bootstrap.inc 117 KB
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<?php
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/**
 * @file
 * Functions that need to be loaded on every Drupal request.
 */
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/**
 * The current system version.
 */
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define('VERSION', '7.33-dev');
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/**
 * Core API compatibility.
 */
define('DRUPAL_CORE_COMPATIBILITY', '7.x');

/**
 * Minimum supported version of PHP.
 */
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define('DRUPAL_MINIMUM_PHP', '5.2.4');
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/**
 * Minimum recommended value of PHP memory_limit.
 */
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define('DRUPAL_MINIMUM_PHP_MEMORY_LIMIT', '32M');
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/**
 * Error reporting level: display no errors.
 */
define('ERROR_REPORTING_HIDE', 0);

/**
 * Error reporting level: display errors and warnings.
 */
define('ERROR_REPORTING_DISPLAY_SOME', 1);

/**
 * Error reporting level: display all messages.
 */
define('ERROR_REPORTING_DISPLAY_ALL', 2);

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/**
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 * Indicates that the item should never be removed unless explicitly selected.
 *
 * The item may be removed using cache_clear_all() with a cache ID.
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 */
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define('CACHE_PERMANENT', 0);
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/**
 * Indicates that the item should be removed at the next general cache wipe.
 */
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define('CACHE_TEMPORARY', -1);
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/**
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 * @defgroup logging_severity_levels Logging severity levels
 * @{
 * Logging severity levels as defined in RFC 3164.
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 *
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 * The WATCHDOG_* constant definitions correspond to the logging severity levels
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 * defined in RFC 3164, section 4.1.1. PHP supplies predefined LOG_* constants
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 * for use in the syslog() function, but their values on Windows builds do not
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 * correspond to RFC 3164. The associated PHP bug report was closed with the
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 * comment, "And it's also not a bug, as Windows just have less log levels,"
 * and "So the behavior you're seeing is perfectly normal."
 *
 * @see http://www.faqs.org/rfcs/rfc3164.html
 * @see http://bugs.php.net/bug.php?id=18090
 * @see http://php.net/manual/function.syslog.php
 * @see http://php.net/manual/network.constants.php
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 * @see watchdog()
 * @see watchdog_severity_levels()
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 */
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/**
 * Log message severity -- Emergency: system is unusable.
 */
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define('WATCHDOG_EMERGENCY', 0);
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/**
 * Log message severity -- Alert: action must be taken immediately.
 */
define('WATCHDOG_ALERT', 1);

/**
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 * Log message severity -- Critical conditions.
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 */
define('WATCHDOG_CRITICAL', 2);

/**
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 * Log message severity -- Error conditions.
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 */
define('WATCHDOG_ERROR', 3);

/**
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 * Log message severity -- Warning conditions.
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 */
define('WATCHDOG_WARNING', 4);

/**
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 * Log message severity -- Normal but significant conditions.
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 */
define('WATCHDOG_NOTICE', 5);

/**
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 * Log message severity -- Informational messages.
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 */
define('WATCHDOG_INFO', 6);

/**
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 * Log message severity -- Debug-level messages.
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 */
define('WATCHDOG_DEBUG', 7);
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/**
 * @} End of "defgroup logging_severity_levels".
 */

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/**
 * First bootstrap phase: initialize configuration.
 */
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define('DRUPAL_BOOTSTRAP_CONFIGURATION', 0);
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/**
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 * Second bootstrap phase: try to serve a cached page.
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 */
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define('DRUPAL_BOOTSTRAP_PAGE_CACHE', 1);
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/**
 * Third bootstrap phase: initialize database layer.
 */
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define('DRUPAL_BOOTSTRAP_DATABASE', 2);
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/**
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 * Fourth bootstrap phase: initialize the variable system.
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 */
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define('DRUPAL_BOOTSTRAP_VARIABLES', 3);
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/**
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 * Fifth bootstrap phase: initialize session handling.
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 */
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define('DRUPAL_BOOTSTRAP_SESSION', 4);
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/**
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 * Sixth bootstrap phase: set up the page header.
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 */
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define('DRUPAL_BOOTSTRAP_PAGE_HEADER', 5);
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/**
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 * Seventh bootstrap phase: find out language of the page.
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 */
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define('DRUPAL_BOOTSTRAP_LANGUAGE', 6);
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/**
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 * Final bootstrap phase: Drupal is fully loaded; validate and fix input data.
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 */
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define('DRUPAL_BOOTSTRAP_FULL', 7);
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/**
 * Role ID for anonymous users; should match what's in the "role" table.
 */
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define('DRUPAL_ANONYMOUS_RID', 1);
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/**
 * Role ID for authenticated users; should match what's in the "role" table.
 */
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define('DRUPAL_AUTHENTICATED_RID', 2);

