specify the locales that
* each date format string applies to. There may be more than one locale for a
* format. There may also be more than one format for the same locale. For
* example d/m/Y and Y/m/d work equally well in some locales. You may wish to
* define some additional date formats that aren't specific to any one locale,
* for example, "Y m". For these cases, the 'locales' component of the return
* value should be omitted.
*
* Providing a date format here does not normally assign the format to be
* used with the associated date type -- a user has to choose a format for each
* date type in the administrative interface. There is one exception: locale
* initialization chooses a locale-specific format for the three core-provided
* types (see locale_get_localized_date_format() for details). If your module
* needs to ensure that a date type it defines has a format associated with it,
* call @code variable_set('date_format_' . $type, $format); @endcode
* where $type is the machine-readable name defined in hook_date_format_types(),
* and $format is a PHP date format string.
*
* @return
* A list of date formats to offer as choices in the administrative
* interface. Each date format is a keyed array consisting of three elements:
* - 'type': The date type name that this format can be used with, as
* declared in an implementation of hook_date_format_types().
* - 'format': A PHP date format string to use when formatting dates. It
* can contain any of the formatting options described at
* http://php.net/manual/en/function.date.php
* - 'locales': (optional) An array of 2 and 5 character locale codes,
* defining which locales this format applies to (for example, 'en',
* 'en-us', etc.). If your date format is not language-specific, leave this
* array empty.
*
* @see hook_date_format_types()
*/
function hook_date_formats() {
return array(
array(
'type' => 'mymodule_extra_long',
'format' => 'l jS F Y H:i:s e',
'locales' => array('en-ie'),
),
array(
'type' => 'mymodule_extra_long',
'format' => 'l jS F Y h:i:sa',
'locales' => array('en', 'en-us'),
),
array(
'type' => 'short',
'format' => 'F Y',
'locales' => array(),
),
);
}
/**
* Alter date formats declared by another module.
* * Called by _system_date_format_types_build() to allow modules to alter the
* return values from implementations of hook_date_formats().
*/
function hook_date_formats_alter(&$formats) {
foreach ($formats as $id => $format) {
$formats[$id]['locales'][] = 'en-ca';
}
}
/**
* Alters the delivery callback used to send the result of the page callback to the browser.
*
* Called by drupal_deliver_page() to allow modules to alter how the
* page is delivered to the browser.
*
* This hook is intended for altering the delivery callback based on
* information unrelated to the path of the page accessed. For example,
* it can be used to set the delivery callback based on a HTTP request
* header (as shown in the code sample). To specify a delivery callback
* based on path information, use hook_menu() or hook_menu_alter().
*
* This hook can also be used as an API function that can be used to explicitly
* set the delivery callback from some other function. For example, for a module
* named MODULE:
* @code
* function MODULE_page_delivery_callback_alter(&$callback, $set = FALSE) {
* static $stored_callback;
* if ($set) {
* $stored_callback = $callback;
* }
* elseif (isset($stored_callback)) {
* $callback = $stored_callback;
* }
* }
* function SOMEWHERE_ELSE() {
* $desired_delivery_callback = 'foo';
* MODULE_page_delivery_callback_alter($desired_delivery_callback, TRUE);
* }
* @endcode
*
* @param $callback
* The name of a function.
*
* @see drupal_deliver_page()
*/
function hook_page_delivery_callback_alter(&$callback) {
// jQuery sets a HTTP_X_REQUESTED_WITH header of 'XMLHttpRequest'.
// If a page would normally be delivered as an html page, and it is called
// from jQuery, deliver it instead as an Ajax response.
if (isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] == 'XMLHttpRequest' && $callback == 'drupal_deliver_html_page') {
$callback = 'ajax_deliver';
}
}
/**
* Alters theme operation links.
*
* @param $theme_groups
* An associative array containing groups of themes.
*
* @see system_themes_page()
*/
function hook_system_themes_page_alter(&$theme_groups) {
foreach ($theme_groups as $state => &$group) {
foreach ($theme_groups[$state] as &$theme) {
// Add a foo link to each list of theme operations.
