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<?php
/**
* @file
* Functions that need to be loaded on every Drupal request.
*/
use Drupal\Component\Utility\Crypt;
use Drupal\Component\Utility\Html;
use Drupal\Component\Utility\SafeMarkup;
use Drupal\Component\Utility\Unicode;
use Drupal\Core\Logger\RfcLogLevel;
use Drupal\Core\Render\Markup;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\Site\Settings;
use Drupal\Core\Utility\Error;
/**
* Minimum supported version of PHP.
*/
const DRUPAL_MINIMUM_PHP = '5.5.9';
/**
* Minimum recommended value of PHP memory_limit.
*
* 64M was chosen as a minimum requirement in order to allow for additional
* contributed modules to be installed prior to hitting the limit. However,
* 40M is the target for the Standard installation profile.
*/
const DRUPAL_MINIMUM_PHP_MEMORY_LIMIT = '64M';
/**
* Error reporting level: display no errors.
*/
const ERROR_REPORTING_HIDE = 'hide';
/**
* Error reporting level: display errors and warnings.
*/
const ERROR_REPORTING_DISPLAY_SOME = 'some';
/**
* Error reporting level: display all messages.
*/
const ERROR_REPORTING_DISPLAY_ALL = 'all';
/**
* Error reporting level: display all messages, plus backtrace information.
*/
const ERROR_REPORTING_DISPLAY_VERBOSE = 'verbose';
/**
* Role ID for anonymous users; should match what's in the "role" table.
*
* @deprecated in Drupal 8.0.0, will be removed before Drupal 9.0.0.
* Use Drupal\Core\Session\AccountInterface::ANONYMOUS_ROLE or
* \Drupal\user\RoleInterface::ANONYMOUS_ID instead.
*/
const DRUPAL_ANONYMOUS_RID = AccountInterface::ANONYMOUS_ROLE;
/**
* Role ID for authenticated users; should match what's in the "role" table.
*
* @deprecated in Drupal 8.0.0, will be removed before Drupal 9.0.0.
* Use Drupal\Core\Session\AccountInterface::AUTHENTICATED_ROLE or
* \Drupal\user\RoleInterface::AUTHENTICATED_ID instead.
*/
const DRUPAL_AUTHENTICATED_RID = AccountInterface::AUTHENTICATED_ROLE;
/**
* The maximum number of characters in a module or theme name. */
const DRUPAL_EXTENSION_NAME_MAX_LENGTH = 50;
/**
* Time of the current request in seconds elapsed since the Unix Epoch.
*
* This differs from $_SERVER['REQUEST_TIME'], which is stored as a float
* since PHP 5.4.0. Float timestamps confuse most PHP functions
* (including date_create()).
*
* @see http://php.net/manual/reserved.variables.server.php
* @see http://php.net/manual/function.time.php
*/
define('REQUEST_TIME', (int) $_SERVER['REQUEST_TIME']);
/**
* Regular expression to match PHP function names.
*
* @see http://php.net/manual/language.functions.php
*/
const DRUPAL_PHP_FUNCTION_PATTERN = '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*';
/**
* $config_directories key for active directory.
*
* @see config_get_config_directory()
*
* @deprecated in Drupal 8.0.x and will be removed before 9.0.0. Drupal core no
* longer creates an active directory.
*/
const CONFIG_ACTIVE_DIRECTORY = 'active';
/**
* $config_directories key for sync directory.
*
* @see config_get_config_directory()
*/
const CONFIG_SYNC_DIRECTORY = 'sync';
/**
* $config_directories key for staging directory.
*
* @see config_get_config_directory()
* @see CONFIG_SYNC_DIRECTORY
*
* @deprecated in Drupal 8.0.x and will be removed before 9.0.0. The staging
* directory was renamed to sync.
*/
const CONFIG_STAGING_DIRECTORY = 'staging';
/**
* Defines the root directory of the Drupal installation.
*
* This strips two levels of directories off the current directory.
*/
define('DRUPAL_ROOT', dirname(dirname(__DIR__)));
/**
* Returns the path of a configuration directory.
*
* Configuration directories are configured using $config_directories in
* settings.php.
*
* @param string $type
* The type of config directory to return. Drupal core provides the
* CONFIG_SYNC_DIRECTORY constant to access the sync directory.
