corpus_parole: comparison cms/drupal/includes/bootstrap.inc

equal deleted inserted replaced

-:07239de796bb
+:e756a8c72c3d
+<?php
+/**
+* @file
+* Functions that need to be loaded on every Drupal request.
+*/
+/**
+* The current system version.
+*/
+define('VERSION', '7.56');
+/**
+* Core API compatibility.
+*/
+define('DRUPAL_CORE_COMPATIBILITY', '7.x');
+/**
+* Minimum supported version of PHP.
+*/
+define('DRUPAL_MINIMUM_PHP', '5.2.4');
+/**
+* Minimum recommended value of PHP memory_limit.
+*/
+define('DRUPAL_MINIMUM_PHP_MEMORY_LIMIT', '32M');
+/**
+* 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);
+/**
+* Indicates that the item should never be removed unless explicitly selected.
+*
+* The item may be removed using cache_clear_all() with a cache ID.
+*/
+define('CACHE_PERMANENT', 0);
+/**
+* Indicates that the item should be removed at the next general cache wipe.
+*/
+define('CACHE_TEMPORARY', -1);
+/**
+* @defgroup logging_severity_levels Logging severity levels
+* @{
+* Logging severity levels as defined in RFC 3164.
+*
+* The WATCHDOG_* constant definitions correspond to the logging severity levels
+* defined in RFC 3164, section 4.1.1. PHP supplies predefined LOG_* constants
+* for use in the syslog() function, but their values on Windows builds do not
+* correspond to RFC 3164. The associated PHP bug report was closed with the
+* 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
+* @see watchdog()
+* @see watchdog_severity_levels()
+*/
+/**
+* Log message severity -- Emergency: system is unusable.
+*/
+define('WATCHDOG_EMERGENCY', 0);
+/**
+* Log message severity -- Alert: action must be taken immediately.
+*/
+define('WATCHDOG_ALERT', 1);
+/**
+* Log message severity -- Critical conditions.
+*/
+define('WATCHDOG_CRITICAL', 2);
+/**
+* Log message severity -- Error conditions.
+*/
+define('WATCHDOG_ERROR', 3);
+/**
+* Log message severity -- Warning conditions.
+*/
+define('WATCHDOG_WARNING', 4);
+/**
+* Log message severity -- Normal but significant conditions.
+*/
+define('WATCHDOG_NOTICE', 5);
+/**
+* Log message severity -- Informational messages.
+*/
+define('WATCHDOG_INFO', 6);
+/**
+* Log message severity -- Debug-level messages.
+*/
+define('WATCHDOG_DEBUG', 7);
+/**
+* @} End of "defgroup logging_severity_levels".
+*/
+/**
+* First bootstrap phase: initialize configuration.
+*/
+define('DRUPAL_BOOTSTRAP_CONFIGURATION', 0);
+/**
+* Second bootstrap phase: try to serve a cached page.
+*/
+define('DRUPAL_BOOTSTRAP_PAGE_CACHE', 1);
+/**
+* Third bootstrap phase: initialize database layer.
+*/
+define('DRUPAL_BOOTSTRAP_DATABASE', 2);
+/**
+* Fourth bootstrap phase: initialize the variable system.
+*/
+define('DRUPAL_BOOTSTRAP_VARIABLES', 3);
+/**
+* Fifth bootstrap phase: initialize session handling.
+*/
+define('DRUPAL_BOOTSTRAP_SESSION', 4);
+/**
+* Sixth bootstrap phase: set up the page header.
+*/
+define('DRUPAL_BOOTSTRAP_PAGE_HEADER', 5);
+/**
+* Seventh bootstrap phase: find out language of the page.
+*/
+define('DRUPAL_BOOTSTRAP_LANGUAGE', 6);
+/**
+* Final bootstrap phase: Drupal is fully loaded; validate and fix input data.
+*/
+define('DRUPAL_BOOTSTRAP_FULL', 7);
+/**
+* Role ID for anonymous users; should match what's in the "role" table.
+*/
+define('DRUPAL_ANONYMOUS_RID', 1);
+/**
+* Role ID for authenticated users; should match what's in the "role" table.
+*/
+define('DRUPAL_AUTHENTICATED_RID', 2);
+/**
+* The number of bytes in a kilobyte.
+*
+* For more information, visit http://en.wikipedia.org/wiki/Kilobyte.
+*/
+define('DRUPAL_KILOBYTE', 1024);
+/**
+* The language code used when no language is explicitly assigned.
+*
+* Defined by ISO639-2 for "Undetermined".
+*/
+define('LANGUAGE_NONE', 'und');
+/**
+* The type of language used to define the content language.
+*/
+define('LANGUAGE_TYPE_CONTENT', 'language_content');
+/**
+* The type of language used to select the user interface.
+*/
+define('LANGUAGE_TYPE_INTERFACE', 'language');
+/**
+* The type of language used for URLs.
+*/
+define('LANGUAGE_TYPE_URL', 'language_url');
+/**
+* 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);
+/**
+* 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']);
+/**
+* Flag used to indicate that text is not sanitized, so run check_plain().
+*
+* @see drupal_set_title()
+*/
+define('CHECK_PLAIN', 0);
+/**
+* Flag used to indicate that text has already been sanitized.
+*
+* @see drupal_set_title()
+*/
+define('PASS_THROUGH', -1);
+/**
+* Signals that the registry lookup cache should be reset.
+*/
+define('REGISTRY_RESET_LOOKUP_CACHE', 1);
+/**
+* Signals that the registry lookup cache should be written to storage.
+*/
+define('REGISTRY_WRITE_LOOKUP_CACHE', 2);
+/**
+* Regular expression to match PHP function names.
+*
+* @see http://php.net/manual/language.functions.php
+*/
+define('DRUPAL_PHP_FUNCTION_PATTERN', '[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*');
+/**
+* A RFC7231 Compliant date.
+*
+* http://tools.ietf.org/html/rfc7231#section-7.1.1.1
+*
+* Example: Sun, 06 Nov 1994 08:49:37 GMT
+*
+* This constant was introduced in PHP 7.0.19 and PHP 7.1.5 but needs to be
+* defined by Drupal for earlier PHP versions.
+*/
+if (!defined('DATE_RFC7231')) {
+define('DATE_RFC7231', 'D, d M Y H:i:s \G\M\T');
+}
+/**
+* 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·
+* http://php.net/manual/arrayaccess.offsetget.php on
+* 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
+* procedural code. Extending classes may wish to alter this behavior, for
+* 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().
+*/
+protected $cid;
+/**
+* A bin to pass to cache_set() and cache_get().
+*/
+protected $bin;
+/**
+* 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();
+/**
+* Constructs a DrupalCacheArray object.
+*
+* @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 = $cached->data;
+}
+}
+/**
+* Implements ArrayAccess::offsetExists().
+*/
+public function offsetExists($offset) {
+return $this->offsetGet($offset) !== NULL;
+}
+/**
+* Implements ArrayAccess::offsetGet().
+*/
+public function offsetGet($offset) {
+if (isset($this->storage[$offset]) || array_key_exists($offset, $this->storage)) {
+return $this->storage[$offset];
+}
+else {
+return $this->resolveCacheMiss($offset);
+}
+}
+/**
+* Implements ArrayAccess::offsetSet().
+*/
+public function offsetSet($offset, $value) {
+$this->storage[$offset] = $value;
+}
+/**
+* Implements ArrayAccess::offsetUnset().
+*/
+public function offsetUnset($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
+*   The array offset that was requested.
+* @param $persist
+*   Optional boolean to specify whether the offset should be persisted or
+*   not, defaults to TRUE. When called with $persist = FALSE the offset will
+*   be unflagged so that it will not be written at the end of the request.
+*/
+protected function persist($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);
+/**
+* Writes a value to the persistent cache immediately.
+*
+* @param $data
+*   The data to write to the persistent cache.
+* @param $lock
+*   Whether to acquire a lock before writing to cache.
+*/
+protected function set($data, $lock = TRUE) {
+// Lock cache writes to help avoid stampedes.
+// To implement locking for cache misses, override __construct().
+$lock_name = $this->cid . ':' . $this->bin;
+if (!$lock || lock_acquire($lock_name)) {
+if ($cached = cache_get($this->cid, $this->bin)) {
+$data = $cached->data + $data;
+}
+cache_set($this->cid, $data, $this->bin);
+if ($lock) {
+lock_release($lock_name);
+}
+}
+}
+/**
+* Destructs the DrupalCacheArray object.
+*/
+public function __destruct() {
+$data = array();
+foreach ($this->keysToPersist as $offset => $persist) {
+if ($persist) {
+$data[$offset] = $this->storage[$offset];
+}
+}
+if (!empty($data)) {
+$this->set($data);
+}
+}
+}
+/**
+* Starts the timer with the specified name.
+*
+* If you start and stop the same timer multiple times, the measured intervals
+* will be accumulated.
+*
+* @param $name
+*   The name of the timer.
+*/
+function timer_start($name) {
+global $timers;
+$timers[$name]['start'] = microtime(TRUE);
+$timers[$name]['count'] = isset($timers[$name]['count']) ? ++$timers[$name]['count'] : 1;
+}
+/**
+* Reads the current timer value without stopping the timer.
+*
+* @param $name
+*   The name of the timer.
+*
+* @return
+*   The current timer value in ms.
+*/
+function timer_read($name) {
+global $timers;
+if (isset($timers[$name]['start'])) {
+$stop = microtime(TRUE);
+$diff = round(($stop - $timers[$name]['start']) * 1000, 2);
+if (isset($timers[$name]['time'])) {
+$diff += $timers[$name]['time'];
+}
+return $diff;
+}
+return $timers[$name]['time'];
+}
+/**
+* Stops the timer with the specified name.
+*
+* @param $name
+*   The name of the timer.
+*
+* @return
+*   A timer array. The array contains the number of times the timer has been
+*   started and stopped (count) and the accumulated timer value in ms (time).
+*/
+function timer_stop($name) {
+global $timers;
+if (isset($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']);
+}
+return $timers[$name];
+}
+/**
+* Returns the appropriate configuration directory.
+*
+* Returns the configuration path based on the site's hostname, port, and
+* pathname. See default.settings.php for examples on how the URL is converted
+* to a directory.
+*
+* @param bool $require_settings
+*   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.
+* @param bool $reset
+*   Force a full search for matching directories even if one had been
+*   found previously. Defaults to FALSE.
+*
+* @return
+*   The path of the matching directory.
+*
+* @see default.settings.php
+*/
+function conf_path($require_settings = TRUE, $reset = FALSE) {
+$conf = &drupal_static(__FUNCTION__, '');
+if ($conf && !$reset) {
+return $conf;
+}
+$confdir = 'sites';
+$sites = array();
+if (file_exists(DRUPAL_ROOT . '/' . $confdir . '/sites.php')) {
+// This will overwrite $sites with the desired mappings.
+include(DRUPAL_ROOT . '/' . $confdir . '/sites.php');
+}
+$uri = explode('/', $_SERVER['SCRIPT_NAME'] ? $_SERVER['SCRIPT_NAME'] : $_SERVER['SCRIPT_FILENAME']);
+$server = explode('.', implode('.', array_reverse(explode(':', rtrim($_SERVER['HTTP_HOST'], '.')))));
+for ($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, $i));
+if (isset($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 . '/' . $dir))) {
+$conf = "$confdir/$dir";
+return $conf;
+}
+}
+}
+$conf = "$confdir/default";
+return $conf;
+}
+/**
+* Sets appropriate server variables needed for command line scripts to work.
+*
+* 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()) {
+// Allow the provided URL to override any existing values in $_SERVER.
+if (isset($variables['url'])) {
+$url = parse_url($variables['url']);
+if (isset($url['host'])) {
+$_SERVER['HTTP_HOST'] = $url['host'];
+}
+if (isset($url['path'])) {
+$_SERVER['SCRIPT_NAME'] = $url['path'];
+}
+unset($variables['url']);
+}
+// Define default values for $_SERVER keys. These will be used if $_SERVER
+// does not already define them and no other values are passed in to this
+// function.
+$defaults = array(
+'HTTP_HOST' => 'localhost',
+'SCRIPT_NAME' => NULL,
+'REMOTE_ADDR' => '127.0.0.1',
+'REQUEST_METHOD' => 'GET',
+'SERVER_NAME' => NULL,
+'SERVER_SOFTWARE' => NULL,
+'HTTP_USER_AGENT' => NULL,
+);
+// Replace elements of the $_SERVER array, as appropriate.
+$_SERVER = $variables + $_SERVER + $defaults;
+}
+/**
+* Initializes the PHP environment.
+*/
+function drupal_environment_initialize() {
+if (!isset($_SERVER['HTTP_REFERER'])) {
+$_SERVER['HTTP_REFERER'] = '';
+}
+if (!isset($_SERVER['SERVER_PROTOCOL']) || ($_SERVER['SERVER_PROTOCOL'] != 'HTTP/1.0' && $_SERVER['SERVER_PROTOCOL'] != 'HTTP/1.1')) {
+$_SERVER['SERVER_PROTOCOL'] = 'HTTP/1.0';
+}
+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'] = '';
+}
+// 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();
+// Enforce E_ALL, but allow users to set levels not part of E_ALL.
+error_reporting(E_ALL | error_reporting());
+// 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.
+// Don't escape quotes when reading files from the database, disk, etc.
+ini_set('magic_quotes_runtime', '0');
+// Use session cookies, not transparent sessions that puts the session id in
+// the query string.
+ini_set('session.use_cookies', '1');
+ini_set('session.use_only_cookies', '1');
+ini_set('session.use_trans_sid', '0');
+// Don't send HTTP headers using PHP's session handler.