$theme->operations[] = l(t('Foo'), 'admin/appearance/foo', array('query' => array('theme' => $theme->name)));
}
}
}
/**
* Alters inbound URL requests.
*
* @param $path
* The path being constructed, which, if a path alias, has been resolved to a
* Drupal path by the database, and which also may have been altered by other
* modules before this one.
* @param $original_path
* The original path, before being checked for path aliases or altered by any
* modules.
* @param $path_language
* The language of the path.
*
* @see drupal_get_normal_path()
*/
function hook_url_inbound_alter(&$path, $original_path, $path_language) {
// Create the path user/me/edit, which allows a user to edit their account.
if (preg_match('|^user/me/edit(/.*)?|', $path, $matches)) {
global $user;
$path = 'user/' . $user->uid . '/edit' . $matches[1];
}
}
/**
* Alters outbound URLs.
*
* @param $path
* The outbound path to alter, not adjusted for path aliases yet. It won't be
* adjusted for path aliases until all modules are finished altering it, thus
* being consistent with hook_url_alter_inbound(), which adjusts for all path
* aliases before allowing modules to alter it. This may have been altered by
* other modules before this one.
* @param $options
* A set of URL options for the URL so elements such as a fragment or a query
* string can be added to the URL.
* @param $original_path
* The original path, before being altered by any modules.
*
* @see url()
*/
function hook_url_outbound_alter(&$path, &$options, $original_path) {
// Use an external RSS feed rather than the Drupal one.
if ($path == 'rss.xml') {
$path = 'http://example.com/rss.xml';
$options['external'] = TRUE;
}
// Instead of pointing to user/[uid]/edit, point to user/me/edit.
if (preg_match('|^user/([0-9]*)/edit(/.*)?|', $path, $matches)) {
global $user;
if ($user->uid == $matches[1]) {
$path = 'user/me/edit' . $matches[2];
}
}
}
/**
* Alter the username that is displayed for a user.
*
* Called by format_username() to allow modules to alter the username that's
* displayed. Can be used to ensure user privacy in situations where
* $account->name is too revealing.
*
* @param &$name
* The string that format_username() will return.
*
* @param $account
* The account object passed to format_username().
* * @see format_username()
*/
function hook_username_alter(&$name, $account) {
// Display the user's uid instead of name.
if (isset($account->uid)) {
$name = t('User !uid', array('!uid' => $account->uid));
}
}
/**
* Provide replacement values for placeholder tokens.
*
* This hook is invoked when someone calls token_replace(). That function first
* scans the text for [type:token] patterns, and splits the needed tokens into
* groups by type. Then hook_tokens() is invoked on each token-type group,
* allowing your module to respond by providing replacement text for any of
* the tokens in the group that your module knows how to process.
*
* A module implementing this hook should also implement hook_token_info() in
* order to list its available tokens on editing screens.
*
* @param $type
* The machine-readable name of the type (group) of token being replaced, such
* as 'node', 'user', or another type defined by a hook_token_info()
* implementation.
* @param $tokens
* An array of tokens to be replaced. The keys are the machine-readable token
* names, and the values are the raw [type:token] strings that appeared in the
* original text.
* @param $data
* (optional) An associative array of data objects to be used when generating
* replacement values, as supplied in the $data parameter to token_replace().
* @param $options
* (optional) An associative array of options for token replacement; see
* token_replace() for possible values.
*
* @return
* An associative array of replacement values, keyed by the raw [type:token]
* strings from the original text.