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/**
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 * The number of bytes in a kilobyte.
 *
 * For more information, visit http://en.wikipedia.org/wiki/Kilobyte.
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 */
define('DRUPAL_KILOBYTE', 1024);

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/**
 * The language code used when no language is explicitly assigned.
 *
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 * Defined by ISO639-2 for "Undetermined".
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 */
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define('LANGUAGE_NONE', 'und');
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/**
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 * The type of language used to define the content language.
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 */
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define('LANGUAGE_TYPE_CONTENT', 'language_content');
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/**
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 * The type of language used to select the user interface.
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 */
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define('LANGUAGE_TYPE_INTERFACE', 'language');
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/**
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 * The type of language used for URLs.
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 */
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define('LANGUAGE_TYPE_URL', 'language_url');
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/**
 * Language written left to right. Possible value of $language->direction.
 */
define('LANGUAGE_LTR', 0);

/**
 * Language written right to left. Possible value of $language->direction.
 */
define('LANGUAGE_RTL', 1);

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/**
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 * Time of the current request in seconds elapsed since the Unix Epoch.
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 *
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 * 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
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 */
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define('REQUEST_TIME', (int) $_SERVER['REQUEST_TIME']);
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/**
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 * Flag used to indicate that text is not sanitized, so run check_plain().
 *
 * @see drupal_set_title()
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 */
define('CHECK_PLAIN', 0);

/**
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 * Flag used to indicate that text has already been sanitized.
 *
 * @see drupal_set_title()
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 */
define('PASS_THROUGH', -1);

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/**
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 * Signals that the registry lookup cache should be reset.
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 */
define('REGISTRY_RESET_LOOKUP_CACHE', 1);

/**
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 * Signals that the registry lookup cache should be written to storage.
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 */
define('REGISTRY_WRITE_LOOKUP_CACHE', 2);

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/**
 * Regular expression to match PHP function names.
 *
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 * @see http://php.net/manual/language.functions.php
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 */
define('DRUPAL_PHP_FUNCTION_PATTERN', '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*');

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/**
 * A RFC7231 Compliant date.
 *
 * http://tools.ietf.org/html/rfc7231#section-7.1.1.1
 *
 * Example: Sun, 06 Nov 1994 08:49:37 GMT
 */
define('DATE_RFC7231', 'D, d M Y H:i:s \G\M\T');

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/**
 * Provides a caching wrapper to be used in place of large array structures.
 *
 * This class should be extended by systems that need to cache large amounts
 * of data and have it represented as an array to calling functions. These
 * arrays can become very large, so ArrayAccess is used to allow different
 * strategies to be used for caching internally (lazy loading, building caches
 * over time etc.). This can dramatically reduce the amount of data that needs
 * to be loaded from cache backends on each request, and memory usage from
 * static caches of that same data.
 *
 * Note that array_* functions do not work with ArrayAccess. Systems using
 * DrupalCacheArray should use this only internally. If providing API functions
 * that return the full array, this can be cached separately or returned
 * directly. However since DrupalCacheArray holds partial content by design, it
 * should be a normal PHP array or otherwise contain the full structure.
 *
 * Note also that due to limitations in PHP prior to 5.3.4, it is impossible to
 * write directly to the contents of nested arrays contained in this object.
 * Only writes to the top-level array elements are possible. So if you
 * previously had set $object['foo'] = array(1, 2, 'bar' => 'baz'), but later
 * want to change the value of 'bar' from 'baz' to 'foobar', you cannot do so
 * a targeted write like $object['foo']['bar'] = 'foobar'. Instead, you must
 * overwrite the entire top-level 'foo' array with the entire set of new
 * values: $object['foo'] = array(1, 2, 'bar' => 'foobar'). Due to this same
 * limitation, attempts to create references to any contained data, nested or
 * otherwise, will fail silently. So $var = &$object['foo'] will not throw an
 * error, and $var will be populated with the contents of $object['foo'], but
 * that data will be passed by value, not reference. For more information on
 * the PHP limitation, see the note in the official PHP documentation at·
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 * http://php.net/manual/arrayaccess.offsetget.php on
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 * ArrayAccess::offsetGet().
 *
 * By default, the class accounts for caches where calling functions might
 * request keys in the array that won't exist even after a cache rebuild. This
 * prevents situations where a cache rebuild would be triggered over and over
 * due to a 'missing' item. These cases are stored internally as a value of
 * NULL. This means that the offsetGet() and offsetExists() methods
 * must be overridden if caching an array where the top level values can
 * legitimately be NULL, and where $object->offsetExists() needs to correctly
 * return (equivalent to array_key_exists() vs. isset()). This should not
 * be necessary in the majority of cases.
 *
 * Classes extending this class must override at least the
 * resolveCacheMiss() method to have a working implementation.
 *
 * offsetSet() is not overridden by this class by default. In practice this
 * means that assigning an offset via arrayAccess will only apply while the
 * object is in scope and will not be written back to the persistent cache.
 * This follows a similar pattern to static vs. persistent caching in
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 * procedural code. Extending classes may wish to alter this behavior, for
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 * example by overriding offsetSet() and adding an automatic call to persist().
 *
 * @see SchemaCache
 */
abstract class DrupalCacheArray implements ArrayAccess {