+// An empty string is used here to disable the cache limiter.
+ini_set('session.cache_limiter', '');
+// Use httponly session cookies.
+ini_set('session.cookie_httponly', '1');
+// Set sane locale settings, to ensure consistent string, dates, times and
+// numbers handling.
+setlocale(LC_ALL, 'C');
+}
+/**
+* Validates that a hostname (for example $_SERVER['HTTP_HOST']) is safe.
+*
+* @return
+*  TRUE if only containing valid characters, or FALSE otherwise.
+*/
+function drupal_valid_http_host($host) {
+// 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('/^\[?(?:[a-zA-Z0-9-:\]_]+\.?)+$/', $host);
+}
+/**
+* Checks whether an HTTPS request is being served.
+*
+* @return bool
+*   TRUE if the request is HTTPS, FALSE otherwise.
+*/
+function drupal_is_https() {
+return isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) == 'on';
+}
+/**
+* Sets the base URL, cookie domain, and session name from configuration.
+*/
+function drupal_settings_initialize() {
+global $base_url, $base_path, $base_root;
+// Export these settings.php variables to the global namespace.
+global $databases, $cookie_domain, $conf, $installed_profile, $update_free_access, $db_url, $db_prefix, $drupal_hash_salt, $is_https, $base_secure_url, $base_insecure_url;
+$conf = array();
+if (file_exists(DRUPAL_ROOT . '/' . conf_path() . '/settings.php')) {
+include_once DRUPAL_ROOT . '/' . conf_path() . '/settings.php';
+}
+$is_https = drupal_is_https();
+if (isset($base_url)) {
+// Parse fixed base URL from settings.php.
+$parts = parse_url($base_url);
+if (!isset($parts['path'])) {
+$parts['path'] = '';
+}
+$base_path = $parts['path'] . '/';
+// Build $base_root (everything until first slash after "scheme://").
+$base_root = substr($base_url, 0, strlen($base_url) - strlen($parts['path']));
+}
+else {
+// Create base URL.
+$http_protocol = $is_https ? 'https' : 'http';
+$base_root = $http_protocol . '://' . $_SERVER['HTTP_HOST'];
+$base_url = $base_root;
+// $_SERVER['SCRIPT_NAME'] can, in contrast to $_SERVER['PHP_SELF'], not
+// be modified by a visitor.
+if ($dir = rtrim(dirname($_SERVER['SCRIPT_NAME']), '\/')) {
+$base_path = $dir;
+$base_url .= $base_path;
+$base_path .= '/';
+}
+else {
+$base_path = '/';
+}
+}
+$base_secure_url = str_replace('http://', 'https://', $base_url);
+$base_insecure_url = str_replace('https://', 'http://', $base_url);
+if ($cookie_domain) {
+// If the user specifies the cookie domain, also use it for session name.
+$session_name = $cookie_domain;
+}
+else {
+// Otherwise use $base_url as session name, without the protocol
+// to use the same session identifiers across HTTP and HTTPS.
+list( , $session_name) = explode('://', $base_url, 2);
+// HTTP_HOST can be modified by a visitor, but we already sanitized it
+// in drupal_settings_initialize().
+if (!empty($_SERVER['HTTP_HOST'])) {
+$cookie_domain = $_SERVER['HTTP_HOST'];
+// Strip leading periods, www., and port numbers from cookie domain.
+$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];
+}
+}
+// 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', $cookie_domain);
+}
+// To prevent session cookies from being hijacked, a user can configure the
+// SSL version of their website to only transfer session cookies via SSL by
+// using PHP's session.cookie_secure setting. The browser will then use two
+// separate session cookies for the HTTPS and HTTP versions of the site. So we
+// must use different session identifiers for HTTPS and HTTP to prevent a
+// cookie collision.
+if ($is_https) {
+ini_set('session.cookie_secure', TRUE);
+}
+$prefix = ini_get('session.cookie_secure') ? 'SSESS' : 'SESS';
+session_name($prefix . substr(hash('sha256', $session_name), 0, 32));
+}
+/**
+* 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:
+*
+* 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.
+*
+* @param $type
+*   The type of the item (theme, theme_engine, module, profile).
+* @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.
+* @param bool $trigger_error
+*   Whether to trigger an error when a file is missing or has unexpectedly
+*   moved. This defaults to TRUE, but can be set to FALSE by calling code that
+*   merely wants to check whether an item exists in the filesystem.
+*
+* @return
+*   The filename of the requested item or NULL if the item is not found.
+*/
+function drupal_get_filename($type, $name, $filename = NULL, $trigger_error = TRUE) {
+// The $files static variable will hold the locations of all requested files.
+// We can be sure that any file listed in this static variable actually
+// exists as all additions have gone through a file_exists() check.
+// The location of files will not change during the request, so do not use
+// drupal_static().
+static $files = array();
+// Profiles are a special case: they have a fixed location and naming.
+if ($type == 'profile') {
+$profile_filename = "profiles/$name/$name.profile";
+$files[$type][$name] = file_exists($profile_filename) ? $profile_filename : FALSE;
+}
+if (!isset($files[$type])) {
+$files[$type] = array();
+}
+if (!empty($filename) && file_exists($filename)) {
+// Prime the static cache with the provided filename.
+$files[$type][$name] = $filename;
+}
+elseif (isset($files[$type][$name])) {
+// This item had already been found earlier in the request, either through
+// priming of the static cache (for example, in system_list()), through a
+// lookup in the {system} table, or through a file scan (cached or not). Do
+// nothing.
+}
+else {
+// Look for the filename listed in the {system} table. Verify that we have
+// an active database connection before doing so, since this function is
+// called both before we have a database connection (i.e. during
+// installation) and when a database connection fails.
+$database_unavailable = TRUE;
+try {
+if (function_exists('db_query')) {
+$file = db_query("SELECT filename FROM {system} WHERE name = :name AND type = :type", array(':name' => $name, ':type' => $type))->fetchField();
+if ($file !== FALSE && file_exists(DRUPAL_ROOT . '/' . $file)) {
+$files[$type][$name] = $file;
+}
+$database_unavailable = FALSE;
+}
+}
+catch (Exception $e) {
+// The database table may not exist because Drupal is not yet installed,
+// the database might be down, or we may have done a non-database cache
+// flush while $conf['page_cache_without_database'] = TRUE and
+// $conf['page_cache_invoke_hooks'] = TRUE. We have a fallback for these
+// cases so we hide the error completely.
+}
+// Fall back to searching the filesystem if the database could not find the
+// file or the file does not exist at the path returned by the database.
+if (!isset($files[$type][$name])) {
+$files[$type][$name] = _drupal_get_filename_fallback($type, $name, $trigger_error, $database_unavailable);
+}
+}
+if (isset($files[$type][$name])) {
+return $files[$type][$name];
+}
+}
+/**
+* Performs a cached file system scan as a fallback when searching for a file.
+*
+* This function looks for the requested file by triggering a file scan,
+* caching the new location if the file has moved and caching the miss
+* if the file is missing. If a file had been marked as missing in a previous
+* file scan, or if it has been marked as moved and is still in the last known
+* location, no new file scan will be performed.
+*
+* @param string $type
+*   The type of the item (theme, theme_engine, module, profile).
+* @param string $name
+*   The name of the item for which the filename is requested.
+* @param bool $trigger_error
+*   Whether to trigger an error when a file is missing or has unexpectedly
+*   moved.
+* @param bool $database_unavailable
+*   Whether this function is being called because the Drupal database could
+*   not be queried for the file's location.
+*
+* @return
+*   The filename of the requested item or NULL if the item is not found.
+*
+* @see drupal_get_filename()
+*/
+function _drupal_get_filename_fallback($type, $name, $trigger_error, $database_unavailable) {
+$file_scans = &_drupal_file_scan_cache();
+$filename = NULL;
+// If the cache indicates that the item is missing, or we can verify that the
+// item exists in the location the cache says it exists in, use that.
+if (isset($file_scans[$type][$name]) && ($file_scans[$type][$name] === FALSE || file_exists($file_scans[$type][$name]))) {
+$filename = $file_scans[$type][$name];
+}
+// Otherwise, perform a new file scan to find the item.
+else {
+$filename = _drupal_get_filename_perform_file_scan($type, $name);
+// Update the static cache, and mark the persistent cache for updating at
+// the end of the page request. See drupal_file_scan_write_cache().
+$file_scans[$type][$name] = $filename;
+$file_scans['#write_cache'] = TRUE;
+}
+// If requested, trigger a user-level warning about the missing or
+// unexpectedly moved file. If the database was unavailable, do not trigger a
+// warning in the latter case, though, since if the {system} table could not
+// be queried there is no way to know if the location found here was
+// "unexpected" or not.
+if ($trigger_error) {
+$error_type = $filename === FALSE ? 'missing' : 'moved';
+if ($error_type == 'missing' || !$database_unavailable) {
+_drupal_get_filename_fallback_trigger_error($type, $name, $error_type);
+}
+}
+// The cache stores FALSE for files that aren't found (to be able to
+// distinguish them from files that have not yet been searched for), but
+// drupal_get_filename() expects NULL for these instead, so convert to NULL
+// before returning.
+if ($filename === FALSE) {
+$filename = NULL;
+}
+return $filename;
+}
+/**
+* Returns the current list of cached file system scan results.
+*
+* @return
+*   An associative array tracking the most recent file scan results for all
+*   files that have had scans performed. The keys are the type and name of the
+*   item that was searched for, and the values can be either:
+*   - Boolean FALSE if the item was not found in the file system.
+*   - A string pointing to the location where the item was found.
+*/
+function &_drupal_file_scan_cache() {
+$file_scans = &drupal_static(__FUNCTION__, array());
+// The file scan results are stored in a persistent cache (in addition to the
+// static cache) but because this function can be called before the
+// persistent cache is available, we must merge any items that were found
+// earlier in the page request into the results from the persistent cache.
+if (!isset($file_scans['#cache_merge_done'])) {
+try {
+if (function_exists('cache_get')) {
+$cache = cache_get('_drupal_file_scan_cache', 'cache_bootstrap');
+if (!empty($cache->data)) {
+// File scan results from the current request should take precedence
+// over the results from the persistent cache, since they are newer.
+$file_scans = drupal_array_merge_deep($cache->data, $file_scans);
+}
+// Set a flag to indicate that the persistent cache does not need to be
+// merged again.
+$file_scans['#cache_merge_done'] = TRUE;
+}
+}
+catch (Exception $e) {
+// Hide the error.
+}
+}
+return $file_scans;
+}
+/**
+* Performs a file system scan to search for a system resource.
+*
+* @param $type
+*   The type of the item (theme, theme_engine, module, profile).
+* @param $name
+*   The name of the item for which the filename is requested.
+*
+* @return
+*   The filename of the requested item or FALSE if the item is not found.
+*
+* @see drupal_get_filename()
+* @see _drupal_get_filename_fallback()
+*/
+function _drupal_get_filename_perform_file_scan($type, $name) {
+// The location of files will not change during the request, so do not use
+// drupal_static().
+static $dirs = array(), $files = array();
+// We have a consistent directory naming: modules, themes...
+$dir = $type . 's';
+if ($type == 'theme_engine') {
+$dir = 'themes/engines';
+$extension = 'engine';
+}
+elseif ($type == 'theme') {
+$extension = 'info';
+}
+else {
+$extension = $type;
+}
+// Check if we had already scanned this directory/extension combination.
+if (!isset($dirs[$dir][$extension])) {
+// Log that we have now scanned this directory/extension combination
+// into a static variable so as to prevent unnecessary file scans.
+$dirs[$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 => $file) {
+// Log the locations found in the file scan into a static variable.
+$files[$type][$matched_name] = $file->uri;
+}
+}
+// Return the results of the file system scan, or FALSE to indicate the file
+// was not found.
+return isset($files[$type][$name]) ? $files[$type][$name] : FALSE;
+}
+/**
+* Triggers a user-level warning for missing or unexpectedly moved files.
+*
+* @param $type
+*   The type of the item (theme, theme_engine, module, profile).
+* @param $name
+*   The name of the item for which the filename is requested.
+* @param $error_type
+*   The type of the error ('missing' or 'moved').
+*
+* @see drupal_get_filename()
+* @see _drupal_get_filename_fallback()
+*/
+function _drupal_get_filename_fallback_trigger_error($type, $name, $error_type) {
+// Hide messages due to known bugs that will appear on a lot of sites.
+// @todo Remove this in https://www.drupal.org/node/2383823
+if (empty($name)) {
+return;
+}
+// Make sure we only show any missing or moved file errors only once per
+// request.
+static $errors_triggered = array();
+if (empty($errors_triggered[$type][$name][$error_type])) {
+// Use _drupal_trigger_error_with_delayed_logging() here since these are
+// triggered during low-level operations that cannot necessarily be
+// interrupted by a watchdog() call.
+if ($error_type == 'missing') {
+_drupal_trigger_error_with_delayed_logging(format_string('The following @type is missing from the file system: %name. For information about how to fix this, see <a href="@documentation">the documentation page</a>.', array('@type' => $type, '%name' => $name, '@documentation' => 'https://www.drupal.org/node/2487215')), E_USER_WARNING);
+}
+elseif ($error_type == 'moved') {
+_drupal_trigger_error_with_delayed_logging(format_string('The following @type has moved within the file system: %name. In order to fix this, clear caches or put the @type back in its original location. For more information, see <a href="@documentation">the documentation page</a>.', array('@type' => $type, '%name' => $name, '@documentation' => 'https://www.drupal.org/node/2487215')), E_USER_WARNING);
+}
+$errors_triggered[$type][$name][$error_type] = TRUE;
+}
+}
+/**
+* Invokes trigger_error() with logging delayed until the end of the request.
