classes[$class]) || !include($CONFIG->classes[$class])) {
return false;
}
}
/**
* Register all files found in $dir as classes
* Need to be named MyClass.php
*
* @param string $dir The dir to look in
*
* @return void
* @since 1.8.0
*/
function elgg_register_classes($dir) {
$classes = elgg_get_file_list($dir, array(), array(), array('.php'));
foreach ($classes as $class) {
elgg_register_class(basename($class, '.php'), $class);
}
}
/**
* Register a classname to a file.
*
* @param string $class The name of the class
* @param string $location The location of the file
*
* @return true
* @since 1.8.0
*/
function elgg_register_class($class, $location) {
global $CONFIG;
if (!isset($CONFIG->classes)) {
$CONFIG->classes = array();
}
$CONFIG->classes[$class] = $location;
return true;
}
/**
* Register a php library.
*
* @param string $name The name of the library
* @param string $location The location of the file
*
* @return void
* @since 1.8.0
*/
function elgg_register_library($name, $location) {
global $CONFIG;
if (!isset($CONFIG->libraries)) {
$CONFIG->libraries = array();
}
$CONFIG->libraries[$name] = $location;
}
/**
* Load a php library.
*
* @param string $name The name of the library
*
* @return void
* @throws InvalidParameterException
* @since 1.8.0
*/
function elgg_load_library($name) {
global $CONFIG;
if (!isset($CONFIG->libraries)) {
$CONFIG->libraries = array();
}
if (!isset($CONFIG->libraries[$name])) {
$error = elgg_echo('InvalidParameterException:LibraryNotRegistered', array($name));
throw new InvalidParameterException($error);
}
if (!include_once($CONFIG->libraries[$name])) {
$error = elgg_echo('InvalidParameterException:LibraryNotFound', array(
$name,
$CONFIG->libraries[$name])
);
throw new InvalidParameterException($error);
}
}
/**
* Forward to $location.
*
* Sends a 'Location: $location' header and exists. If headers have
* already been sent, returns FALSE.
*
* @param string $location URL to forward to browser to. Can be path relative to the network's URL.
* @param string $reason Short explanation for why we're forwarding
*
* @return False False if headers have been sent. Terminates execution if forwarding.
*/
function forward($location = "", $reason = 'system') {
global $CONFIG;
if (!headers_sent()) {
if ($location === REFERER) {
$location = $_SERVER['HTTP_REFERER'];
}
$location = elgg_normalize_url($location);
// return new forward location or false to stop the forward or empty string to exit
$current_page = current_page_url();
$params = array('current_url' => $current_page, 'forward_url' => $location);
$location = elgg_trigger_plugin_hook('forward', $reason, $params, $location);
if ($location) {
header("Location: {$location}");
exit;
} else if ($location === '') {
exit;
}
} else {
throw new SecurityException(elgg_echo('SecurityException:ForwardFailedToRedirect'));
}
}
/**
* Register a JavaScript file for inclusion
*
* This function handles adding JavaScript to a web page. If multiple
* calls are made to register the same JavaScript file based on the $id
* variable, only the last file is included. This allows a plugin to add
* JavaScript from a view that may be called more than once. It also handles
* more than one plugin adding the same JavaScript.
*
* jQuery plugins often have filenames such as jquery.rating.js. A best practice
* is to base $name on the filename: "jquery.rating". It is recommended to not
* use version numbers in the name.
*
* The JavaScript files can be local to the server or remote (such as
* Google's CDN).
*
* @param string $name An identifier for the JavaScript library
* @param string $url URL of the JavaScript file
* @param string $location Page location: head or footer. (default: head)
* @param int $priority Priority of the JS file (lower numbers load earlier)
*
* @return bool
* @since 1.8.0
*/
function elgg_register_js($name, $url, $location = 'head', $priority = null) {
return elgg_register_external_file('js', $name, $url, $location, $priority);
}
/**
* Unregister a JavaScript file
*
* @param string $name The identifier for the JavaScript library
*
* @return bool
* @since 1.8.0
*/
function elgg_unregister_js($name) {
return elgg_unregister_external_file('js', $name);
}
/**
* Load a JavaScript resource on this page
*
* This must be called before elgg_view_page(). It can be called before the
* script is registered. If you do not want a script loaded, unregister it.
*
* @param string $name Identifier of the JavaScript resource
*
* @return void
* @since 1.8.0
*/
function elgg_load_js($name) {
elgg_load_external_file('js', $name);
}
/**
* Get the JavaScript URLs that are loaded
*
* @param string $location 'head' or 'footer'
*
* @return array
* @since 1.8.0
*/
function elgg_get_loaded_js($location = 'head') {
return elgg_get_loaded_external_files('js', $location);
}
/**
* Register a CSS file for inclusion in the HTML head
*
* @param string $name An identifier for the CSS file
* @param string $url URL of the CSS file
* @param int $priority Priority of the CSS file (lower numbers load earlier)
*
* @return bool
* @since 1.8.0
*/
function elgg_register_css($name, $url, $priority = null) {
return elgg_register_external_file('css', $name, $url, 'head', $priority);
}
/**
* Unregister a CSS file
*
* @param string $name The identifier for the CSS file
*
* @return bool
* @since 1.8.0
*/
function elgg_unregister_css($name) {
return elgg_unregister_external_file('css', $name);
}
/**
* Load a CSS file for this page
*
* This must be called before elgg_view_page(). It can be called before the
* CSS file is registered. If you do not want a CSS file loaded, unregister it.
*
* @param string $name Identifier of the CSS file
*
* @return void
* @since 1.8.0
*/
function elgg_load_css($name) {
elgg_load_external_file('css', $name);
}
/**
* Get the loaded CSS URLs
*
* @return array
* @since 1.8.0
*/
function elgg_get_loaded_css() {
return elgg_get_loaded_external_files('css', 'head');
}
/**
* Core registration function for external files
*
* @param string $type Type of external resource (js or css)
* @param string $name Identifier used as key
* @param string $url URL
* @param string $location Location in the page to include the file
* @param int $priority Loading priority of the file
*
* @return bool
* @since 1.8.0
*/
function elgg_register_external_file($type, $name, $url, $location, $priority = 500) {
global $CONFIG;
if (empty($name) || empty($url)) {
return false;
}
$url = elgg_format_url($url);
$url = elgg_normalize_url($url);
elgg_bootstrap_externals_data_structure($type);
$name = trim(strtolower($name));
// normalize bogus priorities, but allow empty, null, and false to be defaults.
if (!is_numeric($priority)) {
$priority = 500;
}
// no negative priorities right now.