*
* @return string
* The configuration directory path.
* * @throws \Exception
*/
function config_get_config_directory($type) {
global $config_directories;
// @todo Remove fallback in Drupal 9. https://www.drupal.org/node/2574943
if ($type == CONFIG_SYNC_DIRECTORY && !isset($config_directories[CONFIG_SYNC_DIRECTORY]) && isset($config_directories[CONFIG_STAGING_DIRECTORY])) {
$type = CONFIG_STAGING_DIRECTORY;
}
if (!empty($config_directories[$type])) {
return $config_directories[$type];
}
throw new \Exception("The configuration directory type '$type' does not exist");
}
/**
* Returns and optionally sets the filename for a system resource.
*
* The filename, whether provided, cached, or retrieved from the database, is
* only returned if the file exists.
*
* This function plays a key role in allowing Drupal's resources (modules
* and themes) to be located in different places depending on a site's
* configuration. For example, a module 'foo' may legally be located
* in any of these three places:
*
* core/modules/foo/foo.info.yml
* modules/foo/foo.info.yml
* sites/example.com/modules/foo/foo.info.yml
*
* Calling drupal_get_filename('module', 'foo') will give you one of
* the above, depending on where the module is located.
*
* @param $type
* The type of the item; one of 'core', 'profile', 'module', 'theme', or
* 'theme_engine'.
* @param $name
* The name of the item for which the filename is requested. Ignored for
* $type 'core'.
* @param $filename
* The filename of the item if it is to be set explicitly rather
* than by consulting the database.
*
* @return
* The filename of the requested item or NULL if the item is not found.
*/
function drupal_get_filename($type, $name, $filename = NULL) {
// The location of files will not change during the request, so do not use
// drupal_static().
static $files = array();
// Type 'core' only exists to simplify application-level logic; it always maps
// to the /core directory, whereas $name is ignored. It is only requested via
// drupal_get_path(). /core/core.info.yml does not exist, but is required
// since drupal_get_path() returns the dirname() of the returned pathname.
if ($type === 'core') {
return 'core/core.info.yml';
}
// Profiles are converted into modules in system_rebuild_module_data().
// @todo Remove false-exposure of profiles as modules.
$original_type = $type;
if ($type == 'profile') {
$type = 'module';
}
if (!isset($files[$type])) {
$files[$type] = array();
}
if (isset($filename)) {
$files[$type][$name] = $filename;
}
elseif (!isset($files[$type][$name])) {
// If the pathname of the requested extension is not known, try to retrieve
// the list of extension pathnames from various providers, checking faster
// providers first.
// Retrieve the current module list (derived from the service container).
if ($type == 'module' && \Drupal::hasService('module_handler')) {
foreach (\Drupal::moduleHandler()->getModuleList() as $module_name => $module) {
$files[$type][$module_name] = $module->getPathname();
}
}
// If still unknown, retrieve the file list prepared in state by
// system_rebuild_module_data() and
// \Drupal\Core\Extension\ThemeHandlerInterface::rebuildThemeData().
if (!isset($files[$type][$name]) && \Drupal::hasService('state')) {
$files[$type] += \Drupal::state()->get('system.' . $type . '.files', array());
}
// If still unknown, create a user-level error message.
if (!isset($files[$type][$name])) {
trigger_error(SafeMarkup::format('The following @type is missing from the file system: @name', array('@type' => $type, '@name' => $name)), E_USER_WARNING);
}
}
if (isset($files[$type][$name])) {
return $files[$type][$name];
}
}
/**
* Returns the path to a system item (module, theme, etc.).
*
* @param $type
* The type of the item; one of 'core', 'profile', 'module', 'theme', or
* 'theme_engine'.
* @param $name
* The name of the item for which the path is requested. Ignored for
* $type 'core'.
*
* @return
* The path to the requested item or an empty string if the item is not found.
*/
function drupal_get_path($type, $name) {
return dirname(drupal_get_filename($type, $name));
}
/**
* Translates a string to the current language or to a given language.
*
* The t() function serves two purposes. First, at run-time it translates
* user-visible text into the appropriate language. Second, various mechanisms
* that figure out what text needs to be translated work off t() -- the text
* inside t() calls is added to the database of strings to be translated.