+*
+* This is an alternative to PHP's trigger_error() function which can be used
+* during low-level Drupal core operations that need to avoid being interrupted
+* by a watchdog() call.
+*
+* Normally, Drupal's error handler calls watchdog() in response to a
+* trigger_error() call. However, this invokes hook_watchdog() which can run
+* arbitrary code. If the trigger_error() happens in the middle of an
+* operation such as a rebuild operation which should not be interrupted by
+* arbitrary code, that could potentially break or trigger the rebuild again.
+* This function protects against that by delaying the watchdog() call until
+* the end of the current page request.
+*
+* This is an internal function which should only be called by low-level Drupal
+* core functions. It may be removed in a future Drupal 7 release.
+*
+* @param string $error_msg
+*   The error message to trigger. As with trigger_error() itself, this is
+*   limited to 1024 bytes; additional characters beyond that will be removed.
+* @param int $error_type
+*   (optional) The type of error. This should be one of the E_USER family of
+*   constants. As with trigger_error() itself, this defaults to E_USER_NOTICE
+*   if not provided.
+*
+* @see _drupal_log_error()
+*/
+function _drupal_trigger_error_with_delayed_logging($error_msg, $error_type = E_USER_NOTICE) {
+$delay_logging = &drupal_static(__FUNCTION__, FALSE);
+$delay_logging = TRUE;
+trigger_error($error_msg, $error_type);
+$delay_logging = FALSE;
+}
+/**
+* Writes the file scan cache to the persistent cache.
+*
+* This cache stores all files marked as missing or moved after a file scan
+* to prevent unnecessary file scans in subsequent requests. This cache is
+* cleared in system_list_reset() (i.e. after a module/theme rebuild).
+*/
+function drupal_file_scan_write_cache() {
+// Only write to the persistent cache if requested, and if we know that any
+// data previously in the cache was successfully loaded and merged in by
+// _drupal_file_scan_cache().
+$file_scans = &_drupal_file_scan_cache();
+if (isset($file_scans['#write_cache']) && isset($file_scans['#cache_merge_done'])) {
+unset($file_scans['#write_cache']);
+cache_set('_drupal_file_scan_cache', $file_scans, 'cache_bootstrap');
+}
+}
+/**
+* Loads the persistent variable table.
+*
+* The variable table is composed of values that have been saved in the table
+* with variable_set() as well as those explicitly specified in the
+* configuration file.
+*/
+function variable_initialize($conf = array()) {
+// NOTE: caching the variables improves performance by 20% when serving
+// cached pages.
+if ($cached = cache_get('variables', 'cache_bootstrap')) {
+$variables = $cached->data;
+}
+else {
+// Cache miss. Avoid a stampede.
+$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);
+}
+}
+foreach ($conf as $name => $value) {
+$variables[$name] = $value;
+}
+return $variables;
+}
+/**
+* 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.
+*
+* @param $name
+*   The name of the variable to return.
+* @param $default
+*   The default value to use if this variable has never been set.
+*
+* @return
+*   The value of the variable. Unserialization is taken care of as necessary.
+*
+* @see variable_del()
+* @see variable_set()
+*/
+function variable_get($name, $default = NULL) {
+global $conf;
+return isset($conf[$name]) ? $conf[$name] : $default;
+}
+/**
+* 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.
+*
+* @param $name
+*   The name of the variable to set.
+* @param $value
+*   The value to set. This can be any PHP data type; these functions take care
+*   of serialization as necessary.
+*
+* @see variable_del()
+* @see variable_get()
+*/
+function variable_set($name, $value) {
+global $conf;
+db_merge('variable')->key(array('name' => $name))->fields(array('value' => serialize($value)))->execute();
+cache_clear_all('variables', 'cache_bootstrap');
+$conf[$name] = $value;
+}
+/**
+* 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.
+*
+* @param $name
+*   The name of the variable to undefine.
+*
+* @see variable_get()
+* @see variable_set()
+*/
+function variable_del($name) {
+global $conf;
+db_delete('variable')
+->condition('name', $name)
+->execute();
+cache_clear_all('variables', 'cache_bootstrap');
+unset($conf[$name]);
+}
+/**
+* Retrieves the current page from the cache.
+*
+* 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.
+*
+* @param $check_only
+*   (optional) Set to TRUE to only return whether a previous call found a
+*   cache entry.
+*
+* @return
+*   The cache object, if the page was found in the cache, NULL otherwise.
+*/
+function drupal_page_get_cache($check_only = FALSE) {
+global $base_root;
+static $cache_hit = FALSE;
+if ($check_only) {
+return $cache_hit;
+}
+if (drupal_page_is_cacheable()) {
+$cache = cache_get($base_root . request_uri(), 'cache_page');
+if ($cache !== FALSE) {
+$cache_hit = TRUE;
+}
+return $cache;
+}
+}
+/**
+* Determines the cacheability of the current page.
+*
+* @param $allow_caching
+*   Set to FALSE if you want to prevent this page from being cached.
+*
+* @return
+*   TRUE if the current page can be cached, FALSE otherwise.
+*/
+function drupal_page_is_cacheable($allow_caching = NULL) {
+$allow_caching_static = &drupal_static(__FUNCTION__, TRUE);
+if (isset($allow_caching)) {
+$allow_caching_static = $allow_caching;
+}
+return $allow_caching_static && ($_SERVER['REQUEST_METHOD'] == 'GET' || $_SERVER['REQUEST_METHOD'] == 'HEAD')
+&& !drupal_is_cli();
+}
+/**
+* Invokes a bootstrap hook in all bootstrap modules that implement it.
+*
+* @param $hook
+*   The name of the bootstrap hook to invoke.
+*
+* @see bootstrap_hooks()
+*/
+function bootstrap_invoke_all($hook) {
+// Bootstrap modules should have been loaded when this function is called, so
+// 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.
+foreach (module_list(FALSE, TRUE) as $module) {
+drupal_load('module', $module);
+module_invoke($module, $hook);
+}
+}
+/**
+* Includes a file with the provided type and name.
+*
+* This prevents including a theme, engine, module, etc., more than once.
+*
+* @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) {
+// Once a file is included this can't be reversed during a request so do not
+// use drupal_static() here.
+static $files = array();
+if (isset($files[$type][$name])) {
+return TRUE;
+}
+$filename = drupal_get_filename($type, $name);
+if ($filename) {
+include_once DRUPAL_ROOT . '/' . $filename;
+$files[$type][$name] = TRUE;
+return TRUE;
+}
+return FALSE;
+}
+/**
+* Sets an HTTP response header for the current page.
+*
+* 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
+*   The HTTP header name, or the special 'Status' header name.
+* @param $value
+*   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".
+* @param $append
+*   Whether to append the value to an existing header or to replace it.
+*/
+function drupal_add_http_header($name, $value, $append = FALSE) {
+// The headers as name/value pairs.
+$headers = &drupal_static('drupal_http_headers', array());
+$name_lower = strtolower($name);
+_drupal_set_preferred_header_name($name);
+if ($value === FALSE) {
+$headers[$name_lower] = FALSE;
+}
+elseif (isset($headers[$name_lower]) && $append) {
+// Multiple headers with identical names may be combined using comma (RFC
+// 2616, section 4.2).
+$headers[$name_lower] .= ',' . $value;
+}
+else {
+$headers[$name_lower] = $value;
+}
+drupal_send_headers(array($name => $headers[$name_lower]), TRUE);
+}
+/**
+* Gets the HTTP response headers for the current page.
+*
+* @param $name
+*   An HTTP header name. If omitted, all headers are returned as name/value
+*   pairs. If an array value is FALSE, the header has been unset.
+*
+* @return
+*   A string containing the header value, or FALSE if the header has been set,
+*   or NULL if the header has not been set.
+*/
+function drupal_get_http_header($name = NULL) {
+$headers = &drupal_static('drupal_http_headers', array());
+if (isset($name)) {
+$name = strtolower($name);
+return isset($headers[$name]) ? $headers[$name] : NULL;
+}
+else {
+return $headers;
+}
+}
+/**
+* Sets the preferred name for the HTTP header.
+*
+* Header names are case-insensitive, but for maximum compatibility they should
+* follow "common form" (see RFC 2617, section 4.2).
+*/
+function _drupal_set_preferred_header_name($name = NULL) {
+static $header_names = array();
+if (!isset($name)) {
+return $header_names;
+}
+$header_names[strtolower($name)] = $name;
+}
+/**
+* Sends the HTTP response headers that were previously set, adding defaults.
+*
+* Headers are set in drupal_add_http_header(). Default headers are not set
+* if they have been replaced or unset using drupal_add_http_header().
+*
+* @param array $default_headers
+*   (optional) An array of headers as name/value pairs.
+* @param bool $only_default
+*   (optional) If TRUE and headers have already been sent, send only the
+*   specified headers.
+*/
+function drupal_send_headers($default_headers = array(), $only_default = FALSE) {
+$headers_sent = &drupal_static(__FUNCTION__, FALSE);
+$headers = drupal_get_http_header();
+if ($only_default && $headers_sent) {
+$headers = array();
+}
+$headers_sent = TRUE;
+$header_names = _drupal_set_preferred_header_name();
+foreach ($default_headers as $name => $value) {
+$name_lower = strtolower($name);
+if (!isset($headers[$name_lower])) {
+$headers[$name_lower] = $value;
+$header_names[$name_lower] = $name;
+}
+}
+foreach ($headers as $name_lower => $value) {
+if ($name_lower == 'status') {
+header($_SERVER['SERVER_PROTOCOL'] . ' ' . $value);
+}
+// Skip headers that have been unset.
+elseif ($value !== FALSE) {
+header($header_names[$name_lower] . ': ' . $value);
+}
+}
+}
+/**
+* Sets HTTP headers in preparation for a page response.
+*
+* Authenticated users are always given a 'no-cache' header, and will fetch a
+* fresh page on every request. This prevents authenticated users from seeing
+* locally cached pages.
+*
+* ETag and Last-Modified headers are not set per default for authenticated
+* users so that browsers do not send If-Modified-Since headers from
+* authenticated user pages. drupal_serve_page_from_cache() will set appropriate
+* ETag and Last-Modified headers for cached pages.
+*
+* @see drupal_page_set_cache()
+*/
+function drupal_page_header() {
+$headers_sent = &drupal_static(__FUNCTION__, FALSE);
+if ($headers_sent) {
+return TRUE;
+}
+$headers_sent = TRUE;
+$default_headers = array(
+'Expires' => 'Sun, 19 Nov 1978 05:00:00 GMT',
+'Cache-Control' => 'no-cache, must-revalidate',
+// Prevent browsers from sniffing a response and picking a MIME type
+// different from the declared content-type, since that can lead to
+// XSS and other vulnerabilities.
+'X-Content-Type-Options' => 'nosniff',
+);
+drupal_send_headers($default_headers);
+}
+/**
+* Sets HTTP headers in preparation for a cached page response.
+*
+* The headers allow as much as possible in proxies and browsers without any
+* particular knowledge about the pages. Modules can override these headers
+* using drupal_add_http_header().
+*
+* If the request is conditional (using If-Modified-Since and If-None-Match),
+* and the conditions match those currently in the cache, a 304 Not Modified
+* response is sent.
+*/
+function drupal_serve_page_from_cache(stdClass $cache) {
+// Negotiate whether to use compression.
+$page_compression = !empty($cache->data['page_compressed']);
+$return_compressed = $page_compression && isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE;
+// Get headers set in hook_boot(). Keys are lower-case.
+$hook_boot_headers = drupal_get_http_header();
+// Headers generated in this function, that may be replaced or unset using
+// drupal_add_http_headers(). Keys are mixed-case.
+$default_headers = array();
+foreach ($cache->data['headers'] as $name => $value) {
+// In the case of a 304 response, certain headers must be sent, and the
+// remaining may not (see RFC 2616, section 10.3.5). Do not override
+// headers set in hook_boot().
+$name_lower = strtolower($name);
+if (in_array($name_lower, array('content-location', 'expires', 'cache-control', 'vary')) && !isset($hook_boot_headers[$name_lower])) {
+drupal_add_http_header($name, $value);
+unset($cache->data['headers'][$name]);
+}
+}
+// If the client sent a session cookie, a cached copy will only be served
+// to that one particular client due to Vary: Cookie. Thus, do not set
+// max-age > 0, allowing the page to be cached by external proxies, when a
+// session cookie is present unless the Vary header has been replaced or
+// unset in hook_boot().
+$max_age = !isset($_COOKIE[session_name()]) || isset($hook_boot_headers['vary']) ? variable_get('page_cache_maximum_age', 0) : 0;
+$default_headers['Cache-Control'] = 'public, max-age=' . $max_age;
+// Entity tag should change if the output changes.
+$etag = '"' . $cache->created . '-' . intval($return_compressed) . '"';
+header('Etag: ' . $etag);
+// See if the client has provided the required HTTP headers.
+$if_modified_since = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) : FALSE;
+$if_none_match = isset($_SERVER['HTTP_IF_NONE_MATCH']) ? stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) : FALSE;
+if ($if_modified_since && $if_none_match
+&& $if_none_match == $etag // etag must match
+&& $if_modified_since == $cache->created) {  // if-modified-since must match
+header($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified');
+drupal_send_headers($default_headers);
+return;
+}
+// Send the remaining headers.