$priority = max((int)$priority, 0);
$item = elgg_extract($name, $CONFIG->externals_map[$type]);
if ($item) {
// updating a registered item
// don't update loaded because it could already be set
$item->url = $url;
$item->location = $location;
// if loaded before registered, that means it hasn't been added to the list yet
if ($CONFIG->externals[$type]->contains($item)) {
$priority = $CONFIG->externals[$type]->move($item, $priority);
} else {
$priority = $CONFIG->externals[$type]->add($item, $priority);
}
} else {
$item = new stdClass();
$item->loaded = false;
$item->url = $url;
$item->location = $location;
$priority = $CONFIG->externals[$type]->add($item, $priority);
}
$CONFIG->externals_map[$type][$name] = $item;
return $priority !== false;
}
/**
* Unregister an external file
*
* @param string $type Type of file: js or css
* @param string $name The identifier of the file
*
* @return bool
* @since 1.8.0
*/
function elgg_unregister_external_file($type, $name) {
global $CONFIG;
elgg_bootstrap_externals_data_structure($type);
$name = trim(strtolower($name));
$item = elgg_extract($name, $CONFIG->externals_map[$type]);
if ($item) {
unset($CONFIG->externals_map[$type][$name]);
return $CONFIG->externals[$type]->remove($item);
}
return false;
}
/**
* Load an external resource for use on this page
*
* @param string $type Type of file: js or css
* @param string $name The identifier for the file
*
* @return void
* @since 1.8.0
*/
function elgg_load_external_file($type, $name) {
global $CONFIG;
elgg_bootstrap_externals_data_structure($type);
$name = trim(strtolower($name));
$item = elgg_extract($name, $CONFIG->externals_map[$type]);
if ($item) {
// update a registered item
$item->loaded = true;
} else {
$item = new stdClass();
$item->loaded = true;
$item->url = '';
$item->location = '';
$priority = $CONFIG->externals[$type]->add($item);
$CONFIG->externals_map[$type][$name] = $item;
}
}
/**
* Get external resource descriptors
*
* @param string $type Type of file: js or css
* @param string $location Page location
*
* @return array
* @since 1.8.0
*/
function elgg_get_loaded_external_files($type, $location) {
global $CONFIG;
if (isset($CONFIG->externals) && $CONFIG->externals[$type] instanceof ElggPriorityList) {
$items = $CONFIG->externals[$type]->getElements();
$callback = "return \$v->loaded == true && \$v->location == '$location';";
$items = array_filter($items, create_function('$v', $callback));
if ($items) {
array_walk($items, create_function('&$v,$k', '$v = $v->url;'));
}
return $items;
}
return array();
}
/**
* Bootstraps the externals data structure in $CONFIG.
*
* @param string $type The type of external, js or css.
* @access private
*/
function elgg_bootstrap_externals_data_structure($type) {
global $CONFIG;
if (!isset($CONFIG->externals)) {
$CONFIG->externals = array();
}
if (!isset($CONFIG->externals[$type]) || !$CONFIG->externals[$type] instanceof ElggPriorityList) {
$CONFIG->externals[$type] = new ElggPriorityList();
}
if (!isset($CONFIG->externals_map)) {
$CONFIG->externals_map = array();
}
if (!isset($CONFIG->externals_map[$type])) {
$CONFIG->externals_map[$type] = array();
}
}
/**
* Returns a list of files in $directory.
*
* Only returns files. Does not recurse into subdirs.
*
* @param string $directory Directory to look in
* @param array $exceptions Array of filenames to ignore
* @param array $list Array of files to append to
* @param mixed $extensions Array of extensions to allow, NULL for all. Use a dot: array('.php').
*
* @return array Filenames in $directory, in the form $directory/filename.
*/
function elgg_get_file_list($directory, $exceptions = array(), $list = array(),
$extensions = NULL) {
$directory = sanitise_filepath($directory);
if ($handle = opendir($directory)) {
while (($file = readdir($handle)) !== FALSE) {
if (!is_file($directory . $file) || in_array($file, $exceptions)) {
continue;
}
if (is_array($extensions)) {
if (in_array(strrchr($file, '.'), $extensions)) {
$list[] = $directory . $file;
}
} else {
$list[] = $directory . $file;
}
}
closedir($handle);
}
return $list;
}
/**
* Sanitise file paths ensuring that they begin and end with slashes etc.
*
* @param string $path The path
* @param bool $append_slash Add tailing slash
*
* @return string
*/
function sanitise_filepath($path, $append_slash = TRUE) {
// Convert to correct UNIX paths
$path = str_replace('\\', '/', $path);
$path = str_replace('../', '/', $path);
// replace // with / except when preceeded by :
$path = preg_replace("/([^:])\/\//", "$1/", $path);
// Sort trailing slash
$path = trim($path);
// rtrim defaults plus /
$path = rtrim($path, " \n\t\0\x0B/");
if ($append_slash) {
$path = $path . '/';
}
return $path;
}
/**
* Queues a message to be displayed.
*
* Messages will not be displayed immediately, but are stored in
* for later display, usually upon next page load.
*
* The method of displaying these messages differs depending upon plugins and
* viewtypes. The core default viewtype retrieves messages in
* {@link views/default/page/shells/default.php} and displays messages as
* javascript popups.
*
* @internal Messages are stored as strings in the $_SESSION['msg'][$register] array.
*
* @warning This function is used to both add to and clear the message
* stack. If $messages is null, $register will be returned and cleared.
* If $messages is null and $register is empty, all messages will be
* returned and removed.
*
* @important This function handles the standard {@link system_message()} ($register =
* 'messages') as well as {@link register_error()} messages ($register = 'errors').
*
* @param mixed $message Optionally, a single message or array of messages to add, (default: null)
* @param string $register Types of message: "error", "success" (default: success)
* @param bool $count Count the number of messages (default: false)
*
* @return true|false|array Either the array of messages, or a response regarding
* whether the message addition was successful.
* @todo Clean up. Separate registering messages and retrieving them.
*/
function system_messages($message = null, $register = "success", $count = false) {
if (!isset($_SESSION['msg'])) {
$_SESSION['msg'] = array();
}
if (!isset($_SESSION['msg'][$register]) && !empty($register)) {
$_SESSION['msg'][$register] = array();
}
if (!$count) {
if (!empty($message) && is_array($message)) {
$_SESSION['msg'][$register] = array_merge($_SESSION['msg'][$register], $message);
return true;
} else if (!empty($message) && is_string($message)) {
$_SESSION['msg'][$register][] = $message;
return true;
} else if (is_null($message)) {
if ($register != "") {
$returnarray = array();
$returnarray[$register] = $_SESSION['msg'][$register];
$_SESSION['msg'][$register] = array();
} else {
$returnarray = $_SESSION['msg'];
$_SESSION['msg'] = array();
}
return $returnarray;
}
} else {
if (!empty($register)) {
return sizeof($_SESSION['msg'][$register]);
} else {
$count = 0;
foreach ($_SESSION['msg'] as $register => $submessages) {
$count += sizeof($submessages);
}
return $count;
}
}
return false;
}
/**
* Counts the number of messages, either globally or in a particular register
*
* @param string $register Optionally, the register
*
* @return integer The number of messages
*/
function count_messages($register = "") {
return system_messages(null, $register, true);
}
/**
* Display a system message on next page load.
*
* @see system_messages()
*
* @param string|array $message Message or messages to add
*
* @return bool
*/
function system_message($message) {
return system_messages($message, "success");
}
/**
* Display an error on next page load.
*
* @see system_messages()
*
* @param string|array $error Error or errors to add
*
* @return bool
*/
function register_error($error) {
return system_messages($error, "error");
}
/**
* Register a callback as an Elgg event handler.
*
* Events are emitted by Elgg when certain actions occur. Plugins
* can respond to these events or halt them completely by registering a handler
* as a callback to an event. Multiple handlers can be registered for
* the same event and will be executed in order of $priority. Any handler
* returning false will halt the execution chain.
*
* This function is called with the event name, event type, and handler callback name.