* These strings are expected to be in English, so the first argument should
* always be in English. To enable a fully-translatable site, it is important
* that all human-readable text that will be displayed on the site or sent to
* a user is passed through the t() function, or a related function. See the
* @link https://www.drupal.org/node/322729 Localization API @endlink pages for
* more information, including recommendations on how to break up or not
* break up strings for translation.
*
* @section sec_translating_vars Translating Variables
* You should never use t() to translate variables, such as calling t($text)
* unless the text that the variable holds has been passed through t()
* elsewhere (e.g., $text is one of several translated literal strings in an
* array). It is especially important never to call t($user_text) where
* $user_text is some text that a user entered - doing that can lead to
* cross-site scripting and other security problems. However, you can use
* variable substitution in your string, to put variable text such as user * names or link URLs into translated text. Variable substitution looks like
* this:
* @code
* $text = t("@name's blog", array('@name' => $account->getDisplayName()));
* @endcode
* Basically, you can put variables like @name into your string, and t() will
* substitute their sanitized values at translation time. (See the
* Localization API pages referenced above and the documentation of
* \Drupal\Component\Utility\SafeMarkup::format() for details about how to
* define variables in your string.). Translators can then rearrange the string
* as necessary for the language (e.g., in Spanish, it might be "blog de
* @name").
*
* @param $string
* A string containing the English string to translate.
* @param $args
* An associative array of replacements to make after translation. Based
* on the first character of the key, the value is escaped and/or themed.
* See \Drupal\Component\Utility\SafeMarkup::format() for details.
* @param $options
* An associative array of additional options, with the following elements:
* - 'langcode' (defaults to the current language): The language code to
* translate to a language other than what is used to display the page.
* - 'context' (defaults to the empty context): The context the source string
* belongs to.
*
* @return
* The translated string.
*
* @see \Drupal\Component\Utility\SafeMarkup::format()
* @ingroup sanitization
*/
function t($string, array $args = array(), array $options = array()) {
return \Drupal::translation()->translate($string, $args, $options);
}
/**
* Formats a string for HTML display by replacing variable placeholders.
*
* @see \Drupal\Component\Utility\SafeMarkup::format()
* @see t()
* @ingroup sanitization
*
* @deprecated in Drupal 8.0.0, will be removed before Drupal 9.0.0.
* Use \Drupal\Component\Utility\SafeMarkup::format().
*/
function format_string($string, array $args) {
return SafeMarkup::format($string, $args);
}
/**
* Checks whether a string is valid UTF-8.
*
* All functions designed to filter input should use drupal_validate_utf8
* to ensure they operate on valid UTF-8 strings to prevent bypass of the
* filter.
*
* When text containing an invalid UTF-8 lead byte (0xC0 - 0xFF) is presented
* as UTF-8 to Internet Explorer 6, the program may misinterpret subsequent
* bytes. When these subsequent bytes are HTML control characters such as
* quotes or angle brackets, parts of the text that were deemed safe by filters
* end up in locations that are potentially unsafe; An onerror attribute that
* is outside of a tag, and thus deemed safe by a filter, can be interpreted
* by the browser as if it were inside the tag.
*
* The function does not return FALSE for strings containing character codes
* above U+10FFFF, even though these are prohibited by RFC 3629.
*
* @param $text
* The text to check. *
* @return
* TRUE if the text is valid UTF-8, FALSE if not.
*
* @see \Drupal\Component\Utility\Unicode::validateUtf8()
*
* @deprecated in Drupal 8.0.0, will be removed before Drupal 9.0.0.
* Use \Drupal\Component\Utility\Unicode::validateUtf8().
*/
function drupal_validate_utf8($text) {
return Unicode::validateUtf8($text);
}
/**
* Logs an exception.
*
* This is a wrapper logging function which automatically decodes an exception.
*
* @param $type
* The category to which this message belongs.
* @param $exception
* The exception that is going to be logged.
* @param $message
* The message to store in the log. If empty, a text that contains all useful
* information about the passed-in exception is used.
* @param $variables
* Array of variables to replace in the message on display or
* NULL if message is already translated or not possible to
* translate.