+foreach ($cache->data['headers'] as $name => $value) {
+drupal_add_http_header($name, $value);
+}
+$default_headers['Last-Modified'] = gmdate(DATE_RFC7231, $cache->created);
+// HTTP/1.0 proxies does not support the Vary header, so prevent any caching
+// by sending an Expires date in the past. HTTP/1.1 clients ignores the
+// Expires header if a Cache-Control: max-age= directive is specified (see RFC
+// 2616, section 14.9.3).
+$default_headers['Expires'] = 'Sun, 19 Nov 1978 05:00:00 GMT';
+drupal_send_headers($default_headers);
+// Allow HTTP proxies to cache pages for anonymous users without a session
+// cookie. The Vary header is used to indicates the set of request-header
+// fields that fully determines whether a cache is permitted to use the
+// response to reply to a subsequent request for a given URL without
+// revalidation. If a Vary header has been set in hook_boot(), it is assumed
+// that the module knows how to cache the page.
+if (!isset($hook_boot_headers['vary']) && !variable_get('omit_vary_cookie')) {
+header('Vary: Cookie');
+}
+if ($page_compression) {
+header('Vary: Accept-Encoding', FALSE);
+// If page_compression is enabled, the cache contains gzipped data.
+if ($return_compressed) {
+// $cache->data['body'] is already gzip'ed, so make sure
+// zlib.output_compression does not compress it once more.
+ini_set('zlib.output_compression', '0');
+header('Content-Encoding: gzip');
+}
+else {
+// The client does not support compression, so unzip the data in the
+// cache. Strip the gzip header and run uncompress.
+$cache->data['body'] = gzinflate(substr(substr($cache->data['body'], 10), 0, -8));
+}
+}
+// Print the page.
+print $cache->data['body'];
+}
+/**
+* Defines the critical hooks that force modules to always be loaded.
+*/
+function bootstrap_hooks() {
+return array('boot', 'exit', 'watchdog', 'language_init');
+}
+/**
+* Unserializes and appends elements from a serialized string.
+*
+* @param $obj
+*   The object to which the elements are appended.
+* @param $field
+*   The attribute of $obj whose value should be unserialized.
+*/
+function drupal_unpack($obj, $field = 'data') {
+if ($obj->$field && $data = unserialize($obj->$field)) {
+foreach ($data as $key => $value) {
+if (!empty($key) && !isset($obj->$key)) {
+$obj->$key = $value;
+}
+}
+}
+return $obj;
+}
+/**
+* Translates a string to the current language or to a given language.
+*
+* The t() function serves two purposes. First, at run-time it translates
+* user-visible text into the appropriate language. Second, various mechanisms
+* that figure out what text needs to be translated work off t() -- the text
+* inside t() calls is added to the database of strings to be translated.
+* These strings are expected to be in English, so the first argument should
+* always be in English. To enable a fully-translatable site, it is important
+* that all human-readable text that will be displayed on the site or sent to
+* a user is passed through the t() function, or a related function. See the
+* @link http://drupal.org/node/322729 Localization API @endlink pages for
+* more information, including recommendations on how to break up or not
+* break up strings for translation.
+*
+* @section sec_translating_vars Translating Variables
+* You should never use t() to translate variables, such as calling
+* @code t($text); @endcode, unless the text that the variable holds has been
+* passed through t() elsewhere (e.g., $text is one of several translated
+* literal strings in an array). It is especially important never to call
+* @code t($user_text); @endcode, 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
+* $text = t("@name's blog", array('@name' => format_username($account)));
+* @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
+* format_string() 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").
+*
+* @section sec_alt_funcs_install Use During Installation Phase
+* During the Drupal installation phase, some resources used by t() wil not be
+* available to code that needs localization. See st() and get_t() for
+* alternatives.
+*
+* @section sec_context String context
+* Matching source strings are normally only translated once, and the same
+* translation is used everywhere that has a matching string. However, in some
+* cases, a certain English source string needs to have multiple translations.
+* One example of this is the string "May", which could be used as either a
+* full month name or a 3-letter abbreviated month. In other languages where
+* the month name for May has more than 3 letters, you would need to provide
+* two different translations (one for the full name and one abbreviated), and
+* the correct form would need to be chosen, depending on how "May" is being
+* used. To facilitate this, the "May" string should be provided with two
+* different contexts in the $options parameter when calling t(). For example:
+* @code
+* t('May', array(), array('context' => 'Long month name')
+* t('May', array(), array('context' => 'Abbreviated month name')
+* @endcode
+* See https://localize.drupal.org/node/2109 for more information.
+*
+* @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 format_string() for details.
+* @param $options
+*   An associative array of additional options, with the following elements:
+*   - 'langcode' (defaults to the current language): The language code to
+*     translate to a language other than what is used to display the page.
+*   - 'context' (defaults to the empty context): A string giving the context
+*     that the source string belongs to. See @ref sec_context above for more
+*     information.
+*
+* @return
+*   The translated string.
+*
+* @see st()
+* @see get_t()
+* @see format_string()
+* @ingroup sanitization
+*/
+function t($string, array $args = array(), array $options = array()) {
+global $language;
+static $custom_strings;
+// Merge in default.
+if (empty($options['langcode'])) {
+$options['langcode'] = isset($language->language) ? $language->language : 'en';
+}
+if (empty($options['context'])) {
+$options['context'] = '';
+}
+// First, check for an array of customized strings. If present, use the array
+// *instead of* database lookups. This is a high performance way to provide a
+// handful of string replacements. See settings.php for examples.
+// Cache the $custom_strings variable to improve performance.
+if (!isset($custom_strings[$options['langcode']])) {
+$custom_strings[$options['langcode']] = variable_get('locale_custom_strings_' . $options['langcode'], array());
+}
+// Custom strings work for English too, even if locale module is disabled.
+if (isset($custom_strings[$options['langcode']][$options['context']][$string])) {
+$string = $custom_strings[$options['langcode']][$options['context']][$string];
+}
+// Translate with locale module if enabled.
+elseif ($options['langcode'] != 'en' && function_exists('locale')) {
+$string = locale($string, $options['context'], $options['langcode']);
+}
+if (empty($args)) {
+return $string;
+}
+else {
+return format_string($string, $args);
+}
+}
+/**
+* Formats a string for HTML display by replacing variable placeholders.
+*
+* This function replaces variable placeholders in a string with the requested
+* values and escapes the values so they can be safely displayed as HTML. It
+* should be used on any unknown text that is intended to be printed to an HTML
+* page (especially text that may have come from untrusted users, since in that
+* case it prevents cross-site scripting and other security problems).
+*
+* In most cases, you should use t() rather than calling this function
+* directly, since it will translate the text (on non-English-only sites) in
+* addition to formatting it.
+*
+* @param $string
+*   A string containing placeholders.
+* @param $args
+*   An associative array of replacements to make. Occurrences in $string of
+*   any key in $args are replaced with the corresponding value, after optional
+*   sanitization and formatting. The type of sanitization and formatting
+*   depends on the first character of the key:
+*   - @variable: Escaped to HTML using check_plain(). Use this as the default
+*     choice for anything displayed on a page on the site.
+*   - %variable: Escaped to HTML and formatted using drupal_placeholder(),
+*     which makes it display as <em>emphasized</em> text.
+*   - !variable: Inserted as is, with no sanitization or formatting. Only use
+*     this for text that has already been prepared for HTML display (for
+*     example, user-supplied text that has already been run through
+*     check_plain() previously, or is expected to contain some limited HTML
+*     tags and has already been run through filter_xss() previously).
+*
+* @see t()
+* @ingroup sanitization
+*/
+function format_string($string, array $args = array()) {
+// Transform arguments before inserting them.
+foreach ($args as $key => $value) {
+switch ($key[0]) {
+case '@':
+// Escaped only.
+$args[$key] = check_plain($value);
+break;
+case '%':
+default:
+// Escaped and placeholder.
+$args[$key] = drupal_placeholder($value);
+break;
+case '!':
+// Pass-through.
+}
+}
+return strtr($string, $args);
+}
+/**
+* Encodes special characters in a plain-text string for display as HTML.
+*
+* Also validates strings as UTF-8 to prevent cross site scripting attacks on
+* Internet Explorer 6.
+*
+* @param string $text
+*   The text to be checked or processed.
+*
+* @return string
+*   An HTML safe version of $text. If $text is not valid UTF-8, an empty string
+*   is returned and, on PHP < 5.4, a warning may be issued depending on server
+*   configuration (see @link https://bugs.php.net/bug.php?id=47494 @endlink).
+*
+* @see drupal_validate_utf8()
+* @ingroup sanitization
+*/
+function check_plain($text) {
+return htmlspecialchars($text, ENT_QUOTES, 'UTF-8');
+}
+/**
+* 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 $text
+*   The text to check.
+*
+* @return
+*   TRUE if the text is valid UTF-8, FALSE if not.
+*/
+function drupal_validate_utf8($text) {
+if (strlen($text) == 0) {
+return TRUE;
+}
+// With the PCRE_UTF8 modifier 'u', preg_match() fails silently on strings
+// containing invalid UTF-8 byte sequences. It does not reject character
+// codes above U+10FFFF (represented by 4 or more octets), though.
+return (preg_match('/^./us', $text) == 1);
+}
+/**
+* Returns the equivalent of Apache's $_SERVER['REQUEST_URI'] variable.
+*
+* Because $_SERVER['REQUEST_URI'] is only available on Apache, we generate an
+* equivalent using other environment variables.
+*/
+function request_uri() {
+if (isset($_SERVER['REQUEST_URI'])) {
+$uri = $_SERVER['REQUEST_URI'];
+}
+else {
+if (isset($_SERVER['argv'])) {
+$uri = $_SERVER['SCRIPT_NAME'] . '?' . $_SERVER['argv'][0];
+}
+elseif (isset($_SERVER['QUERY_STRING'])) {
+$uri = $_SERVER['SCRIPT_NAME'] . '?' . $_SERVER['QUERY_STRING'];
+}
+else {
+$uri = $_SERVER['SCRIPT_NAME'];
+}
+}
+// Prevent multiple slashes to avoid cross site requests via the Form API.
+$uri = '/' . ltrim($uri, '/');
+return $uri;
+}
+/**
+* Logs an exception.
+*
+* This is a wrapper function for watchdog() 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. Defaults to the
+*   return value of _drupal_decode_exception().
+* @param $severity
+*   The severity of the message, as per RFC 3164.
+* @param $link
+*   A link to associate with the message.
+*
+* @see watchdog()
+* @see _drupal_decode_exception()
+*/
+function watchdog_exception($type, Exception $exception, $message = NULL, $variables = array(), $severity = WATCHDOG_ERROR, $link = NULL) {
+// Use a default value if $message is not set.
+if (empty($message)) {
+// The exception message is run through check_plain() by _drupal_decode_exception().
+$message = '%type: !message in %function (line %line of %file).';
+}
+// $variables must be an array so that we can add the exception information.
+if (!is_array($variables)) {
+$variables = array();
+}
+require_once DRUPAL_ROOT . '/includes/errors.inc';
+$variables += _drupal_decode_exception($exception);
+watchdog($type, $message, $variables, $severity, $link);
+}
+/**
+* Logs a system message.
+*
+* @param $type
+*   The category to which this message belongs. Can be any string, but the
+*   general practice is to use the name of the module calling watchdog().
+* @param $message
+*   The message to store in the log. Keep $message translatable
+*   by not concatenating dynamic values into it! Variables in the
+*   message should be added by using placeholder strings alongside
+*   the variables argument to declare the value of the placeholders.
+*   See t() for documentation on how $message and $variables interact.
+* @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; one of the following values as defined in
+*   @link http://www.faqs.org/rfcs/rfc3164.html RFC 3164: @endlink
+*   - WATCHDOG_EMERGENCY: Emergency, system is unusable.
+*   - WATCHDOG_ALERT: Alert, action must be taken immediately.
+*   - WATCHDOG_CRITICAL: Critical conditions.
+*   - WATCHDOG_ERROR: Error conditions.
+*   - WATCHDOG_WARNING: Warning conditions.
+*   - WATCHDOG_NOTICE: (default) Normal but significant conditions.
+*   - WATCHDOG_INFO: Informational messages.
+*   - WATCHDOG_DEBUG: Debug-level messages.
+* @param $link
+*   A link to associate with the message.
+*
+* @see watchdog_severity_levels()
+* @see hook_watchdog()
+*/
+function watchdog($type, $message, $variables = array(), $severity = WATCHDOG_NOTICE, $link = NULL) {
+global $user, $base_root;
+static $in_error_state = FALSE;
+// It is possible that the error handling will itself trigger an error. In that case, we could
+// end up in an infinite loop. To avoid that, we implement a simple static semaphore.
+if (!$in_error_state && function_exists('module_implements')) {
+$in_error_state = TRUE;
+// The user object may not exist in all conditions, so 0 is substituted if needed.
+$user_uid = isset($user->uid) ? $user->uid : 0;
+// Prepare the fields to be logged
+$log_entry = array(
+'type'        => $type,
+'message'     => $message,
+'variables'   => $variables,
+'severity'    => $severity,
+'link'        => $link,
+'user'        => $user,
+'uid'         => $user_uid,
+'request_uri' => $base_root . request_uri(),
+'referer'     => isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '',
+'ip'          => ip_address(),
+// Request time isn't accurate for long processes, use time() instead.
+'timestamp'   => time(),
+);
+// Call the logging hooks to log/process the message
+foreach (module_implements('watchdog') as $module) {
+module_invoke($module, 'watchdog', $log_entry);
+}
+// It is critical that the semaphore is only cleared here, in the parent
+// watchdog() call (not outside the loop), to prevent recursive execution.