* Setting the optional $priority allows plugin authors to specify when the
* callback should be run. Priorities for plugins should be 1-1000.
*
* The callback is passed 3 arguments when called: $event, $type, and optional $params.
*
* $event is the name of event being emitted.
* $type is the type of event or object concerned.
* $params is an optional parameter passed that can include a related object. See
* specific event documentation for details on which events pass what parameteres.
*
* @tip If a priority isn't specified it is determined by the order the handler was
* registered relative to the event and type. For plugins, this generally means
* the earlier the plugin is in the load order, the earlier the priorities are for
* any event handlers.
*
* @tip $event and $object_type can use the special keyword 'all'. Handler callbacks registered
* with $event = all will be called for all events of type $object_type. Similarly,
* callbacks registered with $object_type = all will be called for all events of type
* $event, regardless of $object_type. If $event and $object_type both are 'all', the
* handler callback will be called for all events.
*
* @tip Event handler callbacks are considered in the follow order:
* - Specific registration where 'all' isn't used.
* - Registration where 'all' is used for $event only.
* - Registration where 'all' is used for $type only.
* - Registration where 'all' is used for both.
*
* @warning If you use the 'all' keyword, you must have logic in the handler callback to
* test the passed parameters before taking an action.
*
* @tip When referring to events, the preferred syntax is "event, type".
*
* @internal Events are stored in $CONFIG->events as:
*
* $CONFIG->events[$event][$type][$priority] = $callback;
*
*
* @param string $event The event type
* @param string $object_type The object type
* @param string $callback The handler callback
* @param int $priority The priority - 0 is default, negative before, positive after
*
* @return bool
* @link http://docs.elgg.org/Tutorials/Plugins/Events
* @example events/basic.php Basic example of registering an event handler callback.
* @example events/advanced.php Advanced example of registering an event handler
* callback and halting execution.
* @example events/all.php Example of how to use the 'all' keyword.
*/
function elgg_register_event_handler($event, $object_type, $callback, $priority = 500) {
global $CONFIG;
if (empty($event) || empty($object_type)) {
return FALSE;
}
if (!isset($CONFIG->events)) {
$CONFIG->events = array();
}
if (!isset($CONFIG->events[$event])) {
$CONFIG->events[$event] = array();
}
if (!isset($CONFIG->events[$event][$object_type])) {
$CONFIG->events[$event][$object_type] = array();
}
if (!is_callable($callback)) {
return FALSE;
}
$priority = max((int) $priority, 0);
while (isset($CONFIG->events[$event][$object_type][$priority])) {
$priority++;
}
$CONFIG->events[$event][$object_type][$priority] = $callback;
ksort($CONFIG->events[$event][$object_type]);
return TRUE;
}
/**
* Unregisters a callback for an event.
*
* @param string $event The event type
* @param string $object_type The object type
* @param string $callback The callback
*
* @return void
* @since 1.7
*/
function elgg_unregister_event_handler($event, $object_type, $callback) {
global $CONFIG;
foreach ($CONFIG->events[$event][$object_type] as $key => $event_callback) {
if ($event_callback == $callback) {
unset($CONFIG->events[$event][$object_type][$key]);
}
}
}
/**
* Trigger an Elgg Event and run all handler callbacks registered to that event, type.
*
* This function runs all handlers registered to $event, $object_type or
* the special keyword 'all' for either or both.
*
* $event is usually a verb: create, update, delete, annotation.
*
* $object_type is usually a noun: object, group, user, annotation, relationship, metadata.
*
* $object is usually an Elgg* object assciated with the event.
*
* @warning Elgg events should only be triggered by core. Plugin authors should use
* {@link trigger_elgg_plugin_hook()} instead.
*
* @tip When referring to events, the preferred syntax is "event, type".
*
* @internal Only rarely should events be changed, added, or removed in core.
* When making changes to events, be sure to first create a ticket in trac.
*
* @internal @tip Think of $object_type as the primary namespace element, and
* $event as the secondary namespace.
*
* @param string $event The event type
* @param string $object_type The object type
* @param string $object The object involved in the event
*
* @return bool The result of running all handler callbacks.
* @link http://docs.elgg.org/Tutorials/Core/Events
* @internal @example events/emit.php Basic emitting of an Elgg event.
*/
function elgg_trigger_event($event, $object_type, $object = null) {
global $CONFIG;
$events = array();
if (isset($CONFIG->events[$event][$object_type])) {
$events[] = $CONFIG->events[$event][$object_type];
}
if (isset($CONFIG->events['all'][$object_type])) {
$events[] = $CONFIG->events['all'][$object_type];
}
if (isset($CONFIG->events[$event]['all'])) {
$events[] = $CONFIG->events[$event]['all'];
}
if (isset($CONFIG->events['all']['all'])) {
$events[] = $CONFIG->events['all']['all'];
}
$args = array($event, $object_type, $object);
foreach ($events as $callback_list) {
if (is_array($callback_list)) {
foreach ($callback_list as $callback) {
if (call_user_func_array($callback, $args) === FALSE) {
return FALSE;
}
}
}
}
return TRUE;
}
/**
* Register a callback as a plugin hook handler.
*
* Plugin hooks allow developers to losely couple plugins and features by
* repsonding to and emitting {@link elgg_trigger_plugin_hook()} customizable hooks.
* Handler callbacks can respond to the hook, change the details of the hook, or
* ignore it.
*
* Multiple handlers can be registered for a plugin hook, and each callback
* is called in order of priority. If the return value of a handler is not
* null, that value is passed to the next callback in the call stack. When all
* callbacks have been run, the final value is passed back to the caller
* via {@link elgg_trigger_plugin_hook()}.
*
* Similar to Elgg Events, plugin hook handler callbacks are registered by passing
* a hook, a type, and a priority.
*
* The callback is passed 4 arguments when called: $hook, $type, $value, and $params.
*
* - str $hook The name of the hook.
* - str $type The type of hook.
* - mixed $value The return value of the last handler or the default
* value if no other handlers have been called.
* - mixed $params An optional array of parameters. Used to provide additional
* information to plugins.
*
* @internal Plugin hooks are stored in $CONFIG->hooks as:
*
* $CONFIG->hooks[$hook][$type][$priority] = $callback;
*
*
* @tip Plugin hooks are similar to Elgg Events in that Elgg emits
* a plugin hook when certain actions occur, but a plugin hook allows you to alter the
* parameters, as well as halt execution.
*
* @tip If a priority isn't specified it is determined by the order the handler was
* registered relative to the event and type. For plugins, this generally means
* the earlier the plugin is in the load order, the earlier the priorities are for
* any event handlers.
*
* @tip Like Elgg Events, $hook and $type can use the special keyword 'all'.
* Handler callbacks registered with $hook = all will be called for all hooks
* of type $type. Similarly, handlers registered with $type = all will be
* called for all hooks of type $event, regardless of $object_type. If $hook
* and $type both are 'all', the handler will be called for all hooks.
*
* @tip Plugin hooks are sometimes used to gather lists from plugins. This is
* usually done by pushing elements into an array passed in $params. Be sure
* to append to and then return $value so you don't overwrite other plugin's
* values.
*
* @warning Unlike Elgg Events, a handler that returns false will NOT halt the
* execution chain.