*
* @see hook_token_info()
* @see hook_tokens_alter()
*/
function hook_tokens($type, $tokens, array $data = array(), array $options = array()) {
$url_options = array('absolute' => TRUE);
if (isset($options['language'])) {
$url_options['language'] = $options['language'];
$language_code = $options['language']->language;
}
else {
$language_code = NULL;
}
$sanitize = !empty($options['sanitize']);
$replacements = array();
if ($type == 'node' && !empty($data['node'])) {
$node = $data['node'];
foreach ($tokens as $name => $original) {
switch ($name) {
// Simple key values on the node.
case 'nid':
$replacements[$original] = $node->nid;
break;
case 'title':
$replacements[$original] = $sanitize ? check_plain($node->title) : $node->title;
break;
case 'edit-url':
$replacements[$original] = url('node/' . $node->nid . '/edit', $url_options);
break;
// Default values for the chained tokens handled below.
case 'author':
$name = ($node->uid == 0) ? variable_get('anonymous', t('Anonymous')) : $node->name;
$replacements[$original] = $sanitize ? filter_xss($name) : $name;
break;
case 'created':
$replacements[$original] = format_date($node->created, 'medium', '', NULL, $language_code);
break;
}
}
if ($author_tokens = token_find_with_prefix($tokens, 'author')) {
$author = user_load($node->uid);
$replacements += token_generate('user', $author_tokens, array('user' => $author), $options);
}
if ($created_tokens = token_find_with_prefix($tokens, 'created')) {
$replacements += token_generate('date', $created_tokens, array('date' => $node->created), $options);
}
}
return $replacements;
}
/**
* Alter replacement values for placeholder tokens.
*
* @param $replacements
* An associative array of replacements returned by hook_tokens().
* @param $context
* The context in which hook_tokens() was called. An associative array with
* the following keys, which have the same meaning as the corresponding
* parameters of hook_tokens():
* - 'type'
* - 'tokens'
* - 'data'
* - 'options'
*
* @see hook_tokens()
*/
function hook_tokens_alter(array &$replacements, array $context) {
$options = $context['options'];
if (isset($options['language'])) {
$url_options['language'] = $options['language'];
$language_code = $options['language']->language;
}
else {
$language_code = NULL;
}
$sanitize = !empty($options['sanitize']);
if ($context['type'] == 'node' && !empty($context['data']['node'])) {
$node = $context['data']['node'];
// Alter the [node:title] token, and replace it with the rendered content
// of a field (field_title).
if (isset($context['tokens']['title'])) {
$title = field_view_field('node', $node, 'field_title', 'default', $language_code);
$replacements[$context['tokens']['title']] = drupal_render($title);
}
}
}
/** * Provide information about available placeholder tokens and token types.
*
* Tokens are placeholders that can be put into text by using the syntax
* [type:token], where type is the machine-readable name of a token type, and
* token is the machine-readable name of a token within this group. This hook
* provides a list of types and tokens to be displayed on text editing screens,
* so that people editing text can see what their token options are.
*
* The actual token replacement is done by token_replace(), which invokes
* hook_tokens(). Your module will need to implement that hook in order to
* generate token replacements from the tokens defined here.
*
* @return
* An associative array of available tokens and token types. The outer array
* has two components:
* - types: An associative array of token types (groups). Each token type is
* an associative array with the following components:
* - name: The translated human-readable short name of the token type.
* - description: A translated longer description of the token type.
* - needs-data: The type of data that must be provided to token_replace()
* in the $data argument (i.e., the key name in $data) in order for tokens
* of this type to be used in the $text being processed. For instance, if
* the token needs a node object, 'needs-data' should be 'node', and to
* use this token in token_replace(), the caller needs to supply a node
* object as $data['node']. Some token data can also be supplied
* indirectly; for instance, a node object in $data supplies a user object
* (the author of the node), allowing user tokens to be used when only
* a node data object is supplied.
* - tokens: An associative array of tokens. The outer array is keyed by the
* group name (the same key as in the types array). Within each group of
* tokens, each token item is keyed by the machine name of the token, and
* each token item has the following components:
* - name: The translated human-readable short name of the token.
* - description: A translated longer description of the token.
* - type (optional): A 'needs-data' data type supplied by this token, which
* should match a 'needs-data' value from another token type. For example,
* the node author token provides a user object, which can then be used
* for token replacement data in token_replace() without having to supply
* a separate user object.