+$in_error_state = FALSE;
+}
+}
+/**
+* Sets a message to display to the user.
+*
+* Messages are stored in a session variable and displayed in page.tpl.php via
+* the $messages theme variable.
+*
+* Example usage:
+* @code
+* drupal_set_message(t('An error occurred and processing did not complete.'), 'error');
+* @endcode
+*
+* @param string $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 $repeat
+*   (optional) If this is FALSE and the message is already set, then the
+*   message won't be repeated. Defaults to TRUE.
+*
+* @return array|null
+*   A multidimensional array with keys corresponding to the set message types.
+*   The indexed array values of each contain the set messages for that type.
+*   Or, if there are no messages set, the function returns NULL.
+*
+* @see drupal_get_messages()
+* @see theme_status_messages()
+*/
+function drupal_set_message($message = NULL, $type = 'status', $repeat = TRUE) {
+if ($message || $message === '0' || $message === 0) {
+if (!isset($_SESSION['messages'][$type])) {
+$_SESSION['messages'][$type] = array();
+}
+if ($repeat || !in_array($message, $_SESSION['messages'][$type])) {
+$_SESSION['messages'][$type][] = $message;
+}
+// Mark this page as being uncacheable.
+drupal_page_is_cacheable(FALSE);
+}
+// Messages not set when DB connection fails.
+return isset($_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
+*   A multidimensional array with keys corresponding to the set message types.
+*   The indexed array values of each contain the set messages for that type.
+*   The messages returned are limited to the type specified in the $type
+*   parameter. If there are no messages of the specified type, an empty array
+*   is returned.
+*
+* @see drupal_set_message()
+* @see theme_status_messages()
+*/
+function drupal_get_messages($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 $messages;
+}
+}
+return array();
+}
+/**
+* Gets the title of the current page.
+*
+* The title is displayed on the page and in the title bar.
+*
+* @return
+*   The current page's title.
+*/
+function drupal_get_title() {
+$title = drupal_set_title();
+// During a bootstrap, menu.inc is not included and thus we cannot provide a title.
+if (!isset($title) && function_exists('menu_get_active_title')) {
+$title = check_plain(menu_get_active_title());
+}
+return $title;
+}
+/**
+* Sets the title of the current page.
+*
+* The title is displayed on the page and in the title bar.
+*
+* @param $title
+*   Optional string value to assign to the page title; or if set to NULL
+*   (default), leaves the current title unchanged.
+* @param $output
+*   Optional flag - normally should be left as CHECK_PLAIN. Only set to
+*   PASS_THROUGH if you have already removed any possibly dangerous code
+*   from $title using a function like check_plain() or filter_xss(). With this
+*   flag the string will be passed through unchanged.
+*
+* @return
+*   The updated title of the current page.
+*/
+function drupal_set_title($title = NULL, $output = CHECK_PLAIN) {
+$stored_title = &drupal_static(__FUNCTION__);
+if (isset($title)) {
+$stored_title = ($output == PASS_THROUGH) ? $title : check_plain($title);
+}
+return $stored_title;
+}
+/**
+* Checks to see if an IP address has been blocked.
+*
+* Blocked IP addresses are stored in the database by default. However for
+* performance reasons we allow an override in settings.php. This allows us
+* to avoid querying the database at this critical stage of the bootstrap if
+* an administrative interface for IP address blocking is not required.
+*
+* @param $ip
+*   IP address to check.
+*
+* @return bool
+*   TRUE if access is denied, FALSE if access is allowed.
+*/
+function drupal_is_denied($ip) {
+// Because this function is called on every page request, we first check
+// for an array of IP addresses in settings.php before querying the
+// database.
+$blocked_ips = variable_get('blocked_ips');
+$denied = FALSE;
+if (isset($blocked_ips) && is_array($blocked_ips)) {
+$denied = in_array($ip, $blocked_ips);
+}
+// Only check if database.inc is loaded already. If
+// $conf['page_cache_without_database'] = TRUE; is set in settings.php,
+// then the database won't be loaded here so the IPs in the database
+// won't be denied. However the user asked explicitly not to use the
+// database and also in this case it's quite likely that the user relies
+// on higher performance solutions like a firewall.
+elseif (class_exists('Database', FALSE)) {
+$denied = (bool)db_query("SELECT 1 FROM {blocked_ips} WHERE ip = :ip", array(':ip' => $ip))->fetchField();
+}
+return $denied;
+}
+/**
+* Handles denied users.
+*
+* @param $ip
+*   IP address to check. Prints a message and exits if access is denied.
+*/
+function drupal_block_denied($ip) {
+// Deny access to blocked IP addresses - t() is not yet available.
+if (drupal_is_denied($ip)) {
+header($_SERVER['SERVER_PROTOCOL'] . ' 403 Forbidden');
+print 'Sorry, ' . check_plain(ip_address()) . ' has been banned.';
+exit();
+}
+}
+/**
+* Returns a URL-safe, base64 encoded string of highly randomized bytes (over the full 8-bit range).
+*
+* @param $byte_count
+*   The number of random bytes to fetch and base64 encode.
+*
+* @return string
+*   The base64 encoded result will have a length of up to 4 * $byte_count.
+*/
+function drupal_random_key($byte_count = 32) {
+return drupal_base64_encode(drupal_random_bytes($byte_count));
+}
+/**
+* Returns a URL-safe, base64 encoded version of the supplied string.
+*
+* @param $string
+*   The string to convert to base64.
+*
+* @return string
+*/
+function drupal_base64_encode($string) {
+$data = base64_encode($string);
+// Modify the output so it's safe to use in URLs.
+return strtr($data, array('+' => '-', '/' => '_', '=' => ''));
+}
+/**
+* Returns a string of highly randomized bytes (over the full 8-bit range).
+*
+* This function is better than simply calling mt_rand() or any other built-in
+* PHP function because it can return a long string of bytes (compared to < 4
+* bytes normally from mt_rand()) and uses the best available pseudo-random
+* source.
+*
+* @param $count
+*   The number of characters (bytes) to return in the string.
+*/
+function drupal_random_bytes($count)  {
+// $random_state does not use drupal_static as it stores random bytes.
+static $random_state, $bytes, $has_openssl;
+$missing_bytes = $count - strlen($bytes);
+if ($missing_bytes > 0) {
+// PHP versions prior 5.3.4 experienced openssl_random_pseudo_bytes()
+// locking on Windows and rendered it unusable.
+if (!isset($has_openssl)) {
+$has_openssl = version_compare(PHP_VERSION, '5.3.4', '>=') && function_exists('openssl_random_pseudo_bytes');
+}
+// openssl_random_pseudo_bytes() will find entropy in a system-dependent
+// way.
+if ($has_openssl) {
+$bytes .= openssl_random_pseudo_bytes($missing_bytes);
+}
+// Else, read directly from /dev/urandom, which is available on many *nix
+// systems and is considered cryptographically secure.
+elseif ($fh = @fopen('/dev/urandom', 'rb')) {
+// PHP only performs buffered reads, so in reality it will always read
+// at least 4096 bytes. Thus, it costs nothing extra to read and store
+// that much so as to speed any additional invocations.
+$bytes .= fread($fh, max(4096, $missing_bytes));
+fclose($fh);
+}
+// If we couldn't get enough entropy, this simple hash-based PRNG will
+// generate a good set of pseudo-random bytes on any system.
+// Note that it may be important that our $random_state is passed
+// through hash() prior to being rolled into $output, that the two hash()
+// invocations are different, and that the extra input into the first one -
+// the microtime() - is prepended rather than appended. This is to avoid
+// directly leaking $random_state via the $output stream, which could
+// allow for trivial prediction of further "random" numbers.
+if (strlen($bytes) < $count) {
+// Initialize on the first call. The contents of $_SERVER includes a mix of
+// user-specific and system information that varies a little with each page.
+if (!isset($random_state)) {
+$random_state = print_r($_SERVER, TRUE);
+if (function_exists('getmypid')) {
+// Further initialize with the somewhat random PHP process ID.
+$random_state .= getmypid();
+}
+$bytes = '';
+}
+do {
+$random_state = hash('sha256', microtime() . mt_rand() . $random_state);
+$bytes .= hash('sha256', mt_rand() . $random_state, TRUE);
+}
+while (strlen($bytes) < $count);
+}
+}
+$output = substr($bytes, 0, $count);
+$bytes = substr($bytes, $count);
+return $output;
+}
+/**
+* Calculates a base-64 encoded, URL-safe sha-256 hmac.
+*
+* @param string $data
+*   String to be validated with the hmac.
+* @param string $key
+*   A secret string key.
+*
+* @return string
+*   A base-64 encoded sha-256 hmac, with + replaced with -, / with _ and
+*   any = padding characters removed.
+*/
+function drupal_hmac_base64($data, $key) {
+// Casting $data and $key to strings here is necessary to avoid empty string
+// results of the hash function if they are not scalar values. As this
+// function is used in security-critical contexts like token validation it is
+// important that it never returns an empty string.
+$hmac = base64_encode(hash_hmac('sha256', (string) $data, (string) $key, TRUE));
+// Modify the hmac so it's safe to use in URLs.
+return strtr($hmac, array('+' => '-', '/' => '_', '=' => ''));
+}
+/**
+* Calculates a base-64 encoded, URL-safe sha-256 hash.
+*
+* @param $data
+*   String to be hashed.
+*
+* @return
+*   A base-64 encoded sha-256 hash, with + replaced with -, / with _ and
+*   any = padding characters removed.
+*/
+function drupal_hash_base64($data) {
+$hash = base64_encode(hash('sha256', $data, TRUE));
+// Modify the hash so it's safe to use in URLs.
+return strtr($hash, array('+' => '-', '/' => '_', '=' => ''));
+}
+/**
+* Merges multiple arrays, recursively, and returns the merged array.
+*
+* This function is similar to PHP's array_merge_recursive() function, but it
+* handles non-array values differently. When merging values that are not both
+* arrays, the latter value replaces the former rather than merging with it.
+*
+* Example:
+* @code
+* $link_options_1 = array('fragment' => 'x', 'attributes' => array('title' => t('X'), 'class' => array('a', 'b')));
+* $link_options_2 = array('fragment' => 'y', 'attributes' => array('title' => t('Y'), 'class' => array('c', 'd')));
+*
+* // This results in array('fragment' => array('x', 'y'), 'attributes' => array('title' => array(t('X'), t('Y')), 'class' => array('a', 'b', 'c', 'd'))).
+* $incorrect = array_merge_recursive($link_options_1, $link_options_2);
+*
+* // This results in array('fragment' => 'y', 'attributes' => array('title' => t('Y'), 'class' => array('a', 'b', 'c', 'd'))).
+* $correct = drupal_array_merge_deep($link_options_1, $link_options_2);
+* @endcode
+*
+* @param ...
+*   Arrays to merge.
+*
+* @return
+*   The merged array.
+*
+* @see drupal_array_merge_deep_array()
+*/
+function drupal_array_merge_deep() {
+$args = func_get_args();
+return drupal_array_merge_deep_array($args);
+}
+/**
+* Merges multiple arrays, recursively, and returns the merged array.
+*
+* This function is equivalent to drupal_array_merge_deep(), except the
+* input arrays are passed as a single array parameter rather than a variable
+* parameter list.
+*
+* The following are equivalent:
+* - drupal_array_merge_deep($a, $b);
+* - drupal_array_merge_deep_array(array($a, $b));
+*
+* The following are also equivalent:
+* - call_user_func_array('drupal_array_merge_deep', $arrays_to_merge);
+* - drupal_array_merge_deep_array($arrays_to_merge);
+*
+* @see drupal_array_merge_deep()
+*/
+function drupal_array_merge_deep_array($arrays) {
+$result = array();
+foreach ($arrays as $array) {
+foreach ($array as $key => $value) {
+// Renumber integer keys as array_merge_recursive() does. Note that PHP
+// automatically converts array keys that are integer strings (e.g., '1')
+// to integers.
+if (is_integer($key)) {
+$result[] = $value;
+}
+// Recurse when both values are arrays.
+elseif (isset($result[$key]) && is_array($result[$key]) && is_array($value)) {
+$result[$key] = drupal_array_merge_deep_array(array($result[$key], $value));
+}
+// Otherwise, use the latter value, overriding any previous value.
+else {
+$result[$key] = $value;
+}
+}
+}
+return $result;
+}
+/**
+* Generates a default anonymous $user object.
+*
+* @return Object - the user object.
+*/
+function drupal_anonymous_user() {
+$user = variable_get('drupal_anonymous_user_object', new stdClass);
+$user->uid = 0;
+$user->hostname = ip_address();
+$user->roles = array();
+$user->roles[DRUPAL_ANONYMOUS_RID] = 'anonymous user';
+$user->cache = 0;
+return $user;
+}
+/**
+* Ensures Drupal is bootstrapped to the specified phase.
+*
+* In order to bootstrap Drupal from another PHP script, you can use this code:
+* @code
+*   define('DRUPAL_ROOT', '/path/to/drupal');
+*   require_once DRUPAL_ROOT . '/includes/bootstrap.inc';
+*   drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
+* @endcode
+*
+* @param int $phase
+*   A constant telling which phase to bootstrap to. When you bootstrap to a
+*   particular phase, all earlier phases are run automatically. Possible
+*   values:
+*   - DRUPAL_BOOTSTRAP_CONFIGURATION: Initializes configuration.
+*   - DRUPAL_BOOTSTRAP_PAGE_CACHE: Tries to serve a cached page.
+*   - DRUPAL_BOOTSTRAP_DATABASE: Initializes the database layer.
+*   - DRUPAL_BOOTSTRAP_VARIABLES: Initializes the variable system.