  /**
   * A cid to pass to cache_set() and cache_get().
   */
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  protected $cid;
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  /**
   * A bin to pass to cache_set() and cache_get().
   */
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  protected $bin;
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  /**
   * An array of keys to add to the cache at the end of the request.
   */
  protected $keysToPersist = array();

  /**
   * Storage for the data itself.
   */
  protected $storage = array();

  /**
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   * Constructs a DrupalCacheArray object.
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   *
   * @param $cid
   *   The cid for the array being cached.
   * @param $bin
   *   The bin to cache the array.
   */
  public function __construct($cid, $bin) {
    $this->cid = $cid;
    $this->bin = $bin;

    if ($cached = cache_get($this->cid, $this->bin)) {
     $this->storage = $cached->data;
    }
  }

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  /**
   * Implements ArrayAccess::offsetExists().
   */
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  public function offsetExists($offset) {
    return $this->offsetGet($offset) !== NULL;
  }

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  /**
   * Implements ArrayAccess::offsetGet().
   */
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  public function offsetGet($offset) {
    if (isset($this->storage[$offset]) || array_key_exists($offset, $this->storage)) {
      return $this->storage[$offset];
    }
    else {
      return $this->resolveCacheMiss($offset);
    }
  }

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  /**
   * Implements ArrayAccess::offsetSet().
   */
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  public function offsetSet($offset, $value) {
    $this->storage[$offset] = $value;
  }

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  /**
   * Implements ArrayAccess::offsetUnset().
   */
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  public function offsetUnset($offset) {
    unset($this->storage[$offset]);
  }

  /**
   * Flags an offset value to be written to the persistent cache.
   *
   * If a value is assigned to a cache object with offsetSet(), by default it
   * will not be written to the persistent cache unless it is flagged with this
   * method. This allows items to be cached for the duration of a request,
   * without necessarily writing back to the persistent cache at the end.
   *
   * @param $offset
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   *   The array offset that was requested.
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   * @param $persist
   *   Optional boolean to specify whether the offset should be persisted or
   *   not, defaults to TRUE. When called with $persist = FALSE the offset will
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   *   be unflagged so that it will not be written at the end of the request.
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   */
  protected function persist($offset, $persist = TRUE) {
    $this->keysToPersist[$offset] = $persist;
  }

  /**
   * Resolves a cache miss.
   *
   * When an offset is not found in the object, this is treated as a cache
   * miss. This method allows classes implementing the interface to look up
   * the actual value and allow it to be cached.
   *
   * @param $offset
   *   The offset that was requested.
   *
   * @return
   *   The value of the offset, or NULL if no value was found.
   */
  abstract protected function resolveCacheMiss($offset);

  /**
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   * Writes a value to the persistent cache immediately.
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   *
   * @param $data
   *   The data to write to the persistent cache.
   * @param $lock
   *   Whether to acquire a lock before writing to cache.
   */
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  protected function set($data, $lock = TRUE) {
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    // Lock cache writes to help avoid stampedes.
    // To implement locking for cache misses, override __construct().
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    $lock_name = $this->cid . ':' . $this->bin;
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    if (!$lock || lock_acquire($lock_name)) {
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      if ($cached = cache_get($this->cid, $this->bin)) {
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        $data = $cached->data + $data;
      }
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      cache_set($this->cid, $data, $this->bin);
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      if ($lock) {
        lock_release($lock_name);
      }
    }
  }

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  /**
   * Destructs the DrupalCacheArray object.
   */
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  public function __destruct() {
    $data = array();
    foreach ($this->keysToPersist as $offset => $persist) {
      if ($persist) {
        $data[$offset] = $this->storage[$offset];
      }
    }
    if (!empty($data)) {
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      $this->set($data);
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    }
  }
}

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/**
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 * Starts the timer with the specified name.
 *
 * If you start and stop the same timer multiple times, the measured intervals
 * will be accumulated.
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 *
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 * @param $name
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 *   The name of the timer.
 */
function timer_start($name) {
  global $timers;

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  $timers[$name]['start'] = microtime(TRUE);
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  $timers[$name]['count'] = isset($timers[$name]['count']) ? ++$timers[$name]['count'] : 1;
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}