*
* @param string $hook The name of the hook
* @param string $type The type of the hook
* @param callback $callback The name of a valid function or an array with object and method
* @param int $priority The priority - 500 is default, lower numbers called first
*
* @return bool
*
* @example hooks/register/basic.php Registering for a plugin hook and examining the variables.
* @example hooks/register/advanced.php Registering for a plugin hook and changing the params.
* @link http://docs.elgg.org/Tutorials/Plugins/Hooks
* @since 1.8.0
*/
function elgg_register_plugin_hook_handler($hook, $type, $callback, $priority = 500) {
global $CONFIG;
if (empty($hook) || empty($type)) {
return FALSE;
}
if (!isset($CONFIG->hooks)) {
$CONFIG->hooks = array();
}
if (!isset($CONFIG->hooks[$hook])) {
$CONFIG->hooks[$hook] = array();
}
if (!isset($CONFIG->hooks[$hook][$type])) {
$CONFIG->hooks[$hook][$type] = array();
}
if (!is_callable($callback)) {
return FALSE;
}
$priority = max((int) $priority, 0);
while (isset($CONFIG->hooks[$hook][$type][$priority])) {
$priority++;
}
$CONFIG->hooks[$hook][$type][$priority] = $callback;
ksort($CONFIG->hooks[$hook][$type]);
return TRUE;
}
/**
* Unregister a callback as a plugin hook.
*
* @param string $hook The name of the hook
* @param string $entity_type The name of the type of entity (eg "user", "object" etc)
* @param callback $callback The PHP callback to be removed
*
* @return void
* @since 1.8.0
*/
function elgg_unregister_plugin_hook_handler($hook, $entity_type, $callback) {
global $CONFIG;
foreach ($CONFIG->hooks[$hook][$entity_type] as $key => $hook_callback) {
if ($hook_callback == $callback) {
unset($CONFIG->hooks[$hook][$entity_type][$key]);
}
}
}
/**
* Trigger a Plugin Hook and run all handler callbacks registered to that hook:type.
*
* This function runs all handlers regsitered to $hook, $type or
* the special keyword 'all' for either or both.
*
* Use $params to send additional information to the handler callbacks.
*
* $returnvalue Is the initial value to pass to the handlers, which can
* then change it. It is useful to use $returnvalue to set defaults.
* If no handlers are registered, $returnvalue is immediately returned.
*
* $hook is usually a verb: import, get_views, output.
*
* $type is usually a noun: user, ecml, page.
*
* @tip Like Elgg Events, $hook and $type can use the special keyword 'all'.
* Handler callbacks registered with $hook = all will be called for all hooks
* of type $type. Similarly, handlers registered with $type = all will be
* called for all hooks of type $event, regardless of $object_type. If $hook
* and $type both are 'all', the handler will be called for all hooks.
*
* @internal The checks for $hook and/or $type not being equal to 'all' is to
* prevent a plugin hook being registered with an 'all' being called more than
* once if the trigger occurs with an 'all'. An example in core of this is in
* actions.php:
* elgg_trigger_plugin_hook('action_gatekeeper:permissions:check', 'all', ...)
*
* @see elgg_register_plugin_hook_handler()
*
* @param string $hook The name of the hook to trigger ("all" will
* trigger for all $types regardless of $hook value)
* @param string $type The type of the hook to trigger ("all" will
* trigger for all $hooks regardless of $type value)
* @param mixed $params Additional parameters to pass to the handlers
* @param mixed $returnvalue An initial return value
*
* @return mixed|null The return value of the last handler callback called
*
* @example hooks/trigger/basic.php Trigger a hook that determins if execution
* should continue.
* @example hooks/trigger/advanced.php Trigger a hook with a default value and use
* the results to populate a menu.
* @example hooks/basic.php Trigger and respond to a basic plugin hook.
* @link http://docs.elgg.org/Tutorials/Plugins/Hooks
*
* @since 1.8.0
*/
function elgg_trigger_plugin_hook($hook, $type, $params = null, $returnvalue = null) {
global $CONFIG;
$hooks = array();
if (isset($CONFIG->hooks[$hook][$type])) {
if ($hook != 'all' && $type != 'all') {
$hooks[] = $CONFIG->hooks[$hook][$type];
}
}
if (isset($CONFIG->hooks['all'][$type])) {
if ($type != 'all') {
$hooks[] = $CONFIG->hooks['all'][$type];
}
}
if (isset($CONFIG->hooks[$hook]['all'])) {
if ($hook != 'all') {
$hooks[] = $CONFIG->hooks[$hook]['all'];
}
}
if (isset($CONFIG->hooks['all']['all'])) {
$hooks[] = $CONFIG->hooks['all']['all'];
}
foreach ($hooks as $callback_list) {
if (is_array($callback_list)) {
foreach ($callback_list as $hookcallback) {
$args = array($hook, $type, $returnvalue, $params);
$temp_return_value = call_user_func_array($hookcallback, $args);
if (!is_null($temp_return_value)) {
$returnvalue = $temp_return_value;
}
}
}
}
return $returnvalue;
}
/**
* Intercepts, logs, and displays uncaught exceptions.
*
* @warning This function should never be called directly.
*
* @see http://www.php.net/set-exception-handler
*
* @param Exception $exception The exception being handled
*
* @return void
* @access private
*/
function _elgg_php_exception_handler($exception) {
error_log("*** FATAL EXCEPTION *** : " . $exception);
// Wipe any existing output buffer
ob_end_clean();
// make sure the error isn't cached
header("Cache-Control: no-cache, must-revalidate", true);
header('Expires: Fri, 05 Feb 1982 00:00:00 -0500', true);
// @note Do not send a 500 header because it is not a server error
try {
// we don't want the 'pagesetup', 'system' event to fire
global $CONFIG;
$CONFIG->pagesetupdone = true;
elgg_set_viewtype('failsafe');
$body = elgg_view("messages/exceptions/exception", array('object' => $exception));
echo elgg_view_page(elgg_echo('exception:title'), $body);
} catch (Exception $e) {
$timestamp = time();
$message = $e->getMessage();
echo "Fatal error in exception handler. Check log for Exception #$timestamp";
error_log("Exception #$timestamp : fatal error in exception handler : $message");
}
}
/**
* Intercepts catchable PHP errors.
*
* @warning This function should never be called directly.
*
* @internal
* For catchable fatal errors, throws an Exception with the error.
*
* For non-fatal errors, depending upon the debug settings, either
* log the error or ignore it.
*
* @see http://www.php.net/set-error-handler
*
* @param int $errno The level of the error raised
* @param string $errmsg The error message
* @param string $filename The filename the error was raised in
* @param int $linenum The line number the error was raised at
* @param array $vars An array that points to the active symbol table where error occurred
*
* @return true
* @access private
*/
function _elgg_php_error_handler($errno, $errmsg, $filename, $linenum, $vars) {
$error = date("Y-m-d H:i:s (T)") . ": \"$errmsg\" in file $filename (line $linenum)";
switch ($errno) {
case E_USER_ERROR:
error_log("PHP ERROR: $error");
register_error("ERROR: $error");
// Since this is a fatal error, we want to stop any further execution but do so gracefully.
throw new Exception($error);
break;
case E_WARNING :
case E_USER_WARNING :
error_log("PHP WARNING: $error");
break;
default:
global $CONFIG;
if (isset($CONFIG->debug) && $CONFIG->debug === 'NOTICE') {
error_log("PHP NOTICE: $error");
}
}
return true;
}
/**
* Display or log a message.