+*   - DRUPAL_BOOTSTRAP_SESSION: Initializes session handling.
+*   - DRUPAL_BOOTSTRAP_PAGE_HEADER: Sets up the page header.
+*   - DRUPAL_BOOTSTRAP_LANGUAGE: Finds out the language of the page.
+*   - DRUPAL_BOOTSTRAP_FULL: Fully loads Drupal. Validates and fixes input
+*     data.
+* @param boolean $new_phase
+*   A boolean, set to FALSE if calling drupal_bootstrap from inside a
+*   function called from drupal_bootstrap (recursion).
+*
+* @return int
+*   The most recently completed phase.
+*/
+function drupal_bootstrap($phase = NULL, $new_phase = TRUE) {
+// Not drupal_static(), because does not depend on any run-time information.
+static $phases = array(
+DRUPAL_BOOTSTRAP_CONFIGURATION,
+DRUPAL_BOOTSTRAP_PAGE_CACHE,
+DRUPAL_BOOTSTRAP_DATABASE,
+DRUPAL_BOOTSTRAP_VARIABLES,
+DRUPAL_BOOTSTRAP_SESSION,
+DRUPAL_BOOTSTRAP_PAGE_HEADER,
+DRUPAL_BOOTSTRAP_LANGUAGE,
+DRUPAL_BOOTSTRAP_FULL,
+);
+// Not drupal_static(), because the only legitimate API to control this is to
+// call drupal_bootstrap() with a new phase parameter.
+static $final_phase;
+// Not drupal_static(), because it's impossible to roll back to an earlier
+// bootstrap state.
+static $stored_phase = -1;
+if (isset($phase)) {
+// When not recursing, store the phase name so it's not forgotten while
+// recursing but take care of not going backwards.
+if ($new_phase && $phase >= $stored_phase) {
+$final_phase = $phase;
+}
+// Call a phase if it has not been called before and is below the requested
+// phase.
+while ($phases && $phase > $stored_phase && $final_phase > $stored_phase) {
+$current_phase = array_shift($phases);
+// This function is re-entrant. Only update the completed phase when the
+// current call actually resulted in a progress in the bootstrap process.
+if ($current_phase > $stored_phase) {
+$stored_phase = $current_phase;
+}
+switch ($current_phase) {
+case DRUPAL_BOOTSTRAP_CONFIGURATION:
+_drupal_bootstrap_configuration();
+break;
+case DRUPAL_BOOTSTRAP_PAGE_CACHE:
+_drupal_bootstrap_page_cache();
+break;
+case DRUPAL_BOOTSTRAP_DATABASE:
+_drupal_bootstrap_database();
+break;
+case DRUPAL_BOOTSTRAP_VARIABLES:
+_drupal_bootstrap_variables();
+break;
+case DRUPAL_BOOTSTRAP_SESSION:
+require_once DRUPAL_ROOT . '/' . variable_get('session_inc', 'includes/session.inc');
+drupal_session_initialize();
+break;
+case DRUPAL_BOOTSTRAP_PAGE_HEADER:
+_drupal_bootstrap_page_header();
+break;
+case DRUPAL_BOOTSTRAP_LANGUAGE:
+drupal_language_initialize();
+break;
+case DRUPAL_BOOTSTRAP_FULL:
+require_once DRUPAL_ROOT . '/includes/common.inc';
+_drupal_bootstrap_full();
+break;
+}
+}
+}
+return $stored_phase;
+}
+/**
+* Returns the time zone of the current user.
+*/
+function drupal_get_user_timezone() {
+global $user;
+if (variable_get('configurable_timezones', 1) && $user->uid && $user->timezone) {
+return $user->timezone;
+}
+else {
+// Ignore PHP strict notice if time zone has not yet been set in the php.ini
+// configuration.
+return variable_get('date_default_timezone', @date_default_timezone_get());
+}
+}
+/**
+* Gets a salt useful for hardening against SQL injection.
+*
+* @return
+*   A salt based on information in settings.php, not in the database.
+*/
+function drupal_get_hash_salt() {
+global $drupal_hash_salt, $databases;
+// If the $drupal_hash_salt variable is empty, a hash of the serialized
+// database credentials is used as a fallback salt.
+return empty($drupal_hash_salt) ? hash('sha256', serialize($databases)) : $drupal_hash_salt;
+}
+/**
+* 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, $context) {
+require_once DRUPAL_ROOT . '/includes/errors.inc';
+_drupal_error_handler_real($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 $exception
+*   The exception object that was thrown.
+*/
+function _drupal_exception_handler($exception) {
+require_once DRUPAL_ROOT . '/includes/errors.inc';
+try {
+// Log the message to the watchdog and return an error page to the user.
+_drupal_log_error(_drupal_decode_exception($exception), TRUE);
+}
+catch (Exception $exception2) {
+// Another uncaught exception was thrown while handling the first one.
+// If we are displaying errors, then do so with no possibility of a further uncaught exception being thrown.
+if (error_displayable()) {
+print '<h1>Additional uncaught exception thrown while handling exception.</h1>';
+print '<h2>Original</h2><p>' . _drupal_render_exception_safe($exception) . '</p>';
+print '<h2>Additional</h2><p>' . _drupal_render_exception_safe($exception2) . '</p><hr />';
+}
+}
+}
+/**
+* Sets up the script environment and loads settings.php.
+*/
+function _drupal_bootstrap_configuration() {
+// Set the Drupal custom error handler.
+set_error_handler('_drupal_error_handler');
+set_exception_handler('_drupal_exception_handler');
+drupal_environment_initialize();
+// Start a page timer:
+timer_start('page');
+// Initialize the configuration, including variables from settings.php.
+drupal_settings_initialize();
+}
+/**
+* Attempts to serve a page from the cache.
+*/
+function _drupal_bootstrap_page_cache() {
+global $user;
+// Allow specifying special cache handlers in settings.php, like
+// using memcached or files for storing cache information.
+require_once DRUPAL_ROOT . '/includes/cache.inc';
+foreach (variable_get('cache_backends', array()) as $include) {
+require_once DRUPAL_ROOT . '/' . $include;
+}
+// Check for a cache mode force from settings.php.
+if (variable_get('page_cache_without_database')) {
+$cache_enabled = TRUE;
+}
+else {
+drupal_bootstrap(DRUPAL_BOOTSTRAP_VARIABLES, FALSE);
+$cache_enabled = variable_get('cache');
+}
+drupal_block_denied(ip_address());
+// If there is no session cookie and cache is enabled (or forced), try
+// to serve a cached page.
+if (!isset($_COOKIE[session_name()]) && $cache_enabled) {
+// Make sure there is a user object because its timestamp will be
+// checked, hook_boot might check for anonymous user etc.
+$user = drupal_anonymous_user();
+// Get the page from the cache.
+$cache = drupal_page_get_cache();
+// If there is a cached page, display it.
+if (is_object($cache)) {
+header('X-Drupal-Cache: HIT');
+// Restore the metadata cached with the page.
+$_GET['q'] = $cache->data['path'];
+drupal_set_title($cache->data['title'], PASS_THROUGH);
+date_default_timezone_set(drupal_get_user_timezone());
+// If the skipping of the bootstrap hooks is not enforced, call
+// hook_boot.
+if (variable_get('page_cache_invoke_hooks', TRUE)) {
+bootstrap_invoke_all('boot');
+}
+drupal_serve_page_from_cache($cache);
+// If the skipping of the bootstrap hooks is not enforced, call
+// hook_exit.
+if (variable_get('page_cache_invoke_hooks', TRUE)) {
+bootstrap_invoke_all('exit');
+}
+// We are done.
+exit;
+}
+else {
+header('X-Drupal-Cache: MISS');
+}
+}
+}
+/**
+* Initializes the database system and registers autoload functions.
+*/
+function _drupal_bootstrap_database() {
+// Redirect the user to the installation script if Drupal has not been
+// installed yet (i.e., if no $databases array has been defined in the
+// settings.php file) and we are not already installing.
+if (empty($GLOBALS['databases']) && !drupal_installation_attempted()) {
+include_once DRUPAL_ROOT . '/includes/install.inc';
+install_goto('install.php');
+}
+// The user agent header is used to pass a database prefix in the request when
+// running tests. However, for security reasons, it is imperative that we
+// validate we ourselves made the request.
+if ($test_prefix = drupal_valid_test_ua()) {
+// Set the test run id for use in other parts of Drupal.
+$test_info = &$GLOBALS['drupal_test_info'];
+$test_info['test_run_id'] = $test_prefix;
+$test_info['in_child_site'] = TRUE;
+foreach ($GLOBALS['databases']['default'] as &$value) {
+// Extract the current default database prefix.
+if (!isset($value['prefix'])) {
+$current_prefix = '';
+}
+elseif (is_array($value['prefix'])) {
+$current_prefix = $value['prefix']['default'];
+}
+else {
+$current_prefix = $value['prefix'];
+}
+// Remove the current database prefix and replace it by our own.
+$value['prefix'] = array(
+'default' => $current_prefix . $test_prefix,
+);
+}
+}
+// Initialize the database system. Note that the connection
+// won't be initialized until it is actually requested.
+require_once DRUPAL_ROOT . '/includes/database/database.inc';
+// Register autoload functions so that we can access classes and interfaces.
+// The database autoload routine comes first so that we can load the database
+// system without hitting the database. That is especially important during
+// the install or upgrade process.
+spl_autoload_register('drupal_autoload_class');
+spl_autoload_register('drupal_autoload_interface');
+if (version_compare(PHP_VERSION, '5.4') >= 0) {
+spl_autoload_register('drupal_autoload_trait');
+}
+}
+/**
+* Loads system variables and all enabled bootstrap modules.
+*/
+function _drupal_bootstrap_variables() {
+global $conf;
+// Initialize the lock system.
+require_once DRUPAL_ROOT . '/' . variable_get('lock_inc', 'includes/lock.inc');
+lock_initialize();
+// Load variables from the database, but do not overwrite variables set in settings.php.
+$conf = variable_initialize(isset($conf) ? $conf : array());
+// Load bootstrap modules.
+require_once DRUPAL_ROOT . '/includes/module.inc';
+module_load_all(TRUE);
+// Sanitize the destination parameter (which is often used for redirects) to
+// prevent open redirect attacks leading to other domains. Sanitize both
+// $_GET['destination'] and $_REQUEST['destination'] to protect code that
+// relies on either, but do not sanitize $_POST to avoid interfering with
+// unrelated form submissions. The sanitization happens here because
+// url_is_external() requires the variable system to be available.
+if (isset($_GET['destination']) || isset($_REQUEST['destination'])) {
+require_once DRUPAL_ROOT . '/includes/common.inc';
+// If the destination is an external URL, remove it.
+if (isset($_GET['destination']) && url_is_external($_GET['destination'])) {
+unset($_GET['destination']);
+unset($_REQUEST['destination']);
+}
+// If there's still something in $_REQUEST['destination'] that didn't come
+// from $_GET, check it too.
+if (isset($_REQUEST['destination']) && (!isset($_GET['destination']) || $_REQUEST['destination'] != $_GET['destination']) && url_is_external($_REQUEST['destination'])) {
+unset($_REQUEST['destination']);
+}
+}
+}
+/**
+* Invokes hook_boot(), initializes locking system, and sends HTTP headers.
+*/
+function _drupal_bootstrap_page_header() {
+bootstrap_invoke_all('boot');
+if (!drupal_is_cli()) {
+ob_start();
+drupal_page_header();
+}
+}
+/**
+* Returns the current bootstrap phase for this Drupal process.
+*
+* The current phase is the one most recently completed by drupal_bootstrap().
+*
+* @see drupal_bootstrap()
+*/
+function drupal_get_bootstrap_phase() {
+return drupal_bootstrap(NULL, FALSE);
+}
+/**
+* Returns the test prefix if this is an internal request from SimpleTest.
+*
+* @return
+*   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() {
+// No reason to reset this.
+static $test_prefix;
+if (isset($test_prefix)) {
+return $test_prefix;
+}
+if (isset($_SERVER['HTTP_USER_AGENT']) && preg_match("/^(simpletest\d+);(.+);(.+);(.+)$/", $_SERVER['HTTP_USER_AGENT'], $matches)) {
+list(, $prefix, $time, $salt, $hmac) = $matches;
+$check_string =  $prefix . ';' . $time . ';' . $salt;
+// We use the salt from settings.php to make the HMAC key, since
+// the database is not yet initialized and we can't access any Drupal variables.
+// The file properties add more entropy not easily accessible to others.
+$key = drupal_get_hash_salt() . filectime(__FILE__) . fileinode(__FILE__);
+$time_diff = REQUEST_TIME - $time;
+// Since we are making a local request a 5 second time window is allowed,
+// and the HMAC must match.
+if ($time_diff >= 0 && $time_diff <= 5 && $hmac == drupal_hmac_base64($check_string, $key)) {
+$test_prefix = $prefix;
+return $test_prefix;
+}
+}
+$test_prefix = FALSE;
+return $test_prefix;
+}
+/**
+* Generates a user agent string with a HMAC and timestamp for simpletest.
+*/
+function drupal_generate_test_ua($prefix) {
+static $key;
+if (!isset($key)) {
+// We use the salt from settings.php to make the HMAC key, since
+// the database is not yet initialized and we can't access any Drupal variables.
+// The file properties add more entropy not easily accessible to others.
+$key = drupal_get_hash_salt() . filectime(__FILE__) . fileinode(__FILE__);
+}
+// Generate a moderately secure HMAC based on the database credentials.