* @param $severity
* The severity of the message, as per RFC 3164.
* @param $link
* A link to associate with the message.
*
* @see \Drupal\Core\Utility\Error::decodeException()
*/
function watchdog_exception($type, Exception $exception, $message = NULL, $variables = array(), $severity = RfcLogLevel::ERROR, $link = NULL) {
// Use a default value if $message is not set.
if (empty($message)) {
$message = '%type: @message in %function (line %line of %file).';
}
if ($link) {
$variables['link'] = $link;
}
$variables += Error::decodeException($exception);
\Drupal::logger($type)->log($severity, $message, $variables);
}
/**
* Sets a message to display to the user.
*
* Messages are stored in a session variable and displayed in the page template
* via the $messages theme variable.
*
* Example usage:
* @code
* drupal_set_message(t('An error occurred and processing did not complete.'), 'error');
* @endcode
*
* @param string|\Drupal\Component\Render\MarkupInterface $message
* (optional) The translated message to be displayed to the user. For
* consistency with other messages, it should begin with a capital letter and
* end with a period.
* @param string $type
* (optional) The message's type. Defaults to 'status'. These values are
* supported: * - 'status'
* - 'warning'
* - 'error'
* @param bool $repeat
* (optional) If this is FALSE and the message is already set, then the
* message won't be repeated. Defaults to FALSE.
*
* @return array|null
* A multidimensional array with keys corresponding to the set message types.
* The indexed array values of each contain the set messages for that type,
* and each message is an associative array with the following format:
* - safe: Boolean indicating whether the message string has been marked as
* safe. Non-safe strings will be escaped automatically.
* - message: The message string.
* So, the following is an example of the full return array structure:
* @code
* array(
* 'status' => array(
* array(
* 'safe' => TRUE,
* 'message' => 'A <em>safe</em> markup string.',
* ),
* array(
* 'safe' => FALSE,
* 'message' => "$arbitrary_user_input to escape.",
* ),
* ),
* );
* @endcode
* If there are no messages set, the function returns NULL.
*
* @see drupal_get_messages()
* @see status-messages.html.twig
*/
function drupal_set_message($message = NULL, $type = 'status', $repeat = FALSE) {
if (isset($message)) {
if (!isset($_SESSION['messages'][$type])) {
$_SESSION['messages'][$type] = array();
}
// Convert strings which are safe to the simplest Markup objects.
if (!($message instanceof Markup) && SafeMarkup::isSafe($message)) {
$message = Markup::create((string) $message);
}
// Do not use strict type checking so that equivalent string and
// MarkupInterface objects are detected.
if ($repeat || !in_array($message, $_SESSION['messages'][$type])) {
$_SESSION['messages'][$type][] = $message;
}
// Mark this page as being uncacheable.
\Drupal::service('page_cache_kill_switch')->trigger();
}
// Messages not set when DB connection fails.
return isset($_SESSION['messages']) ? $_SESSION['messages'] : NULL;
}
/**
* Returns all messages that have been set with drupal_set_message().
*
* @param string $type
* (optional) Limit the messages returned by type. Defaults to NULL, meaning
* all types. These values are supported:
* - NULL
* - 'status'
* - 'warning'
* - 'error'
* @param bool $clear_queue * (optional) If this is TRUE, the queue will be cleared of messages of the
* type specified in the $type parameter. Otherwise the queue will be left
* intact. Defaults to TRUE.
*
* @return array
* An associative, nested array of messages grouped by message type, with
* the top-level keys as the message type. The messages returned are
* limited to the type specified in the $type parameter, if any. If there
* are no messages of the specified type, an empty array is returned. See
* drupal_set_message() for the array structure of individual messages.
*
* @see drupal_set_message()
* @see status-messages.html.twig
*/
function drupal_get_messages($type = NULL, $clear_queue = TRUE) {
if ($messages = drupal_set_message()) {
if ($type) {
if ($clear_queue) {
unset($_SESSION['messages'][$type]);
}
if (isset($messages[$type])) {
return array($type => $messages[$type]);
}
}
else {
if ($clear_queue) {
unset($_SESSION['messages']);
}
return $messages;
}
}
return array();
}
/**
* Returns the time zone of the current user.