/**
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 * Reads the current timer value without stopping the timer.
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 *
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 * @param $name
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 *   The name of the timer.
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 *
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 * @return
 *   The current timer value in ms.
 */
function timer_read($name) {
  global $timers;

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  if (isset($timers[$name]['start'])) {
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    $stop = microtime(TRUE);
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    $diff = round(($stop - $timers[$name]['start']) * 1000, 2);
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    if (isset($timers[$name]['time'])) {
      $diff += $timers[$name]['time'];
    }
    return $diff;
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  }
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  return $timers[$name]['time'];
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}

/**
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 * Stops the timer with the specified name.
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 *
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 * @param $name
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 *   The name of the timer.
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 *
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 * @return
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 *   A timer array. The array contains the number of times the timer has been
 *   started and stopped (count) and the accumulated timer value in ms (time).
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 */
function timer_stop($name) {
  global $timers;

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  if (isset($timers[$name]['start'])) {
    $stop = microtime(TRUE);
    $diff = round(($stop - $timers[$name]['start']) * 1000, 2);
    if (isset($timers[$name]['time'])) {
      $timers[$name]['time'] += $diff;
    }
    else {
      $timers[$name]['time'] = $diff;
    }
    unset($timers[$name]['start']);
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  }
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  return $timers[$name];
}
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/**
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 * Returns the appropriate configuration directory.
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 *
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 * Returns the configuration path based on the site's hostname, port, and
 * pathname. Uses find_conf_path() to find the current configuration directory.
 * See default.settings.php for examples on how the URL is converted to a
 * directory.
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 *
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 * @param bool $require_settings
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 *   Only configuration directories with an existing settings.php file
 *   will be recognized. Defaults to TRUE. During initial installation,
 *   this is set to FALSE so that Drupal can detect a matching directory,
 *   then create a new settings.php file in it.
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 * @param bool $reset
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 *   Force a full search for matching directories even if one had been
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 *   found previously. Defaults to FALSE.
 *
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 * @return
 *   The path of the matching directory.
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 *
 * @see default.settings.php
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 */
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function conf_path($require_settings = TRUE, $reset = FALSE) {
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  $conf = &drupal_static(__FUNCTION__, '');
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  if ($conf && !$reset) {
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    return $conf;
  }
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  $confdir = 'sites';
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  $sites = array();
  if (file_exists(DRUPAL_ROOT . '/' . $confdir . '/sites.php')) {
    // This will overwrite $sites with the desired mappings.
    include(DRUPAL_ROOT . '/' . $confdir . '/sites.php');
  }

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  $uri = explode('/', $_SERVER['SCRIPT_NAME'] ? $_SERVER['SCRIPT_NAME'] : $_SERVER['SCRIPT_FILENAME']);
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  $server = explode('.', implode('.', array_reverse(explode(':', rtrim($_SERVER['HTTP_HOST'], '.')))));
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  for ($i = count($uri) - 1; $i > 0; $i--) {
    for ($j = count($server); $j > 0; $j--) {
      $dir = implode('.', array_slice($server, -$j)) . implode('.', array_slice($uri, 0, $i));
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      if (isset($sites[$dir]) && file_exists(DRUPAL_ROOT . '/' . $confdir . '/' . $sites[$dir])) {
        $dir = $sites[$dir];
      }
      if (file_exists(DRUPAL_ROOT . '/' . $confdir . '/' . $dir . '/settings.php') || (!$require_settings && file_exists(DRUPAL_ROOT . '/' . $confdir . '/' . $dir))) {
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        $conf = "$confdir/$dir";
        return $conf;
      }
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    }
  }
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  $conf = "$confdir/default";
  return $conf;
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}