*
* @see hook_token_info_alter()
* @see hook_tokens()
*/
function hook_token_info() {
$type = array(
'name' => t('Nodes'),
'description' => t('Tokens related to individual nodes.'),
'needs-data' => 'node',
);
// Core tokens for nodes.
$node['nid'] = array(
'name' => t("Node ID"),
'description' => t("The unique ID of the node."),
);
$node['title'] = array(
'name' => t("Title"),
'description' => t("The title of the node."),
);
$node['edit-url'] = array(
'name' => t("Edit URL"),
'description' => t("The URL of the node's edit page."),
);
// Chained tokens for nodes.
$node['created'] = array(
'name' => t("Date created"),
'description' => t("The date the node was posted."),
'type' => 'date',
); $node['author'] = array(
'name' => t("Author"),
'description' => t("The author of the node."),
'type' => 'user',
);
return array(
'types' => array('node' => $type),
'tokens' => array('node' => $node),
);
}
/**
* Alter the metadata about available placeholder tokens and token types.
*
* @param $data
* The associative array of token definitions from hook_token_info().
*
* @see hook_token_info()
*/
function hook_token_info_alter(&$data) {
// Modify description of node tokens for our site.
$data['tokens']['node']['nid'] = array(
'name' => t("Node ID"),
'description' => t("The unique ID of the article."),
);
$data['tokens']['node']['title'] = array(
'name' => t("Title"),
'description' => t("The title of the article."),
);
// Chained tokens for nodes.
$data['tokens']['node']['created'] = array(
'name' => t("Date created"),
'description' => t("The date the article was posted."),
'type' => 'date',
);
}
/**
* Alter batch information before a batch is processed.
*
* Called by batch_process() to allow modules to alter a batch before it is
* processed.
*
* @param $batch
* The associative array of batch information. See batch_set() for details on
* what this could contain.
*
* @see batch_set()
* @see batch_process()
*
* @ingroup batch
*/
function hook_batch_alter(&$batch) {
// If the current page request is inside the overlay, add ?render=overlay to
// the success callback URL, so that it appears correctly within the overlay.
if (overlay_get_mode() == 'child') {
if (isset($batch['url_options']['query'])) {
$batch['url_options']['query']['render'] = 'overlay';
}
else {
$batch['url_options']['query'] = array('render' => 'overlay');
}
}
}
/**
* Provide information on Updaters (classes that can update Drupal).
* * An Updater is a class that knows how to update various parts of the Drupal
* file system, for example to update modules that have newer releases, or to
* install a new theme.
*
* @return
* An associative array of information about the updater(s) being provided.
* This array is keyed by a unique identifier for each updater, and the
* values are subarrays that can contain the following keys:
* - class: The name of the PHP class which implements this updater.
* - name: Human-readable name of this updater.
* - weight: Controls what order the Updater classes are consulted to decide
* which one should handle a given task. When an update task is being run,
* the system will loop through all the Updater classes defined in this
* registry in weight order and let each class respond to the task and
* decide if each Updater wants to handle the task. In general, this
* doesn't matter, but if you need to override an existing Updater, make
* sure your Updater has a lighter weight so that it comes first.
*
* @see drupal_get_updaters()
* @see hook_updater_info_alter()
*/
function hook_updater_info() {
return array(
'module' => array(
'class' => 'ModuleUpdater',
'name' => t('Update modules'),
'weight' => 0,
),
'theme' => array(
'class' => 'ThemeUpdater',
'name' => t('Update themes'),
'weight' => 0,
),
);
}
/**
* Alter the Updater information array.
*
* An Updater is a class that knows how to update various parts of the Drupal
* file system, for example to update modules that have newer releases, or to
* install a new theme.
*
* @param array $updaters
* Associative array of updaters as defined through hook_updater_info().
* Alter this array directly.