*/
function drupal_get_user_timezone() {
$user = \Drupal::currentUser();
$config = \Drupal::config('system.date');
if ($user && $config->get('timezone.user.configurable') && $user->isAuthenticated() && $user->getTimezone()) {
return $user->getTimezone();
}
else {
// Ignore PHP strict notice if time zone has not yet been set in the php.ini
// configuration.
$config_data_default_timezone = $config->get('timezone.default');
return !empty($config_data_default_timezone) ? $config_data_default_timezone : @date_default_timezone_get();
}
}
/**
* Provides custom PHP error handling.
*
* @param $error_level
* The level of the error raised.
* @param $message
* The error message.
* @param $filename
* The filename that the error was raised in.
* @param $line
* The line number the error was raised at.
* @param $context
* An array that points to the active symbol table at the point the error
* occurred.
*/
function _drupal_error_handler($error_level, $message, $filename, $line, $context) {
require_once __DIR__ . '/errors.inc';
_drupal_error_handler_real($error_level, $message, $filename, $line, $context);}
/**
* Provides custom PHP exception handling.
*
* Uncaught exceptions are those not enclosed in a try/catch block. They are
* always fatal: the execution of the script will stop as soon as the exception
* handler exits.
*
* @param \Exception|\Throwable $exception
* The exception object that was thrown.
*/
function _drupal_exception_handler($exception) {
require_once __DIR__ . '/errors.inc';
try {
// Log the message to the watchdog and return an error page to the user.
_drupal_log_error(Error::decodeException($exception), TRUE);
}
// PHP 7 introduces Throwable, which covers both Error and
// Exception throwables.
catch (\Throwable $error) {
_drupal_exception_handler_additional($exception, $error);
}
// In order to be compatibile with PHP 5 we also catch regular Exceptions.
catch (\Exception $exception2) {
_drupal_exception_handler_additional($exception, $exception2);
}
}
/**
* Displays any additional errors caught while handling an exception.
*
* @param \Exception|\Throwable $exception
* The first exception object that was thrown.
* @param \Exception|\Throwable $exception2
* The second exception object that was thrown.
*/
function _drupal_exception_handler_additional($exception, $exception2) {
// Another uncaught exception was thrown while handling the first one.
// If we are displaying errors, then do so with no possibility of a further
// uncaught exception being thrown.
if (error_displayable()) {
print '<h1>Additional uncaught exception thrown while handling exception.</h1>';
print '<h2>Original</h2><p>' . Error::renderExceptionSafe($exception) . '</p>';
print '<h2>Additional</h2><p>' . Error::renderExceptionSafe($exception2) . '</p><hr />';
}
}
/**
* Returns the test prefix if this is an internal request from SimpleTest.
*
* @param string $new_prefix
* Internal use only. A new prefix to be stored.
*
* @return string|FALSE
* Either the simpletest prefix (the string "simpletest" followed by any
* number of digits) or FALSE if the user agent does not contain a valid
* HMAC and timestamp.
*/
function drupal_valid_test_ua($new_prefix = NULL) {
static $test_prefix;
if (isset($new_prefix)) {
$test_prefix = $new_prefix;
}
if (isset($test_prefix)) {
return $test_prefix;
}
// Unless the below User-Agent and HMAC validation succeeds, we are not in // a test environment.
$test_prefix = FALSE;
// A valid Simpletest request will contain a hashed and salted authentication
// code. Check if this code is present in a cookie or custom user agent
// string.
$http_user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : NULL;
$user_agent = isset($_COOKIE['SIMPLETEST_USER_AGENT']) ? $_COOKIE['SIMPLETEST_USER_AGENT'] : $http_user_agent;
if (isset($user_agent) && preg_match("/^(simpletest\d+);(.+);(.+);(.+)$/", $user_agent, $matches)) {
list(, $prefix, $time, $salt, $hmac) = $matches;
$check_string = $prefix . ';' . $time . ';' . $salt;
// Read the hash salt prepared by drupal_generate_test_ua().
// This function is called before settings.php is read and Drupal's error
// handlers are set up. While Drupal's error handling may be properly
// configured on production sites, the server's PHP error_reporting may not.
// Ensure that no information leaks on production sites.