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/**
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 * Sets appropriate server variables needed for command line scripts to work.
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 *
 * This function can be called by command line scripts before bootstrapping
 * Drupal, to ensure that the page loads with the desired server parameters.
 * This is because many parts of Drupal assume that they are running in a web
 * browser and therefore use information from the global PHP $_SERVER variable
 * that does not get set when Drupal is run from the command line.
 *
 * In many cases, the default way in which this function populates the $_SERVER
 * variable is sufficient, and it can therefore be called without passing in
 * any input. However, command line scripts running on a multisite installation
 * (or on any installation that has settings.php stored somewhere other than
 * the sites/default folder) need to pass in the URL of the site to allow
 * Drupal to detect the correct location of the settings.php file. Passing in
 * the 'url' parameter is also required for functions like request_uri() to
 * return the expected values.
 *
 * Most other parameters do not need to be passed in, but may be necessary in
 * some cases; for example, if Drupal's ip_address() function needs to return
 * anything but the standard localhost value ('127.0.0.1'), the command line
 * script should pass in the desired value via the 'REMOTE_ADDR' key.
 *
 * @param $variables
 *   (optional) An associative array of variables within $_SERVER that should
 *   be replaced. If the special element 'url' is provided in this array, it
 *   will be used to populate some of the server defaults; it should be set to
 *   the URL of the current page request, excluding any $_GET request but
 *   including the script name (e.g., http://www.example.com/mysite/index.php).
 *
 * @see conf_path()
 * @see request_uri()
 * @see ip_address()
 */
function drupal_override_server_variables($variables = array()) {
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  // Allow the provided URL to override any existing values in $_SERVER.
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  if (isset($variables['url'])) {
    $url = parse_url($variables['url']);
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    if (isset($url['host'])) {
      $_SERVER['HTTP_HOST'] = $url['host'];
    }
    if (isset($url['path'])) {
      $_SERVER['SCRIPT_NAME'] = $url['path'];
    }
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    unset($variables['url']);
  }
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  // Define default values for $_SERVER keys. These will be used if $_SERVER
  // does not already define them and no other values are passed in to this
  // function.
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  $defaults = array(
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    'HTTP_HOST' => 'localhost',
    'SCRIPT_NAME' => NULL,
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    'REMOTE_ADDR' => '127.0.0.1',
    'REQUEST_METHOD' => 'GET',
    'SERVER_NAME' => NULL,
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    'SERVER_SOFTWARE' => NULL,
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    'HTTP_USER_AGENT' => NULL,
  );
  // Replace elements of the $_SERVER array, as appropriate.
  $_SERVER = $variables + $_SERVER + $defaults;
}

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/**
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 * Initializes the PHP environment.
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 */
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function drupal_environment_initialize() {
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  if (!isset($_SERVER['HTTP_REFERER'])) {
    $_SERVER['HTTP_REFERER'] = '';
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  }
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  if (!isset($_SERVER['SERVER_PROTOCOL']) || ($_SERVER['SERVER_PROTOCOL'] != 'HTTP/1.0' && $_SERVER['SERVER_PROTOCOL'] != 'HTTP/1.1')) {
    $_SERVER['SERVER_PROTOCOL'] = 'HTTP/1.0';
  }
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  if (isset($_SERVER['HTTP_HOST'])) {
    // As HTTP_HOST is user input, ensure it only contains characters allowed
    // in hostnames. See RFC 952 (and RFC 2181).
    // $_SERVER['HTTP_HOST'] is lowercased here per specifications.
    $_SERVER['HTTP_HOST'] = strtolower($_SERVER['HTTP_HOST']);
    if (!drupal_valid_http_host($_SERVER['HTTP_HOST'])) {
      // HTTP_HOST is invalid, e.g. if containing slashes it may be an attack.
      header($_SERVER['SERVER_PROTOCOL'] . ' 400 Bad Request');
      exit;
    }
  }
  else {
    // Some pre-HTTP/1.1 clients will not send a Host header. Ensure the key is
    // defined for E_ALL compliance.
    $_SERVER['HTTP_HOST'] = '';
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  }

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  // When clean URLs are enabled, emulate ?q=foo/bar using REQUEST_URI. It is
  // not possible to append the query string using mod_rewrite without the B
  // flag (this was added in Apache 2.2.8), because mod_rewrite unescapes the
  // path before passing it on to PHP. This is a problem when the path contains
  // e.g. "&" or "%" that have special meanings in URLs and must be encoded.
  $_GET['q'] = request_path();

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  // Enforce E_ALL, but allow users to set levels not part of E_ALL.
  error_reporting(E_ALL | error_reporting());
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  // Override PHP settings required for Drupal to work properly.
  // sites/default/default.settings.php contains more runtime settings.
  // The .htaccess file contains settings that cannot be changed at runtime.
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  // Don't escape quotes when reading files from the database, disk, etc.
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  ini_set('magic_quotes_runtime', '0');
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  // Use session cookies, not transparent sessions that puts the session id in
  // the query string.
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  ini_set('session.use_cookies', '1');
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  ini_set('session.use_only_cookies', '1');
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  ini_set('session.use_trans_sid', '0');
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  // Don't send HTTP headers using PHP's session handler.
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  // An empty string is used here to disable the cache limiter.
  ini_set('session.cache_limiter', '');
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  // Use httponly session cookies.
  ini_set('session.cookie_httponly', '1');
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  // Set sane locale settings, to ensure consistent string, dates, times and
  // numbers handling.
  setlocale(LC_ALL, 'C');
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}

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/**
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 * Validates that a hostname (for example $_SERVER['HTTP_HOST']) is safe.
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 *
 * @return
 *  TRUE if only containing valid characters, or FALSE otherwise.
 */
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function drupal_valid_http_host($host) {
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  // Limit the length of the host name to 1000 bytes to prevent DoS attacks with
  // long host names.
  return strlen($host) <= 1000
    // Limit the number of subdomains and port separators to prevent DoS attacks
    // in conf_path().
    && substr_count($host, '.') <= 100
    && substr_count($host, ':') <= 100
    && preg_match('/^\[?(?:[a-zA-Z0-9-:\]_]+\.?)+$/', $host);
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}