+$salt = uniqid('', TRUE);
+$check_string = $prefix . ';' . time() . ';' . $salt;
+return $check_string . ';' . drupal_hmac_base64($check_string, $key);
+}
+/**
+* Enables use of the theme system without requiring database access.
+*
+* Loads and initializes the theme system for site installs, updates and when
+* the site is in maintenance mode. This also applies when the database fails.
+*
+* @see _drupal_maintenance_theme()
+*/
+function drupal_maintenance_theme() {
+require_once DRUPAL_ROOT . '/includes/theme.maintenance.inc';
+_drupal_maintenance_theme();
+}
+/**
+* Returns a simple 404 Not Found page.
+*
+* If fast 404 pages are enabled, and this is a matching page then print a
+* simple 404 page and exit.
+*
+* This function is called from drupal_deliver_html_page() at the time when a
+* a normal 404 page is generated, but it can also optionally be called directly
+* from settings.php to prevent a Drupal bootstrap on these pages. See
+* documentation in settings.php for the benefits and drawbacks of using this.
+*
+* Paths to dynamically-generated content, such as image styles, should also be
+* accounted for in this function.
+*/
+function drupal_fast_404() {
+$exclude_paths = variable_get('404_fast_paths_exclude', FALSE);
+if ($exclude_paths && !preg_match($exclude_paths, $_GET['q'])) {
+$fast_paths = variable_get('404_fast_paths', FALSE);
+if ($fast_paths && preg_match($fast_paths, $_GET['q'])) {
+drupal_add_http_header('Status', '404 Not Found');
+$fast_404_html = variable_get('404_fast_html', '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML+RDFa 1.0//EN" "http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><title>404 Not Found</title></head><body><h1>Not Found</h1><p>The requested URL "@path" was not found on this server.</p></body></html>');
+// Replace @path in the variable with the page path.
+print strtr($fast_404_html, array('@path' => check_plain(request_uri())));
+exit;
+}
+}
+}
+/**
+* Returns TRUE if a Drupal installation is currently being attempted.
+*/
+function drupal_installation_attempted() {
+return defined('MAINTENANCE_MODE') && MAINTENANCE_MODE == 'install';
+}
+/**
+* Returns the name of the proper localization function.
+*
+* get_t() exists to support localization for code that might run during
+* the installation phase, when some elements of the system might not have
+* loaded.
+*
+* This would include implementations of hook_install(), which could run
+* during the Drupal installation phase, and might also be run during
+* non-installation time, such as while installing the module from the
+* module administration page.
+*
+* Example usage:
+* @code
+*   $t = get_t();
+*   $translated = $t('translate this');
+* @endcode
+*
+* Use t() if your code will never run during the Drupal installation phase.
+* Use st() if your code will only run during installation and never any other
+* time. Use get_t() if your code could run in either circumstance.
+*
+* @see t()
+* @see st()
+* @ingroup sanitization
+*/
+function get_t() {
+static $t;
+// This is not converted to drupal_static because there is no point in
+// resetting this as it can not change in the course of a request.
+if (!isset($t)) {
+$t = drupal_installation_attempted() ? 'st' : 't';
+}
+return $t;
+}
+/**
+* Initializes all the defined language types.
+*/
+function drupal_language_initialize() {
+$types = language_types();
+// Ensure the language is correctly returned, even without multilanguage
+// support. Also make sure we have a $language fallback, in case a language
+// negotiation callback needs to do a full bootstrap.
+// Useful for eg. XML/HTML 'lang' attributes.
+$default = language_default();
+foreach ($types as $type) {
+$GLOBALS[$type] = $default;
+}
+if (drupal_multilingual()) {
+include_once DRUPAL_ROOT . '/includes/language.inc';
+foreach ($types as $type) {
+$GLOBALS[$type] = language_initialize($type);
+}
+// Allow modules to react on language system initialization in multilingual
+// environments.
+bootstrap_invoke_all('language_init');
+}
+}
+/**
+* Returns a list of the built-in language types.
+*
+* @return
+*   An array of key-values pairs where the key is the language type and the
+*   value is its configurability.
+*/
+function drupal_language_types() {
+return array(
+LANGUAGE_TYPE_INTERFACE => TRUE,
+LANGUAGE_TYPE_CONTENT => FALSE,
+LANGUAGE_TYPE_URL => FALSE,
+);
+}
+/**
+* Returns TRUE if there is more than one language enabled.
+*
+* @return
+*   TRUE if more than one language is enabled.
+*/
+function drupal_multilingual() {
+// The "language_count" variable stores the number of enabled languages to
+// avoid unnecessarily querying the database when building the list of
+// enabled languages on monolingual sites.
+return variable_get('language_count', 1) > 1;
+}
+/**
+* Returns an array of the available language types.
+*
+* @return
+*   An array of all language types where the keys of each are the language type
+*   name and its value is its configurability (TRUE/FALSE).
+*/
+function language_types() {
+return array_keys(variable_get('language_types', drupal_language_types()));
+}
+/**
+* Returns a list of installed languages, indexed by the specified key.
+*
+* @param $field
+*   (optional) The field to index the list with.
+*
+* @return
+*   An associative array, keyed on the values of $field.
+*   - If $field is 'weight' or 'enabled', the array is nested, with the outer
+*     array's values each being associative arrays with language codes as
+*     keys and language objects as values.
+*   - For all other values of $field, the array is only one level deep, and
+*     the array's values are language objects.
+*/
+function language_list($field = 'language') {
+$languages = &drupal_static(__FUNCTION__);
+// Init language list
+if (!isset($languages)) {
+if (drupal_multilingual() || module_exists('locale')) {
+$languages['language'] = db_query('SELECT * FROM {languages} ORDER BY weight ASC, name ASC')->fetchAllAssoc('language');
+// Users cannot uninstall the native English language. However, we allow
+// it to be hidden from the installed languages. Therefore, at least one
+// other language must be enabled then.
+if (!$languages['language']['en']->enabled && !variable_get('language_native_enabled', TRUE)) {
+unset($languages['language']['en']);
+}
+}
+else {
+// No locale module, so use the default language only.
+$default = language_default();
+$languages['language'][$default->language] = $default;
+}
+}
+// Return the array indexed by the right field
+if (!isset($languages[$field])) {
+$languages[$field] = array();
+foreach ($languages['language'] as $lang) {
+// Some values should be collected into an array
+if (in_array($field, array('enabled', 'weight'))) {
+$languages[$field][$lang->$field][$lang->language] = $lang;
+}
+else {
+$languages[$field][$lang->$field] = $lang;
+}
+}
+}
+return $languages[$field];
+}
+/**
+* Returns the default language, as an object, or one of its properties.
+*
+* @param $property
+*   (optional) The property of the language object to return.
+*
+* @return
+*   Either the language object for the default language used on the site,
+*   or the property of that object named in the $property parameter.
+*/
+function language_default($property = NULL) {
+$language = variable_get('language_default', (object) array('language' => 'en', 'name' => 'English', 'native' => 'English', 'direction' => 0, 'enabled' => 1, 'plurals' => 0, 'formula' => '', 'domain' => '', 'prefix' => '', 'weight' => 0, 'javascript' => ''));
+return $property ? $language->$property : $language;
+}
+/**
+* Returns the requested URL path of the page being viewed.
+*
+* Examples:
+* - http://example.com/node/306 returns "node/306".
+* - http://example.com/drupalfolder/node/306 returns "node/306" while
+*   base_path() returns "/drupalfolder/".
+* - http://example.com/path/alias (which is a path alias for node/306) returns
+*   "path/alias" as opposed to the internal path.
+* - http://example.com/index.php returns an empty string (meaning: front page).
+* - http://example.com/index.php?page=1 returns an empty string.
+*
+* @return
+*   The requested Drupal URL path.
+*
+* @see current_path()
+*/
+function request_path() {
+static $path;
+if (isset($path)) {
+return $path;
+}
+if (isset($_GET['q']) && is_string($_GET['q'])) {
+// This is a request with a ?q=foo/bar query string. $_GET['q'] is
+// overwritten in drupal_path_initialize(), but request_path() is called
+// very early in the bootstrap process, so the original value is saved in
+// $path and returned in later calls.
+$path = $_GET['q'];
+}
+elseif (isset($_SERVER['REQUEST_URI'])) {
+// This request is either a clean URL, or 'index.php', or nonsense.
+// Extract the path from REQUEST_URI.
+$request_path = strtok($_SERVER['REQUEST_URI'], '?');
+$base_path_len = strlen(rtrim(dirname($_SERVER['SCRIPT_NAME']), '\/'));
+// Unescape and strip $base_path prefix, leaving q without a leading slash.
+$path = substr(urldecode($request_path), $base_path_len + 1);
+// If the path equals the script filename, either because 'index.php' was
+// explicitly provided in the URL, or because the server added it to
+// $_SERVER['REQUEST_URI'] even when it wasn't provided in the URL (some
+// versions of Microsoft IIS do this), the front page should be served.
+if ($path == basename($_SERVER['PHP_SELF'])) {
+$path = '';
+}
+}
+else {
+// This is the front page.
+$path = '';
+}
+// Under certain conditions Apache's RewriteRule directive prepends the value
+// assigned to $_GET['q'] with a slash. Moreover we can always have a trailing
+// slash in place, hence we need to normalize $_GET['q'].
+$path = trim($path, '/');
+return $path;
+}
+/**
+* Returns a component of the current Drupal path.
+*
+* When viewing a page at the path "admin/structure/types", for example, arg(0)
+* returns "admin", arg(1) returns "structure", and arg(2) returns "types".
+*
+* Avoid use of this function where possible, as resulting code is hard to
+* read. In menu callback functions, attempt to use named arguments. See the
+* explanation in menu.inc for how to construct callbacks that take arguments.
+* When attempting to use this function to load an element from the current
+* path, e.g. loading the node on a node page, use menu_get_object() instead.
+*
+* @param $index
+*   The index of the component, where each component is separated by a '/'
+*   (forward-slash), and where the first component has an index of 0 (zero).
+* @param $path
+*   A path to break into components. Defaults to the path of the current page.
+*
+* @return
+*   The component specified by $index, or NULL if the specified component was
+*   not found. If called without arguments, it returns an array containing all
+*   the components of the current path.
+*/
+function arg($index = NULL, $path = NULL) {
+// Even though $arguments doesn't need to be resettable for any functional
+// reasons (the result of explode() does not depend on any run-time
+// information), it should be resettable anyway in case a module needs to
+// free up the memory used by it.
+// Use the advanced drupal_static() pattern, since this is called very often.
+static $drupal_static_fast;
+if (!isset($drupal_static_fast)) {
+$drupal_static_fast['arguments'] = &drupal_static(__FUNCTION__);
+}
+$arguments = &$drupal_static_fast['arguments'];
+if (!isset($path)) {
+$path = $_GET['q'];
+}
+if (!isset($arguments[$path])) {
+$arguments[$path] = explode('/', $path);
+}
+if (!isset($index)) {
+return $arguments[$path];
+}
+if (isset($arguments[$path][$index])) {
+return $arguments[$path][$index];
+}
+}
+/**
+* Returns the IP address of the client machine.
+*
+* If Drupal is behind a reverse proxy, we use the X-Forwarded-For header
+* instead of $_SERVER['REMOTE_ADDR'], which would be the IP address of
+* the proxy server, and not the client's. The actual header name can be
+* configured by the reverse_proxy_header variable.
+*
+* @return
+*   IP address of client machine, adjusted for reverse proxy and/or cluster
+*   environments.
+*/
+function ip_address() {
+$ip_address = &drupal_static(__FUNCTION__);
+if (!isset($ip_address)) {
+$ip_address = $_SERVER['REMOTE_ADDR'];
+if (variable_get('reverse_proxy', 0)) {
+$reverse_proxy_header = variable_get('reverse_proxy_header', 'HTTP_X_FORWARDED_FOR');
+if (!empty($_SERVER[$reverse_proxy_header])) {
+// If an array of known reverse proxy IPs is provided, then trust
+// the XFF header if request really comes from one of them.
+$reverse_proxy_addresses = variable_get('reverse_proxy_addresses', array());
+// Turn XFF header into an array.
+$forwarded = explode(',', $_SERVER[$reverse_proxy_header]);
+// Trim the forwarded IPs; they may have been delimited by commas and spaces.
+$forwarded = array_map('trim', $forwarded);
+// Tack direct client IP onto end of forwarded array.
+$forwarded[] = $ip_address;
+// Eliminate all trusted IPs.
+$untrusted = array_diff($forwarded, $reverse_proxy_addresses);
+if (!empty($untrusted)) {
+// The right-most IP is the most specific we can trust.
+$ip_address = array_pop($untrusted);
+}
+else {
+// All IP addresses in the forwarded array are configured proxy IPs
+// (and thus trusted). We take the leftmost IP.
+$ip_address = array_shift($forwarded);
+}
+}
+}
+}
+return $ip_address;
+}
+/**
+* @addtogroup schemaapi
+* @{
+*/
+/**
+* Gets the schema definition of a table, or the whole database schema.
+*
+* The returned schema will include any modifications made by any
+* module that implements hook_schema_alter(). To get the schema without
+* modifications, use drupal_get_schema_unprocessed().
+*
+*
+* @param $table
+*   The name of the table. If not given, the schema of all tables is returned.
+* @param $rebuild
+*   If true, the schema will be rebuilt instead of retrieved from the cache.