*
* @see drupal_get_updaters()
* @see hook_updater_info()
*/
function hook_updater_info_alter(&$updaters) {
// Adjust weight so that the theme Updater gets a chance to handle a given
// update task before module updaters.
$updaters['theme']['weight'] = -1;
}
/**
* Alter the default country list.
*
* @param $countries
* The associative array of countries keyed by ISO 3166-1 country code.
*
* @see country_get_list()
* @see _country_get_predefined_list()
*/
function hook_countries_alter(&$countries) {
// Elbonia is now independent, so add it to the country list.
$countries['EB'] = 'Elbonia';
}
/**
* Control site status before menu dispatching.
*
* The hook is called after checking whether the site is offline but before
* the current router item is retrieved and executed by
* menu_execute_active_handler(). If the site is in offline mode,
* $menu_site_status is set to MENU_SITE_OFFLINE.
*
* @param $menu_site_status
* Supported values are MENU_SITE_OFFLINE, MENU_ACCESS_DENIED,
* MENU_NOT_FOUND and MENU_SITE_ONLINE. Any other value than
* MENU_SITE_ONLINE will skip the default menu handling system and be passed
* for delivery to drupal_deliver_page() with a NULL
* $default_delivery_callback.
* @param $path
* Contains the system path that is going to be loaded. This is read only,
* use hook_url_inbound_alter() to change the path.
*/
function hook_menu_site_status_alter(&$menu_site_status, $path) {
// Allow access to my_module/authentication even if site is in offline mode.
if ($menu_site_status == MENU_SITE_OFFLINE && user_is_anonymous() && $path == 'my_module/authentication') {
$menu_site_status = MENU_SITE_ONLINE;
}
}
/**
* Register information about FileTransfer classes provided by a module.
*
* The FileTransfer class allows transfering files over a specific type of
* connection. Core provides classes for FTP and SSH. Contributed modules are
* free to extend the FileTransfer base class to add other connection types,
* and if these classes are registered via hook_filetransfer_info(), those
* connection types will be available to site administrators using the Update
* manager when they are redirected to the authorize.php script to authorize
* the file operations.
*
* @return array
* Nested array of information about FileTransfer classes. Each key is a
* FileTransfer type (not human readable, used for form elements and
* variable names, etc), and the values are subarrays that define properties
* of that type. The keys in each subarray are:
* - 'title': Required. The human-readable name of the connection type.
* - 'class': Required. The name of the FileTransfer class. The constructor
* will always be passed the full path to the root of the site that should
* be used to restrict where file transfer operations can occur (the $jail)
* and an array of settings values returned by the settings form.
* - 'file': Required. The include file containing the FileTransfer class.
* This should be a separate .inc file, not just the .module file, so that
* the minimum possible code is loaded when authorize.php is running.
* - 'file path': Optional. The directory (relative to the Drupal root)
* where the include file lives. If not defined, defaults to the base
* directory of the module implementing the hook.
* - 'weight': Optional. Integer weight used for sorting connection types on
* the authorize.php form.
*
* @see FileTransfer
* @see authorize.php
* @see hook_filetransfer_info_alter()
* @see drupal_get_filetransfer_info()
*/
function hook_filetransfer_info() {
$info['sftp'] = array(
'title' => t('SFTP (Secure FTP)'),
'file' => 'sftp.filetransfer.inc',
'class' => 'FileTransferSFTP',
'weight' => 10,
);
return $info;
}
/**
* Alter the FileTransfer class registry.
*
* @param array $filetransfer_info
* Reference to a nested array containing information about the FileTransfer
* class registry.
*
* @see hook_filetransfer_info()
*/
function hook_filetransfer_info_alter(&$filetransfer_info) {
if (variable_get('paranoia', FALSE)) {
// Remove the FTP option entirely.
unset($filetransfer_info['ftp']);
// Make sure the SSH option is listed first.
$filetransfer_info['ssh']['weight'] = -10;
}
}
/**
* @} End of "addtogroup hooks".
*/