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/**
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 * Sets the base URL, cookie domain, and session name from configuration.
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 */
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function drupal_settings_initialize() {
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  global $base_url, $base_path, $base_root;

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  // Export these settings.php variables to the global namespace.
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  global $databases, $cookie_domain, $conf, $installed_profile, $update_free_access, $db_url, $db_prefix, $drupal_hash_salt, $is_https, $base_secure_url, $base_insecure_url;
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  $conf = array();

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  if (file_exists(DRUPAL_ROOT . '/' . conf_path() . '/settings.php')) {
    include_once DRUPAL_ROOT . '/' . conf_path() . '/settings.php';
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  }
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  $is_https = isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on';
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  if (isset($base_url)) {
    // Parse fixed base URL from settings.php.
    $parts = parse_url($base_url);
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    if (!isset($parts['path'])) {
      $parts['path'] = '';
    }
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    $base_path = $parts['path'] . '/';
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    // Build $base_root (everything until first slash after "scheme://").
    $base_root = substr($base_url, 0, strlen($base_url) - strlen($parts['path']));
  }
  else {
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    // Create base URL.
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    $http_protocol = $is_https ? 'https' : 'http';
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    $base_root = $http_protocol . '://' . $_SERVER['HTTP_HOST'];
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    $base_url = $base_root;
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    // $_SERVER['SCRIPT_NAME'] can, in contrast to $_SERVER['PHP_SELF'], not
    // be modified by a visitor.
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    if ($dir = rtrim(dirname($_SERVER['SCRIPT_NAME']), '\/')) {
      $base_path = $dir;
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      $base_url .= $base_path;
      $base_path .= '/';
    }
    else {
      $base_path = '/';
    }
  }
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  $base_secure_url = str_replace('http://', 'https://', $base_url);
  $base_insecure_url = str_replace('https://', 'http://', $base_url);
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  if ($cookie_domain) {
    // If the user specifies the cookie domain, also use it for session name.
    $session_name = $cookie_domain;
  }
  else {
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    // Otherwise use $base_url as session name, without the protocol
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    // to use the same session identifiers across HTTP and HTTPS.
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    list( , $session_name) = explode('://', $base_url, 2);
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    // HTTP_HOST can be modified by a visitor, but we already sanitized it
    // in drupal_settings_initialize().
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    if (!empty($_SERVER['HTTP_HOST'])) {
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      $cookie_domain = $_SERVER['HTTP_HOST'];
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      // Strip leading periods, www., and port numbers from cookie domain.
      $cookie_domain = ltrim($cookie_domain, '.');
      if (strpos($cookie_domain, 'www.') === 0) {
        $cookie_domain = substr($cookie_domain, 4);
      }
      $cookie_domain = explode(':', $cookie_domain);
      $cookie_domain = '.' . $cookie_domain[0];
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    }
  }
  // Per RFC 2109, cookie domains must contain at least one dot other than the
  // first. For hosts such as 'localhost' or IP Addresses we don't set a cookie domain.
  if (count(explode('.', $cookie_domain)) > 2 && !is_numeric(str_replace('.', '', $cookie_domain))) {
    ini_set('session.cookie_domain', $cookie_domain);
  }
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  // To prevent session cookies from being hijacked, a user can configure the
  // SSL version of their website to only transfer session cookies via SSL by
  // using PHP's session.cookie_secure setting. The browser will then use two
  // separate session cookies for the HTTPS and HTTP versions of the site. So we
  // must use different session identifiers for HTTPS and HTTP to prevent a
  // cookie collision.
  if ($is_https) {
    ini_set('session.cookie_secure', TRUE);
  }
  $prefix = ini_get('session.cookie_secure') ? 'SSESS' : 'SESS';
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  session_name($prefix . substr(hash('sha256', $session_name), 0, 32));
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}

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/**
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 * 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.
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 *
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 * 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
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 * configuration. For example, a module 'foo' may legally be located
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 * in any of these three places:
 *
 * modules/foo/foo.module
 * sites/all/modules/foo/foo.module
 * sites/example.com/modules/foo/foo.module
 *
 * Calling drupal_get_filename('module', 'foo') will give you one of
 * the above, depending on where the module is located.
 *
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 * @param $type
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 *   The type of the item (theme, theme_engine, module, profile).
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 * @param $name
 *   The name of the item for which the filename is requested.
 * @param $filename
 *   The filename of the item if it is to be set explicitly rather
 *   than by consulting the database.
 *
 * @return
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 *   The filename of the requested item or NULL if the item is not found.
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 */
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function drupal_get_filename($type, $name, $filename = NULL) {
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  // The location of files will not change during the request, so do not use
  // drupal_static().
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  static $files = array(), $dirs = array();
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  // Profiles are a special case: they have a fixed location and naming.
  if ($type == 'profile') {
    $profile_filename = "profiles/$name/$name.profile";
    $files[$type][$name] = file_exists($profile_filename) ? $profile_filename : FALSE;
  }
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  if (!isset($files[$type])) {
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    $files[$type] = array();
  }