*
* If $level is >= to the debug setting in {@link $CONFIG->debug}, the
* message will be sent to {@link elgg_dump()}. Messages with lower
* priority than {@link $CONFIG->debug} are ignored.
*
* {@link elgg_dump()} outputs all levels but NOTICE to screen by default.
*
* @note No messages will be displayed unless debugging has been enabled.
*
* @param str $message User message
* @param str $level NOTICE | WARNING | ERROR | DEBUG
*
* @return bool
* @since 1.7.0
* @todo This is complicated and confusing. Using int constants for debug levels will
* make things easier.
*/
function elgg_log($message, $level = 'NOTICE') {
global $CONFIG;
// only log when debugging is enabled
if (isset($CONFIG->debug)) {
// debug to screen or log?
$to_screen = !($CONFIG->debug == 'NOTICE');
switch ($level) {
case 'ERROR':
// always report
elgg_dump("$level: $message", $to_screen, $level);
break;
case 'WARNING':
case 'DEBUG':
// report except if user wants only errors
if ($CONFIG->debug != 'ERROR') {
elgg_dump("$level: $message", $to_screen, $level);
}
break;
case 'NOTICE':
default:
// only report when lowest level is desired
if ($CONFIG->debug == 'NOTICE') {
elgg_dump("$level: $message", FALSE, $level);
}
break;
}
return TRUE;
}
return FALSE;
}
/**
* Logs or displays $value.
*
* If $to_screen is true, $value is displayed to screen. Else,
* it is handled by PHP's {@link error_log()} function.
*
* A {@elgg_plugin_hook debug log} is called. If a handler returns
* false, it will stop the default logging method.
*
* @param mixed $value The value
* @param bool $to_screen Display to screen?
* @param string $level The debug level
*
* @return void
* @since 1.7.0
*/
function elgg_dump($value, $to_screen = TRUE, $level = 'NOTICE') {
global $CONFIG;
// plugin can return false to stop the default logging method
$params = array(
'level' => $level,
'msg' => $value,
'to_screen' => $to_screen,
);
if (!elgg_trigger_plugin_hook('debug', 'log', $params, true)) {
return;
}
// Do not want to write to screen before page creation has started.
// This is not fool-proof but probably fixes 95% of the cases when logging
// results in data sent to the browser before the page is begun.
if (!isset($CONFIG->pagesetupdone)) {
$to_screen = FALSE;
}
if ($to_screen == TRUE) {
echo '';
print_r($value);
echo '
';
} else {
error_log(print_r($value, TRUE));
}
}
/**
* Sends a notice about deprecated use of a function, view, etc.
*
* This function either displays or logs the deprecation message,
* depending upon the deprecation policies in {@link CODING.txt}.
* Logged messages are sent with the level of 'WARNING'.
*
* A user-visual message will be displayed if $dep_version is greater
* than 1 minor releases lower than the current Elgg version, or at all
* lower than the current Elgg major version.
*
* @note This will always at least log a warning. Don't use to pre-deprecate things.
* This assumes we are releasing in order and deprecating according to policy.
*
* @see CODING.txt
*
* @param str $msg Message to log / display.
* @param str $dep_version Human-readable *release* version: 1.7, 1.8, ...
* @param int $backtrace_level How many levels back to display the backtrace. Useful if calling from
* functions that are called from other places (like elgg_view()). Set
* to -1 for a full backtrace.
*
* @return bool
* @since 1.7.0
*/
function elgg_deprecated_notice($msg, $dep_version, $backtrace_level = 1) {
// if it's a major release behind, visual and logged
// if it's a 1 minor release behind, visual and logged
// if it's for current minor release, logged.
// bugfixes don't matter because you're not deprecating between them, RIGHT?
if (!$dep_version) {
return FALSE;
}
$elgg_version = get_version(TRUE);
$elgg_version_arr = explode('.', $elgg_version);
$elgg_major_version = (int)$elgg_version_arr[0];
$elgg_minor_version = (int)$elgg_version_arr[1];
$dep_major_version = (int)$dep_version;
$dep_minor_version = 10 * ($dep_version - $dep_major_version);
$visual = FALSE;
if (($dep_major_version < $elgg_major_version) ||
($dep_minor_version < $elgg_minor_version)) {
$visual = TRUE;
}
$msg = "Deprecated in $dep_major_version.$dep_minor_version: $msg";
if ($visual) {
register_error($msg);
}
// Get a file and line number for the log. Never show this in the UI.
// Skip over the function that sent this notice and see who called the deprecated
// function itself.
$msg .= " Called from ";
$stack = array();
$backtrace = debug_backtrace();
// never show this call.
array_shift($backtrace);
$i = count($backtrace);
foreach ($backtrace as $trace) {
$stack[] = "[#$i] {$trace['file']}:{$trace['line']}";
$i--;
if ($backtrace_level > 0) {
if ($backtrace_level <= 1) {
break;
}
$backtrace_level--;
}
}
$msg .= implode("
-> ", $stack);
elgg_log($msg, 'WARNING');
return TRUE;
}
/**
* Returns the current page's complete URL.
*
* The current URL is assembled using the network's wwwroot and the request URI
* in $_SERVER as populated by the web server. This function will include
* any schemes, usernames and passwords, and ports.
*
* @return string The current page URL.
*/
function current_page_url() {
global $CONFIG;
$url = parse_url(elgg_get_site_url());
$page = $url['scheme'] . "://";
// user/pass
if ((isset($url['user'])) && ($url['user'])) {
$page .= $url['user'];
}
if ((isset($url['pass'])) && ($url['pass'])) {
$page .= ":" . $url['pass'];
}
if ((isset($url['user']) && $url['user']) ||
(isset($url['pass']) && $url['pass'])) {
$page .= "@";
}
$page .= $url['host'];
if ((isset($url['port'])) && ($url['port'])) {
$page .= ":" . $url['port'];
}
$page = trim($page, "/");
$page .= $_SERVER['REQUEST_URI'];
return $page;
}
/**
* Return the full URL of the current page.
*
* @return string The URL
* @todo Combine / replace with current_page_url()
*/
function full_url() {
$s = empty($_SERVER["HTTPS"]) ? '' : ($_SERVER["HTTPS"] == "on") ? "s" : "";
$protocol = substr(strtolower($_SERVER["SERVER_PROTOCOL"]), 0,
strpos(strtolower($_SERVER["SERVER_PROTOCOL"]), "/")) . $s;
$port = ($_SERVER["SERVER_PORT"] == "80" || $_SERVER["SERVER_PORT"] == "443") ?
"" : (":" . $_SERVER["SERVER_PORT"]);
// This is here to prevent XSS in poorly written browsers used by 80% of the population.
// {@trac [5813]}
$quotes = array('\'', '"');
$encoded = array('%27', '%22');
return $protocol . "://" . $_SERVER['SERVER_NAME'] . $port .
str_replace($quotes, $encoded, $_SERVER['REQUEST_URI']);
}
/**
* Builds a URL from the a parts array like one returned by {@link parse_url()}.
*
* @note If only partial information is passed, a partial URL will be returned.
*
* @param array $parts Associative array of URL components like parse_url() returns
* @param bool $html_encode HTML Encode the url?