$key_file = DRUPAL_ROOT . '/sites/simpletest/' . substr($prefix, 10) . '/.htkey';
if (!is_readable($key_file)) {
header($_SERVER['SERVER_PROTOCOL'] . ' 403 Forbidden');
exit;
}
$private_key = file_get_contents($key_file);
// The file properties add more entropy not easily accessible to others.
$key = $private_key . filectime(__FILE__) . fileinode(__FILE__);
$time_diff = REQUEST_TIME - $time;
$test_hmac = Crypt::hmacBase64($check_string, $key);
// Since we are making a local request a 5 second time window is allowed,
// and the HMAC must match.
if ($time_diff >= 0 && $time_diff <= 5 && $hmac === $test_hmac) {
$test_prefix = $prefix;
}
}
return $test_prefix;
}
/**
* Generates a user agent string with a HMAC and timestamp for simpletest.
*/
function drupal_generate_test_ua($prefix) {
static $key, $last_prefix;
if (!isset($key) || $last_prefix != $prefix) {
$last_prefix = $prefix;
$key_file = DRUPAL_ROOT . '/sites/simpletest/' . substr($prefix, 10) . '/.htkey';
// When issuing an outbound HTTP client request from within an inbound test
// request, then the outbound request has to use the same User-Agent header
// as the inbound request. A newly generated private key for the same test
// prefix would invalidate all subsequent inbound requests.
// @see \Drupal\Core\Http\Plugin\SimpletestHttpRequestSubscriber
if (DRUPAL_TEST_IN_CHILD_SITE && $parent_prefix = drupal_valid_test_ua()) {
if ($parent_prefix != $prefix) {
throw new \RuntimeException("Malformed User-Agent: Expected '$parent_prefix' but got '$prefix'.");
}
// If the file is not readable, a PHP warning is expected in this case.
$private_key = file_get_contents($key_file);
}
else {
// Generate and save a new hash salt for a test run.
// Consumed by drupal_valid_test_ua() before settings.php is loaded.
$private_key = Crypt::randomBytesBase64(55);
file_put_contents($key_file, $private_key);
}
// The file properties add more entropy not easily accessible to others.
$key = $private_key . filectime(__FILE__) . fileinode(__FILE__);
}
// Generate a moderately secure HMAC based on the database credentials.
$salt = uniqid('', TRUE);
$check_string = $prefix . ';' . time() . ';' . $salt;
return $check_string . ';' . Crypt::hmacBase64($check_string, $key);
}
/**
* Enables use of the theme system without requiring database access.
*
* Loads and initializes the theme system for site installs, updates and when
* the site is in maintenance mode. This also applies when the database fails.
*
* @see _drupal_maintenance_theme()
*/
function drupal_maintenance_theme() {
require_once __DIR__ . '/theme.maintenance.inc';
_drupal_maintenance_theme();
}
/**
* Returns TRUE if a Drupal installation is currently being attempted.
*/
function drupal_installation_attempted() {
// This cannot rely on the MAINTENANCE_MODE constant, since that would prevent
// tests from using the non-interactive installer, in which case Drupal
// only happens to be installed within the same request, but subsequently
// executed code does not involve the installer at all.
// @see install_drupal()
return isset($GLOBALS['install_state']) && empty($GLOBALS['install_state']['installation_finished']);
}
/**
* Gets the name of the currently active installation profile.
*
* When this function is called during Drupal's initial installation process,
* the name of the profile that's about to be installed is stored in the global
* installation state. At all other times, the "install_profile" setting will be
* available in settings.php.
*
* @return string|null $profile
* The name of the installation profile or NULL if no installation profile is
* currently active. This is the case for example during the first steps of
* the installer or during unit tests.
*/
function drupal_get_profile() {
global $install_state;
if (drupal_installation_attempted()) {
// If the profile has been selected return it.
if (isset($install_state['parameters']['profile'])) {
$profile = $install_state['parameters']['profile'];
}
else {
$profile = NULL;
}
}
else {
// Fall back to NULL, if there is no 'install_profile' setting.
$profile = Settings::get('install_profile');
}
return $profile;
}
/**
* Registers an additional namespace.
*
* @param string $name
* The namespace component to register; e.g., 'node'.