+*/
+function drupal_get_schema($table = NULL, $rebuild = FALSE) {
+static $schema;
+if ($rebuild || !isset($table)) {
+$schema = drupal_get_complete_schema($rebuild);
+}
+elseif (!isset($schema)) {
+$schema = new SchemaCache();
+}
+if (!isset($table)) {
+return $schema;
+}
+if (isset($schema[$table])) {
+return $schema[$table];
+}
+else {
+return FALSE;
+}
+}
+/**
+* Extends DrupalCacheArray to allow for dynamic building of the schema cache.
+*/
+class SchemaCache extends DrupalCacheArray {
+/**
+* Constructs a SchemaCache object.
+*/
+public function __construct() {
+// Cache by request method.
+parent::__construct('schema:runtime:' . ($_SERVER['REQUEST_METHOD'] == 'GET'), 'cache');
+}
+/**
+* Overrides DrupalCacheArray::resolveCacheMiss().
+*/
+protected function resolveCacheMiss($offset) {
+$complete_schema = drupal_get_complete_schema();
+$value = isset($complete_schema[$offset]) ? $complete_schema[$offset] :  NULL;
+$this->storage[$offset] = $value;
+$this->persist($offset);
+return $value;
+}
+}
+/**
+* Gets the whole database schema.
+*
+* The returned schema will include any modifications made by any
+* module that implements hook_schema_alter().
+*
+* @param $rebuild
+*   If true, the schema will be rebuilt instead of retrieved from the cache.
+*/
+function drupal_get_complete_schema($rebuild = FALSE) {
+static $schema = array();
+if (empty($schema) || $rebuild) {
+// Try to load the schema from cache.
+if (!$rebuild && $cached = cache_get('schema')) {
+$schema = $cached->data;
+}
+// Otherwise, rebuild the schema cache.
+else {
+$schema = array();
+// Load the .install files to get hook_schema.
+// On some databases this function may be called before bootstrap has
+// been completed, so we force the functions we need to load just in case.
+if (function_exists('module_load_all_includes')) {
+// This function can be called very early in the bootstrap process, so
+// we force the module_list() cache to be refreshed to ensure that it
+// contains the complete list of modules before we go on to call
+// module_load_all_includes().
+module_list(TRUE);
+module_load_all_includes('install');
+}
+require_once DRUPAL_ROOT . '/includes/common.inc';
+// Invoke hook_schema for all modules.
+foreach (module_implements('schema') as $module) {
+// Cast the result of hook_schema() to an array, as a NULL return value
+// would cause array_merge() to set the $schema variable to NULL as well.
+// That would break modules which use $schema further down the line.
+$current = (array) module_invoke($module, 'schema');
+// Set 'module' and 'name' keys for each table, and remove descriptions,
+// as they needlessly slow down cache_get() for every single request.
+_drupal_schema_initialize($current, $module);
+$schema = array_merge($schema, $current);
+}
+drupal_alter('schema', $schema);
+// If the schema is empty, avoid saving it: some database engines require
+// the schema to perform queries, and this could lead to infinite loops.
+if (!empty($schema) && (drupal_get_bootstrap_phase() == DRUPAL_BOOTSTRAP_FULL)) {
+cache_set('schema', $schema);
+}
+if ($rebuild) {
+cache_clear_all('schema:', 'cache', TRUE);
+}
+}
+}
+return $schema;
+}
+/**
+* @} End of "addtogroup schemaapi".
+*/
+/**
+* @addtogroup registry
+* @{
+*/
+/**
+* Confirms that an interface is available.
+*
+* This function is rarely called directly. Instead, it is registered as an
+* spl_autoload()  handler, and PHP calls it for us when necessary.
+*
+* @param $interface
+*   The name of the interface to check or load.
+*
+* @return
+*   TRUE if the interface is currently available, FALSE otherwise.
+*/
+function drupal_autoload_interface($interface) {
+return _registry_check_code('interface', $interface);
+}
+/**
+* Confirms that a class is available.
+*
+* This function is rarely called directly. Instead, it is registered as an
+* spl_autoload()  handler, and PHP calls it for us when necessary.
+*
+* @param $class
+*   The name of the class to check or load.
+*
+* @return
+*   TRUE if the class is currently available, FALSE otherwise.
+*/
+function drupal_autoload_class($class) {
+return _registry_check_code('class', $class);
+}
+/**
+* Confirms that a trait is available.
+*
+* This function is rarely called directly. Instead, it is registered as an
+* spl_autoload() handler, and PHP calls it for us when necessary.
+*
+* @param string $trait
+*   The name of the trait to check or load.
+*
+* @return bool
+*   TRUE if the trait is currently available, FALSE otherwise.
+*/
+function drupal_autoload_trait($trait) {
+return _registry_check_code('trait', $trait);
+}
+/**
+* Checks for a resource in the registry.
+*
+* @param $type
+*   The type of resource we are looking up, or one of the constants
+*   REGISTRY_RESET_LOOKUP_CACHE or REGISTRY_WRITE_LOOKUP_CACHE, which
+*   signal that we should reset or write the cache, respectively.
+* @param $name
+*   The name of the resource, or NULL if either of the REGISTRY_* constants
+*   is passed in.
+*
+* @return
+*   TRUE if the resource was found, FALSE if not.
+*   NULL if either of the REGISTRY_* constants is passed in as $type.
+*/
+function _registry_check_code($type, $name = NULL) {
+static $lookup_cache, $cache_update_needed;
+if ($type == 'class' && class_exists($name) || $type == 'interface' && interface_exists($name) || $type == 'trait' && trait_exists($name)) {
+return TRUE;
+}
+if (!isset($lookup_cache)) {
+$lookup_cache = array();
+if ($cache = cache_get('lookup_cache', 'cache_bootstrap')) {
+$lookup_cache = $cache->data;
+}
+}
+// When we rebuild the registry, we need to reset this cache so
+// we don't keep lookups for resources that changed during the rebuild.
+if ($type == REGISTRY_RESET_LOOKUP_CACHE) {
+$cache_update_needed = TRUE;
+$lookup_cache = NULL;
+return;
+}
+// Called from drupal_page_footer, we write to permanent storage if there
+// changes to the lookup cache for this request.
+if ($type == REGISTRY_WRITE_LOOKUP_CACHE) {
+if ($cache_update_needed) {
+cache_set('lookup_cache', $lookup_cache, 'cache_bootstrap');
+}
+return;
+}
+// $type is either 'interface' or 'class', so we only need the first letter to
+// keep the cache key unique.
+$cache_key = $type[0] . $name;
+if (isset($lookup_cache[$cache_key])) {
+if ($lookup_cache[$cache_key]) {
+include_once DRUPAL_ROOT . '/' . $lookup_cache[$cache_key];
+}
+return (bool) $lookup_cache[$cache_key];
+}
+// This function may get called when the default database is not active, but
+// there is no reason we'd ever want to not use the default database for
+// this query.
+$file = Database::getConnection('default', 'default')
+->select('registry', 'r', array('target' => 'default'))
+->fields('r', array('filename'))
+// Use LIKE here to make the query case-insensitive.
+->condition('r.name', db_like($name), 'LIKE')
+->condition('r.type', $type)
+->execute()
+->fetchField();
+// Flag that we've run a lookup query and need to update the cache.
+$cache_update_needed = TRUE;
+// Misses are valuable information worth caching, so cache even if
+// $file is FALSE.
+$lookup_cache[$cache_key] = $file;
+if ($file) {
+include_once DRUPAL_ROOT . '/' . $file;
+return TRUE;
+}
+else {
+return FALSE;
+}
+}
+/**
+* Rescans all enabled modules and rebuilds the registry.
+*
+* Rescans all code in modules or includes directories, storing the location of
+* each interface or class in the database.
+*/
+function registry_rebuild() {
+system_rebuild_module_data();
+registry_update();
+}
+/**
+* Updates the registry based on the latest files listed in the database.
+*
+* This function should be used when system_rebuild_module_data() does not need
+* to be called, because it is already known that the list of files in the
+* {system} table matches those in the file system.
+*
+* @return
+*   TRUE if the registry was rebuilt, FALSE if another thread was rebuilding
+*   in parallel and the current thread just waited for completion.
+*
+* @see registry_rebuild()
+*/
+function registry_update() {
+// install_system_module() calls module_enable() which calls into this
+// function during initial system installation, so the lock system is neither
+// loaded nor does its storage exist yet.
+$in_installer = drupal_installation_attempted();
+if (!$in_installer && !lock_acquire(__FUNCTION__)) {
+// Another request got the lock, wait for it to finish.
+lock_wait(__FUNCTION__);
+return FALSE;
+}
+require_once DRUPAL_ROOT . '/includes/registry.inc';
+_registry_update();
+if (!$in_installer) {
+lock_release(__FUNCTION__);
+}
+return TRUE;
+}
+/**
+* @} End of "addtogroup registry".
+*/
+/**
+* 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 language_list($field = 'language') {
+*   $languages = &drupal_static(__FUNCTION__);
+*   if (!isset($languages)) {
+*     // 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 about the supported languages.
+*     ...
+*   }
+*   if (!isset($languages[$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 $languages 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 $languages[$field];
+* }
+* function locale_translate_overview_screen() {
+*   // When building the content for the translations overview page, make
+*   // sure to get completely fresh information about the supported languages.
+*   drupal_static_reset('language_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 actions_do(...) {
+*   // $stack tracks the number of recursive calls.
+*   static $stack;
+*   $stack++;
+*   if ($stack > variable_get('actions_max_stack', 35)) {
+*     ...
+*     return;
+*   }
+*   ...
+*   $stack--;
+* }
+* @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 $foo = &drupal_static(__FUNCTION__);
+* @endcode
+* However, the above line of code does not work, because PHP only allows static
+* variables to be initializied by literal values, and does not allow static
+* variables to be assigned to references.
+* - http://php.net/manual/language.variables.scope.php#language.variables.scope.static
+* - http://php.net/manual/language.variables.scope.php#language.variables.scope.references
+* The example below shows the syntax needed to work around both limitations.
+* For benchmarks and more information, see http://drupal.org/node/619666.
+*
+* Example:
+* @code
+* function user_access($string, $account = NULL) {
+*   // Use the advanced drupal_static() pattern, since this is called very often.
+*   static $drupal_static_fast;
+*   if (!isset($drupal_static_fast)) {
+*     $drupal_static_fast['perm'] = &drupal_static(__FUNCTION__);
+*   }
+*   $perm = &$drupal_static_fast['perm'];
+*   ...
+* }
+* @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($name, NULL, TRUE);
+}
+/**
+* Detects whether the current script is running in a command-line environment.
+*/
+function drupal_is_cli() {
+return (!isset($_SERVER['SERVER_SOFTWARE']) && (php_sapi_name() == 'cli' || (is_numeric($_SERVER['argc']) && $_SERVER['argc'] > 0)));
+}
+/**
+* Formats text for emphasized display in a placeholder inside a sentence.
+*
+* Used automatically by format_string().
+*
+* @param $text
+*   The text to format (plain-text).
+*
+* @return
+*   The formatted text (html).
+*/
+function drupal_placeholder($text) {
+return '<em class="placeholder">' . check_plain($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();
+array_shift($args);
+// Save callback and arguments
+$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']);
+}
+}
+catch (Exception $exception) {
+// If we are displaying errors, then do so with no possibility of a further uncaught exception being thrown.
+require_once DRUPAL_ROOT . '/includes/errors.inc';
+if (error_displayable()) {
+print '<h1>Uncaught exception thrown in shutdown function.</h1>';
+print '<p>' . _drupal_render_exception_safe($exception) . '</p><hr />';
+}
+}
+}
+/**
+* Compares the memory required for an operation to the available memory.
+*
+* @param $required
+*   The memory required for the operation, expressed as a number of bytes with
+*   optional SI or IEC binary unit prefix (e.g. 2, 3K, 5MB, 10G, 6GiB, 8bytes,
+*   9mbytes).
+* @param $memory_limit
+*   (optional) The memory limit for the operation, expressed as a number of
+*   bytes with optional SI or IEC binary unit prefix (e.g. 2, 3K, 5MB, 10G,
+*   6GiB, 8bytes, 9mbytes). If no value is passed, the current PHP
+*   memory_limit will be used. Defaults to NULL.
+*
+* @return
+*   TRUE if there is sufficient memory to allow the operation, or FALSE
+*   otherwise.
+*/
+function drupal_check_memory_limit($required, $memory_limit = NULL) {
+if (!isset($memory_limit)) {
+$memory_limit = ini_get('memory_limit');
+}
+// There is sufficient memory if:
+// - No memory limit is set.
+// - The memory limit is set to unlimited (-1).
+// - The memory limit is greater than the memory required for the operation.
+return ((!$memory_limit) || ($memory_limit == -1) || (parse_size($memory_limit) >= parse_size($required)));
+}
+/**
+* Invalidates a PHP file from any active opcode caches.
+*
+* If the opcode cache does not support the invalidation of individual files,
+* the entire cache will be flushed.
+*
+* @param string $filepath
+*   The absolute path of the PHP file to invalidate.
+*/
+function drupal_clear_opcode_cache($filepath) {
+if (!defined('PHP_VERSION_ID') || PHP_VERSION_ID < 50300) {
+// Below PHP 5.3, clearstatcache does not accept any function parameters.
+clearstatcache();
+}
+else {
+clearstatcache(TRUE, $filepath);
+}
+// Zend OPcache.
+if (function_exists('opcache_invalidate')) {
+opcache_invalidate($filepath, TRUE);
+}
+// APC.
+if (function_exists('apc_delete_file')) {
+// apc_delete_file() throws a PHP warning in case the specified file was
+// not compiled yet.
+// @see http://php.net/apc-delete-file
+@apc_delete_file($filepath);
+}
+}

changeset 541	e756a8c72c3d
child 570	cdf0cb7bf073