*
* @return str Full URL
* @since 1.7.0
*/
function elgg_http_build_url(array $parts, $html_encode = TRUE) {
// build only what's given to us.
$scheme = isset($parts['scheme']) ? "{$parts['scheme']}://" : '';
$host = isset($parts['host']) ? "{$parts['host']}" : '';
$port = isset($parts['port']) ? ":{$parts['port']}" : '';
$path = isset($parts['path']) ? "{$parts['path']}" : '';
$query = isset($parts['query']) ? "?{$parts['query']}" : '';
$string = $scheme . $host . $port . $path . $query;
if ($html_encode) {
return elgg_format_url($string);
} else {
return $string;
}
}
/**
* Adds action tokens to URL
*
* As of 1.7.0 action tokens are required on all actions.
* Use this function to append action tokens to a URL's GET parameters.
* This will preserve any existing GET parameters.
*
* @note If you are using {@elgg_view input/form} you don't need to
* add tokens to the action. The form view automatically handles
* tokens.
*
* @param str $url Full action URL
* @param bool $html_encode HTML encode the url? (default: false)
*
* @return str URL with action tokens
* @since 1.7.0
* @link http://docs.elgg.org/Tutorials/Actions
*/
function elgg_add_action_tokens_to_url($url, $html_encode = FALSE) {
$components = parse_url(elgg_normalize_url($url));
if (isset($components['query'])) {
$query = elgg_parse_str($components['query']);
} else {
$query = array();
}
if (isset($query['__elgg_ts']) && isset($query['__elgg_token'])) {
return $url;
}
// append action tokens to the existing query
$query['__elgg_ts'] = time();
$query['__elgg_token'] = generate_action_token($query['__elgg_ts']);
$components['query'] = http_build_query($query);
// rebuild the full url
return elgg_http_build_url($components, $html_encode);
}
/**
* Removes an element from a URL's query string.
*
* @note You can send a partial URL string.
*
* @param string $url Full URL
* @param string $element The element to remove
*
* @return string The new URL with the query element removed.
* @since 1.7.0
*/
function elgg_http_remove_url_query_element($url, $element) {
$url_array = parse_url($url);
if (isset($url_array['query'])) {
$query = elgg_parse_str($url_array['query']);
} else {
// nothing to remove. Return original URL.
return $url;
}
if (array_key_exists($element, $query)) {
unset($query[$element]);
}
$url_array['query'] = http_build_query($query);
$string = elgg_http_build_url($url_array);
return $string;
}
/**
* Adds an element or elements to a URL's query string.
*
* @param str $url The URL
* @param array $elements Key/value pairs to add to the URL
*
* @return str The new URL with the query strings added
* @since 1.7.0
*/
function elgg_http_add_url_query_elements($url, array $elements) {
$url_array = parse_url($url);
if (isset($url_array['query'])) {
$query = elgg_parse_str($url_array['query']);
} else {
$query = array();
}
foreach ($elements as $k => $v) {
$query[$k] = $v;
}
$url_array['query'] = http_build_query($query);
$string = elgg_http_build_url($url_array, false);
return $string;
}
/**
* Test if two URLs are functionally identical.
*
* @tip If $ignore_params is used, neither the name nor its value will be considered when comparing.
*
* @tip The order of GET params doesn't matter.
*
* @param string $url1 First URL
* @param string $url2 Second URL
* @param array $ignore_params GET params to ignore in the comparison
*
* @return bool
* @since 1.8.0
*/
function elgg_http_url_is_identical($url1, $url2, $ignore_params = array('offset', 'limit')) {
global $CONFIG;
// if the server portion is missing but it starts with / then add the url in.
// @todo use elgg_normalize_url()
if (elgg_substr($url1, 0, 1) == '/') {
$url1 = elgg_get_site_url() . ltrim($url1, '/');
}
if (elgg_substr($url1, 0, 1) == '/') {
$url2 = elgg_get_site_url() . ltrim($url2, '/');
}
// @todo - should probably do something with relative URLs
if ($url1 == $url2) {
return TRUE;
}
$url1_info = parse_url($url1);
$url2_info = parse_url($url2);
if (isset($url1_info['path'])) {
$url1_info['path'] = trim($url1_info['path'], '/');
}
if (isset($url2_info['path'])) {
$url2_info['path'] = trim($url2_info['path'], '/');
}
// compare basic bits
$parts = array('scheme', 'host', 'path');
foreach ($parts as $part) {
if ((isset($url1_info[$part]) && isset($url2_info[$part]))
&& $url1_info[$part] != $url2_info[$part]) {
return FALSE;
} elseif (isset($url1_info[$part]) && !isset($url2_info[$part])) {
return FALSE;
} elseif (!isset($url1_info[$part]) && isset($url2_info[$part])) {
return FALSE;
}
}
// quick compare of get params
if (isset($url1_info['query']) && isset($url2_info['query'])
&& $url1_info['query'] == $url2_info['query']) {
return TRUE;
}
// compare get params that might be out of order
$url1_params = array();
$url2_params = array();
if (isset($url1_info['query'])) {
if ($url1_info['query'] = html_entity_decode($url1_info['query'])) {
$url1_params = elgg_parse_str($url1_info['query']);
}
}
if (isset($url2_info['query'])) {
if ($url2_info['query'] = html_entity_decode($url2_info['query'])) {
$url2_params = elgg_parse_str($url2_info['query']);
}
}
// drop ignored params
foreach ($ignore_params as $param) {
if (isset($url1_params[$param])) {
unset($url1_params[$param]);
}
if (isset($url2_params[$param])) {
unset($url2_params[$param]);
}
}
// array_diff_assoc only returns the items in arr1 that aren't in arrN
// but not the items that ARE in arrN but NOT in arr1
// if arr1 is an empty array, this function will return 0 no matter what.
// since we only care if they're different and not how different,
// add the results together to get a non-zero (ie, different) result
$diff_count = count(array_diff_assoc($url1_params, $url2_params));
$diff_count += count(array_diff_assoc($url2_params, $url1_params));
if ($diff_count > 0) {
return FALSE;
}
return TRUE;
}
/**
* Checks for $array[$key] and returns its value if it exists, else
* returns $default.
*
* Shorthand for $value = (isset($array['key'])) ? $array['key'] : 'default';
*
* @param string $key The key to check.
* @param array $array The array to check against.
* @param mixed $default Default value to return if nothing is found.
* @param bool $strict Return array key if it's set, even if empty. If false,
* return $default if the array key is unset or empty.
*
* @return void
* @since 1.8.0
*/
function elgg_extract($key, array $array, $default = NULL, $strict = true) {
if ($strict) {
return (isset($array[$key])) ? $array[$key] : $default;
} else {
return (isset($array[$key]) && !empty($array[$key])) ? $array[$key] : $default;
}
}
/**
* Sorts a 3d array by specific element.
*
* @warning Will re-index numeric indexes.
*
* @note This operates the same as the built-in sort functions.
* It sorts the array and returns a bool for success.