* @param string $path
* The relative path to the Drupal component in the filesystem.
*/
function drupal_classloader_register($name, $path) {
$loader = \Drupal::service('class_loader');
$loader->addPsr4('Drupal\\' . $name . '\\', \Drupal::root() . '/' . $path . '/src');}
/**
* Provides central static variable storage.
*
* All functions requiring a static variable to persist or cache data within
* a single page request are encouraged to use this function unless it is
* absolutely certain that the static variable will not need to be reset during
* the page request. By centralizing static variable storage through this
* function, other functions can rely on a consistent API for resetting any
* other function's static variables.
*
* Example:
* @code
* function example_list($field = 'default') {
* $examples = &drupal_static(__FUNCTION__);
* if (!isset($examples)) {
* // If this function is being called for the first time after a reset,
* // query the database and execute any other code needed to retrieve
* // information.
* ...
* }
* if (!isset($examples[$field])) {
* // If this function is being called for the first time for a particular
* // index field, then execute code needed to index the information already
* // available in $examples by the desired field.
* ...
* }
* // Subsequent invocations of this function for a particular index field
* // skip the above two code blocks and quickly return the already indexed
* // information.
* return $examples[$field];
* }
* function examples_admin_overview() {
* // When building the content for the overview page, make sure to get
* // completely fresh information.
* drupal_static_reset('example_list');
* ...
* }
* @endcode
*
* In a few cases, a function can have certainty that there is no legitimate
* use-case for resetting that function's static variable. This is rare,
* because when writing a function, it's hard to forecast all the situations in
* which it will be used. A guideline is that if a function's static variable
* does not depend on any information outside of the function that might change
* during a single page request, then it's ok to use the "static" keyword
* instead of the drupal_static() function.
*
* Example:
* @code
* function mymodule_log_stream_handle($new_handle = NULL) {
* static $handle;
* if (isset($new_handle)) {
* $handle = $new_handle;
* }
* return $handle;
* }
* @endcode
*
* In a few cases, a function needs a resettable static variable, but the
* function is called many times (100+) during a single page request, so
* every microsecond of execution time that can be removed from the function
* counts. These functions can use a more cumbersome, but faster variant of
* calling drupal_static(). It works by storing the reference returned by
* drupal_static() in the calling function's own static variable, thereby
* removing the need to call drupal_static() for each iteration of the function.
* Conceptually, it replaces:
* @code
* $foo = &drupal_static(__FUNCTION__); * @endcode
* with:
* @code
* // Unfortunately, this does not work.
* static $foo = &drupal_static(__FUNCTION__);
* @endcode
* However, the above line of code does not work, because PHP only allows static
* variables to be initialized by literal values, and does not allow static
* variables to be assigned to references.
* - http://php.net/manual/language.variables.scope.php#language.variables.scope.static
* - http://php.net/manual/language.variables.scope.php#language.variables.scope.references
* The example below shows the syntax needed to work around both limitations.
* For benchmarks and more information, see https://www.drupal.org/node/619666.
*
* Example:
* @code
* function example_default_format_type() {
* // Use the advanced drupal_static() pattern, since this is called very often.
* static $drupal_static_fast;
* if (!isset($drupal_static_fast)) {
* $drupal_static_fast['format_type'] = &drupal_static(__FUNCTION__);
* }
* $format_type = &$drupal_static_fast['format_type'];
* ...
* }
* @endcode
*
* @param $name
* Globally unique name for the variable. For a function with only one static,
* variable, the function name (e.g. via the PHP magic __FUNCTION__ constant)
* is recommended. For a function with multiple static variables add a
* distinguishing suffix to the function name for each one.
* @param $default_value
* Optional default value.
* @param $reset
* TRUE to reset one or all variables(s). This parameter is only used
* internally and should not be passed in; use drupal_static_reset() instead.
* (This function's return value should not be used when TRUE is passed in.)
*
* @return
* Returns a variable by reference.
*
* @see drupal_static_reset()
*/
function &drupal_static($name, $default_value = NULL, $reset = FALSE) {
static $data = array(), $default = array();
// First check if dealing with a previously defined static variable.
if (isset($data[$name]) || array_key_exists($name, $data)) {
// Non-NULL $name and both $data[$name] and $default[$name] statics exist.
if ($reset) {
// Reset pre-existing static variable to its default value.