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  if (!empty($filename) && file_exists($filename)) {
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    $files[$type][$name] = $filename;
  }
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  elseif (isset($files[$type][$name])) {
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    // nothing
  }
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  // Verify that we have an active database connection, before querying
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  // the database. This is required because this function is called both
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  // before we have a database connection (i.e. during installation) and
  // when a database connection fails.
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  else {
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    try {
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      if (function_exists('db_query')) {
        $file = db_query("SELECT filename FROM {system} WHERE name = :name AND type = :type", array(':name' => $name, ':type' => $type))->fetchField();
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        if ($file !== FALSE && file_exists(DRUPAL_ROOT . '/' . $file)) {
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          $files[$type][$name] = $file;
        }
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      }
    }
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    catch (Exception $e) {
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      // The database table may not exist because Drupal is not yet installed,
      // or the database might be down. We have a fallback for this case so we
      // hide the error completely.
    }
    // Fallback to searching the filesystem if the database could not find the
    // file or the file returned by the database is not found.
    if (!isset($files[$type][$name])) {
      // We have a consistent directory naming: modules, themes...
      $dir = $type . 's';
      if ($type == 'theme_engine') {
        $dir = 'themes/engines';
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        $extension = 'engine';
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      }
      elseif ($type == 'theme') {
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        $extension = 'info';
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      }
      else {
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        $extension = $type;
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      }

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      if (!isset($dirs[$dir][$extension])) {
        $dirs[$dir][$extension] = TRUE;
        if (!function_exists('drupal_system_listing')) {
          require_once DRUPAL_ROOT . '/includes/common.inc';
        }
        // Scan the appropriate directories for all files with the requested
        // extension, not just the file we are currently looking for. This
        // prevents unnecessary scans from being repeated when this function is
        // called more than once in the same page request.
        $matches = drupal_system_listing("/^" . DRUPAL_PHP_FUNCTION_PATTERN . "\.$extension$/", $dir, 'name', 0);
        foreach ($matches as $matched_name => $file) {
          $files[$type][$matched_name] = $file->uri;
        }
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      }
    }
  }

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  if (isset($files[$type][$name])) {
    return $files[$type][$name];
  }
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}

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/**
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 * Loads the persistent variable table.
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 *
 * The variable table is composed of values that have been saved in the table
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 * with variable_set() as well as those explicitly specified in the
 * configuration file.
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 */
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function variable_initialize($conf = array()) {
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  // NOTE: caching the variables improves performance by 20% when serving
  // cached pages.
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  if ($cached = cache_get('variables', 'cache_bootstrap')) {
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    $variables = $cached->data;
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  }
  else {
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    // Cache miss. Avoid a stampede.
    $name = 'variable_init';
    if (!lock_acquire($name, 1)) {
      // Another request is building the variable cache.
      // Wait, then re-run this function.
      lock_wait($name);
      return variable_initialize($conf);
    }
    else {
      // Proceed with variable rebuild.
      $variables = array_map('unserialize', db_query('SELECT name, value FROM {variable}')->fetchAllKeyed());
      cache_set('variables', $variables, 'cache_bootstrap');
      lock_release($name);
    }
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  }

  foreach ($conf as $name => $value) {
    $variables[$name] = $value;
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  }

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  return $variables;
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}

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/**
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 * Returns a persistent variable.
 *
 * Case-sensitivity of the variable_* functions depends on the database
 * collation used. To avoid problems, always use lower case for persistent
 * variable names.
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 *
 * @param $name
 *   The name of the variable to return.
 * @param $default
 *   The default value to use if this variable has never been set.
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 *
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 * @return
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 *   The value of the variable. Unserialization is taken care of as necessary.
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 *
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 * @see variable_del()
 * @see variable_set()
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 */
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function variable_get($name, $default = NULL) {
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  global $conf;

  return isset($conf[$name]) ? $conf[$name] : $default;
}

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/**
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 * Sets a persistent variable.
 *
 * Case-sensitivity of the variable_* functions depends on the database
 * collation used. To avoid problems, always use lower case for persistent
 * variable names.
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 *
 * @param $name
 *   The name of the variable to set.
 * @param $value
 *   The value to set. This can be any PHP data type; these functions take care
 *   of serialization as necessary.
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 *
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 * @see variable_del()
 * @see variable_get()
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 */
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function variable_set($name, $value) {
  global $conf;