*
* Do this: elgg_sort_3d_array_by_value($my_array);
* Not this: $my_array = elgg_sort_3d_array_by_value($my_array);
*
* @param array &$array Array to sort
* @param string $element Element to sort by
* @param int $sort_order PHP sort order
* {@see http://us2.php.net/array_multisort}
* @param int $sort_type PHP sort type
* {@see http://us2.php.net/sort}
*
* @return bool
*/
function elgg_sort_3d_array_by_value(&$array, $element, $sort_order = SORT_ASC,
$sort_type = SORT_LOCALE_STRING) {
$sort = array();
foreach ($array as $k => $v) {
if (isset($v[$element])) {
$sort[] = strtolower($v[$element]);
} else {
$sort[] = NULL;
}
};
return array_multisort($sort, $sort_order, $sort_type, $array);
}
/**
* Return the state of a php.ini setting as a bool
*
* @warning Using this on ini settings that are not boolean
* will be inaccurate!
*
* @param string $ini_get_arg The INI setting
*
* @return true|false Depending on whether it's on or off
*/
function ini_get_bool($ini_get_arg) {
$temp = strtolower(ini_get($ini_get_arg));
if ($temp == '1' || $temp == 'on' || $temp == 'true') {
return true;
}
return false;
}
/**
* Returns a PHP INI setting in bytes.
*
* @tip Use this for arithmetic when determining if a file can be uploaded.
*
* @param str $setting The php.ini setting
*
* @return int
* @since 1.7.0
* @link http://www.php.net/manual/en/function.ini-get.php
*/
function elgg_get_ini_setting_in_bytes($setting) {
// retrieve INI setting
$val = ini_get($setting);
// convert INI setting when shorthand notation is used
$last = strtolower($val[strlen($val) - 1]);
switch($last) {
case 'g':
$val *= 1024;
case 'm':
$val *= 1024;
case 'k':
$val *= 1024;
}
// return byte value
return $val;
}
/**
* Returns true is string is not empty, false, or null.
*
* Function to be used in array_filter which returns true if $string is not null.
*
* @param string $string The string to test
*
* @return bool
* @todo This is used once in metadata.php. Use a lambda function instead.
*/
function is_not_null($string) {
if (($string === '') || ($string === false) || ($string === null)) {
return false;
}
return true;
}
/**
* Normalise the singular keys in an options array to plural keys.
*
* Used in elgg_get_entities*() functions to support shortcutting plural
* names by singular names.
*
* @param array $options The options array. $options['keys'] = 'values';
* @param array $singulars A list of singular words to pluralize by adding 's'.
*
* @return array
* @since 1.7.0
* @access private
*/
function elgg_normalise_plural_options_array($options, $singulars) {
foreach ($singulars as $singular) {
$plural = $singular . 's';
if (array_key_exists($singular, $options)) {
if ($options[$singular] === ELGG_ENTITIES_ANY_VALUE) {
$options[$plural] = $options[$singular];
} else {
// Test for array refs #2641
if (!is_array($options[$singular])) {
$options[$plural] = array($options[$singular]);
} else {
$options[$plural] = $options[$singular];
}
}
}
unset($options[$singular]);
}
return $options;
}
/**
* Emits a shutdown:system event upon PHP shutdown, but before database connections are dropped.
*
* @tip Register for the shutdown:system event to perform functions at the end of page loads.
*
* @warning Using this event to perform long-running functions is not very
* useful. Servers will hold pages until processing is done before sending
* them out to the browser.
*
* @see http://www.php.net/register-shutdown-function
*
* @return void
* @see register_shutdown_hook()
* @access private
*/
function _elgg_shutdown_hook() {
global $START_MICROTIME;
try {
elgg_trigger_event('shutdown', 'system');
$time = (float)(microtime(TRUE) - $START_MICROTIME);
// demoted to NOTICE from DEBUG so javascript is not corrupted
elgg_log("Page {$_SERVER['REQUEST_URI']} generated in $time seconds", 'NOTICE');
} catch (Exception $e) {
$message = 'Error: ' . get_class($e) . ' thrown within the shutdown handler. ';
$message .= "Message: '{$e->getMessage()}' in file {$e->getFile()} (line {$e->getLine()})";
error_log($message);
error_log("Exception trace stack: {$e->getTraceAsString()}");
}
}
/**
* Serve javascript pages.
*
* Searches for views under js/ and outputs them with special
* headers for caching control.
*
* @param array $page The page array
*
* @return bool
* @elgg_pagehandler js
* @access private
*/
function elgg_js_page_handler($page) {
return elgg_cacheable_view_page_handler($page, 'js');
}
/**
* Serve individual views for Ajax.
*
* /ajax/view/?
*
* @param array $page The page array
*
* @return bool
* @elgg_pagehandler ajax
* @access private
*/
function elgg_ajax_page_handler($page) {
if (is_array($page) && sizeof($page)) {
// throw away 'view' and form the view name
unset($page[0]);
$view = implode('/', $page);
// pull out GET parameters through filter
$vars = array();
foreach ($_GET as $name => $value) {
$vars[$name] = get_input($name);
}
if (isset($vars['guid'])) {
$vars['entity'] = get_entity($vars['guid']);
}
echo elgg_view($view, $vars);
return true;
}
return false;
}
/**
* Serve CSS
*
* Serves CSS from the css views directory with headers for caching control
*
* @param array $page The page array
*
* @return void
* @elgg_pagehandler css
* @access private
*/
function elgg_css_page_handler($page) {
if (!isset($page[0])) {
// default css
$page[0] = 'elgg';
}
return elgg_cacheable_view_page_handler($page, 'css');
}
/**
* Serves a JS or CSS view with headers for caching.
*
* //name/of/view..
*
* @param array $page The page array
* @param string $type The type: js or css
*
* @return bool
* @access private
*/
function elgg_cacheable_view_page_handler($page, $type) {
switch ($type) {
case 'js':
$content_type = 'text/javascript';
break;
case 'css':
$content_type = 'text/css';
break;
default:
return false;
break;
}
if ($page) {
// the view file names can have multiple dots
// eg: views/default/js/calendars/jquery.fullcalendar.min.php
// translates to the url /js/calendars/jquery.fullcalendar.min..js
// and the view js/calendars/jquery.fullcalendar.min
// we ignore the last two dots for the ts and the ext.
// Additionally, the timestamp is optional.
$page = implode('/', $page);
$regex = '|(.+?)\.([\d]+\.)?\w+$|';
preg_match($regex, $page, $matches);
$view = $matches[1];
$return = elgg_view("$type/$view");
header("Content-type: $content_type");
// @todo should js be cached when simple cache turned off
//header('Expires: ' . date('r', time() + 864000));
//header("Pragma: public");
//header("Cache-Control: public");
//header("Content-Length: " . strlen($return));
echo $return;
return true;
}
}
/**
* Reverses the ordering in an ORDER BY clause. This is achived by replacing
* asc with desc, or appending desc to the end of the clause.
*
* This is used mostly for elgg_get_entities() and other similar functions.
*
* @param string $order_by An order by clause
* @access private
* @return string
* @access private
*/
function elgg_sql_reverse_order_by_clause($order_by) {
$order_by = strtolower($order_by);
if (strpos($order_by, ' asc') !== false) {
$return = str_replace(' asc', ' desc', $order_by);
} elseif (strpos($order_by, ' desc') !== false) {
$return = str_replace(' desc', ' asc', $order_by);
} else {
// no order specified, so default to desc since mysql defaults to asc
$return = $order_by . ' desc';
}
return $return;
}
/**
* Enable objects with an enable() method.
*
* Used as a callback for ElggBatch.