$data[$name] = $default[$name];
}
return $data[$name];
}
// Neither $data[$name] nor $default[$name] static variables exist.
if (isset($name)) {
if ($reset) {
// Reset was called before a default is set and yet a variable must be
// returned.
return $data;
}
// First call with new non-NULL $name. Initialize a new static variable.
$default[$name] = $data[$name] = $default_value;
return $data[$name];
}
// Reset all: ($name == NULL). This needs to be done one at a time so that
// references returned by earlier invocations of drupal_static() also get
// reset.
foreach ($default as $name => $value) { $data[$name] = $value;
}
// As the function returns a reference, the return should always be a
// variable.
return $data;
}
/**
* Resets one or all centrally stored static variable(s).
*
* @param $name
* Name of the static variable to reset. Omit to reset all variables.
* Resetting all variables should only be used, for example, for running
* unit tests with a clean environment.
*/
function drupal_static_reset($name = NULL) {
drupal_static($name, NULL, TRUE);
}
/**
* Formats text for emphasized display in a placeholder inside a sentence.
*
* @deprecated in Drupal 8.0.0, will be removed before Drupal 9.0.0. Use
* \Drupal\Component\Utility\SafeMarkup::format() or Twig's "placeholder"
* filter instead. Note this method should not be used to simply emphasize a
* string and therefore has few valid use-cases. Note also, that this method
* does not mark the string as safe.
*
* @see \Drupal\Component\Utility\SafeMarkup::format()
*/
function drupal_placeholder($text) {
return '<em class="placeholder">' . Html::escape($text) . '</em>';
}
/**
* Registers a function for execution on shutdown.
*
* Wrapper for register_shutdown_function() that catches thrown exceptions to
* avoid "Exception thrown without a stack frame in Unknown".
*
* @param $callback
* The shutdown function to register.
* @param ...
* Additional arguments to pass to the shutdown function.
*
* @return
* Array of shutdown functions to be executed.
*
* @see register_shutdown_function()
* @ingroup php_wrappers
*/
function &drupal_register_shutdown_function($callback = NULL) {
// We cannot use drupal_static() here because the static cache is reset during
// batch processing, which breaks batch handling.
static $callbacks = array();
if (isset($callback)) {
// Only register the internal shutdown function once.
if (empty($callbacks)) {
register_shutdown_function('_drupal_shutdown_function');
}
$args = func_get_args();
// Remove $callback from the arguments.
unset($args[0]);
// Save callback and arguments
$callbacks[] = array('callback' => $callback, 'arguments' => $args);
}
return $callbacks;
}
/**
* Executes registered shutdown functions.
*/
function _drupal_shutdown_function() {
$callbacks = &drupal_register_shutdown_function();
// Set the CWD to DRUPAL_ROOT as it is not guaranteed to be the same as it
// was in the normal context of execution.
chdir(DRUPAL_ROOT);
try {
while (list($key, $callback) = each($callbacks)) {
call_user_func_array($callback['callback'], $callback['arguments']);
}
}
// PHP 7 introduces Throwable, which covers both Error and
// Exception throwables.
catch (\Throwable $error) {
_drupal_shutdown_function_handle_exception($error);
}
// In order to be compatibile with PHP 5 we also catch regular Exceptions.
catch (\Exception $exception) {
_drupal_shutdown_function_handle_exception($exception);
}
}
/**
* Displays and logs any errors that may happen during shutdown.
*
* @param \Exception|\Throwable $exception
* The exception object that was thrown.
*
* @see _drupal_shutdown_function()
*/
function _drupal_shutdown_function_handle_exception($exception) {
// If using PHP-FPM then fastcgi_finish_request() will have been fired
// preventing further output to the browser.
if (!function_exists('fastcgi_finish_request')) {
// If we are displaying errors, then do so with no possibility of a
// further uncaught exception being thrown.
require_once __DIR__ . '/errors.inc';
if (error_displayable()) {
print '<h1>Uncaught exception thrown in shutdown function.</h1>';
print '<p>' . Error::renderExceptionSafe($exception) . '</p><hr />';
}
}
error_log($exception);
}