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  db_merge('variable')->key(array('name' => $name))->fields(array('value' => serialize($value)))->execute();
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  cache_clear_all('variables', 'cache_bootstrap');
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  $conf[$name] = $value;
}

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/**
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 * Unsets a persistent variable.
 *
 * Case-sensitivity of the variable_* functions depends on the database
 * collation used. To avoid problems, always use lower case for persistent
 * variable names.
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 *
 * @param $name
 *   The name of the variable to undefine.
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 *
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 * @see variable_get()
 * @see variable_set()
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 */
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function variable_del($name) {
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  global $conf;

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  db_delete('variable')
    ->condition('name', $name)
    ->execute();
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  cache_clear_all('variables', 'cache_bootstrap');
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  unset($conf[$name]);
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}

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/**
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 * Retrieves the current page from the cache.
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 *
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 * Note: we do not serve cached pages to authenticated users, or to anonymous
 * users when $_SESSION is non-empty. $_SESSION may contain status messages
 * from a form submission, the contents of a shopping cart, or other user-
 * specific content that should not be cached and displayed to other users.
 *
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 * @param $check_only
 *   (optional) Set to TRUE to only return whether a previous call found a
 *   cache entry.
 *
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 * @return
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 *   The cache object, if the page was found in the cache, NULL otherwise.
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 */
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function drupal_page_get_cache($check_only = FALSE) {
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  global $base_root;
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  static $cache_hit = FALSE;

  if ($check_only) {
    return $cache_hit;
  }
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  if (drupal_page_is_cacheable()) {
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    $cache = cache_get($base_root . request_uri(), 'cache_page');
    if ($cache !== FALSE) {
      $cache_hit = TRUE;
    }
    return $cache;
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  }
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}

/**
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 * Determines the cacheability of the current page.
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 *
 * @param $allow_caching
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 *   Set to FALSE if you want to prevent this page to get cached.
 *
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 * @return
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 *   TRUE if the current page can be cached, FALSE otherwise.
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 */
function drupal_page_is_cacheable($allow_caching = NULL) {
  $allow_caching_static = &drupal_static(__FUNCTION__, TRUE);
  if (isset($allow_caching)) {
    $allow_caching_static = $allow_caching;
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  }
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  return $allow_caching_static && ($_SERVER['REQUEST_METHOD'] == 'GET' || $_SERVER['REQUEST_METHOD'] == 'HEAD')
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    && !drupal_is_cli();
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}

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/**
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 * Invokes a bootstrap hook in all bootstrap modules that implement it.
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 *
 * @param $hook
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 *   The name of the bootstrap hook to invoke.
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 *
 * @see bootstrap_hooks()
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 */
function bootstrap_invoke_all($hook) {
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  // Bootstrap modules should have been loaded when this function is called, so
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  // we don't need to tell module_list() to reset its internal list (and we
  // therefore leave the first parameter at its default value of FALSE). We
  // still pass in TRUE for the second parameter, though; in case this is the
  // first time during the bootstrap that module_list() is called, we want to
  // make sure that its internal cache is primed with the bootstrap modules
  // only.
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  foreach (module_list(FALSE, TRUE) as $module) {
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    drupal_load('module', $module);
    module_invoke($module, $hook);
  }
}

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/**
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 * Includes a file with the provided type and name.
 *
 * This prevents including a theme, engine, module, etc., more than once.
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 *
 * @param $type
 *   The type of item to load (i.e. theme, theme_engine, module).
 * @param $name
 *   The name of the item to load.
 *
 * @return
 *   TRUE if the item is loaded or has already been loaded.
 */
function drupal_load($type, $name) {
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  // Once a file is included this can't be reversed during a request so do not
  // use drupal_static() here.
  static $files = array();
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  if (isset($files[$type][$name])) {
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    return TRUE;
  }

  $filename = drupal_get_filename($type, $name);

  if ($filename) {
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    include_once DRUPAL_ROOT . '/' . $filename;
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    $files[$type][$name] = TRUE;

    return TRUE;
  }

  return FALSE;
}

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/**
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 * Sets an HTTP response header for the current page.
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 *
 * Note: When sending a Content-Type header, always include a 'charset' type,
 * too. This is necessary to avoid security bugs (e.g. UTF-7 XSS).
 *
 * @param $name
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 *   The HTTP header name, or the special 'Status' header name.
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 * @param $value
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 *   The HTTP header value; if equal to FALSE, the specified header is unset.
 *   If $name is 'Status', this is expected to be a status code followed by a
 *   reason phrase, e.g. "404 Not Found".