*
* @todo why aren't these static methods on ElggBatch?
*
* @param object $object The object to enable
* @return bool
* @access private
*/
function elgg_batch_enable_callback($object) {
// our db functions return the number of rows affected...
return $object->enable() ? true : false;
}
/**
* Disable objects with a disable() method.
*
* Used as a callback for ElggBatch.
*
* @param object $object The object to disable
* @return bool
* @access private
*/
function elgg_batch_disable_callback($object) {
// our db functions return the number of rows affected...
return $object->disable() ? true : false;
}
/**
* Delete objects with a delete() method.
*
* Used as a callback for ElggBatch.
*
* @param object $object The object to disable
* @return bool
* @access private
*/
function elgg_batch_delete_callback($object) {
// our db functions return the number of rows affected...
return $object->delete() ? true : false;
}
/**
* Checks if there are some constraints on the options array for
* potentially dangerous operations.
*
* @param array $options Options array
* @param string $type Options type: metadata or annotations
* @return bool
* @access private
*/
function elgg_is_valid_options_for_batch_operation($options, $type) {
if (!$options || !is_array($options)) {
return false;
}
// at least one of these is required.
$required = array(
// generic restraints
'guid', 'guids', 'limit'
);
switch ($type) {
case 'metadata':
$metadata_required = array(
'metadata_owner_guid', 'metadata_owner_guids',
'metadata_name', 'metadata_names',
'metadata_value', 'metadata_values'
);
$required = array_merge($required, $metadata_required);
break;
case 'annotations':
case 'annotation':
$annotations_required = array(
'annotation_owner_guid', 'annotation_owner_guids',
'annotation_name', 'annotation_names',
'annotation_value', 'annotation_values'
);
$required = array_merge($required, $annotations_required);
break;
default:
return false;
}
foreach ($required as $key) {
// check that it exists and is something.
if (isset($options[$key]) && $options[$key]) {
return true;
}
}
return false;
}
/**
* Intercepts the index page when Walled Garden mode is enabled.
*
* @link http://docs.elgg.org/Tutorials/WalledGarden
* @elgg_plugin_hook index system
* @return bool
* @access private
*/
function elgg_walled_garden_index() {
elgg_load_css('elgg.walled_garden');
elgg_load_js('elgg.walled_garden');
$body = elgg_view('core/walled_garden/body');
echo elgg_view_page('', $body, 'walled_garden');
// return true to prevent other plugins from adding a front page
return true;
}
/**
* Checks the status of the Walled Garden and forwards to a login page
* if required.
*
* If the site is in Walled Garden mode, all page except those registered as
* plugin pages by {@elgg_hook public_pages walled_garden} will redirect to
* a login page.
*
* @since 1.8.0
* @elgg_event_handler init system
* @link http://docs.elgg.org/Tutorials/WalledGarden
* @return void
* @access private
*/
function elgg_walled_garden() {
global $CONFIG;
elgg_register_css('elgg.walled_garden', '/css/walled_garden.css');
elgg_register_js('elgg.walled_garden', '/js/walled_garden.js');
// check for external page view
if (isset($CONFIG->site) && $CONFIG->site instanceof ElggSite) {
$CONFIG->site->checkWalledGarden();
}
}
/**
* Elgg's main init.
*
* Handles core actions for comments, the JS pagehandler, and the shutdown function.
*
* @elgg_event_handler init system
* @return void
* @access private
*/
function elgg_init() {
global $CONFIG;
elgg_register_action('comments/add');
elgg_register_action('comments/delete');
elgg_register_page_handler('js', 'elgg_js_page_handler');
elgg_register_page_handler('css', 'elgg_css_page_handler');
elgg_register_page_handler('ajax', 'elgg_ajax_page_handler');
elgg_register_js('elgg.autocomplete', 'js/lib/ui.autocomplete.js');
elgg_register_js('jquery.ui.autocomplete.html', 'vendors/jquery/jquery.ui.autocomplete.html.js');
elgg_register_js('elgg.userpicker', 'js/lib/ui.userpicker.js');
elgg_register_js('elgg.friendspicker', 'js/lib/ui.friends_picker.js');
elgg_register_js('jquery.easing', 'vendors/jquery/jquery.easing.1.3.packed.js');
elgg_register_js('elgg.avatar_cropper', 'js/lib/ui.avatar_cropper.js');
elgg_register_js('jquery.imgareaselect', 'vendors/jquery/jquery.imgareaselect-0.9.8/scripts/jquery.imgareaselect.min.js');
elgg_register_css('jquery.imgareaselect', 'vendors/jquery/jquery.imgareaselect-0.9.8/css/imgareaselect-deprecated.css');
// Trigger the shutdown:system event upon PHP shutdown.
register_shutdown_function('_elgg_shutdown_hook');
$logo_url = elgg_get_site_url() . "_graphics/elgg_toolbar_logo.gif";
elgg_register_menu_item('topbar', array(
'name' => 'elgg_logo',
'href' => 'http://www.elgg.org/',
'text' => "![\"Elgg](\"$logo_url\")
",
'priority' => 1,
'link_class' => 'elgg-topbar-logo',
));
// Sets a blacklist of words in the current language.
// This is a comma separated list in word:blacklist.
// @todo possibly deprecate
$CONFIG->wordblacklist = array();
$list = explode(',', elgg_echo('word:blacklist'));
if ($list) {
foreach ($list as $l) {
$CONFIG->wordblacklist[] = trim($l);
}
}
}
/**
* Adds unit tests for the general API.
*
* @param string $hook unit_test
* @param string $type system
* @param array $value array of test files
* @param array $params empty
*
* @elgg_plugin_hook unit_tests system
* @return void
* @access private
*/
function elgg_api_test($hook, $type, $value, $params) {
global $CONFIG;
$value[] = $CONFIG->path . 'engine/tests/api/entity_getter_functions.php';
$value[] = $CONFIG->path . 'engine/tests/api/helpers.php';
$value[] = $CONFIG->path . 'engine/tests/regression/trac_bugs.php';
return $value;
}
/**#@+
* Controlls access levels on ElggEntity entities, metadata, and annotations.
*
* @var int
*/
define('ACCESS_DEFAULT', -1);
define('ACCESS_PRIVATE', 0);
define('ACCESS_LOGGED_IN', 1);
define('ACCESS_PUBLIC', 2);
define('ACCESS_FRIENDS', -2);
/**#@-*/
/**
* Constant to request the value of a parameter be ignored in elgg_get_*() functions
*
* @see elgg_get_entities()
* @var NULL
* @since 1.7
*/
define('ELGG_ENTITIES_ANY_VALUE', NULL);
/**
* Constant to request the value of a parameter be nothing in elgg_get_*() functions.
*
* @see elgg_get_entities()
* @var int 0
* @since 1.7
*/
define('ELGG_ENTITIES_NO_VALUE', 0);
/**
* Used in calls to forward() to specify the browser should be redirected to the
* referring page.
*
* @see forward
* @var unknown_type
*/
define('REFERRER', -1);
/**
* Alternate spelling for REFERRER. Included because of some bad documentation
* in the original HTTP spec.
*
* @see forward()
* @link http://en.wikipedia.org/wiki/HTTP_referrer#Origin_of_the_term_referer
* @var int -1
*/
define('REFERER', -1);
elgg_register_event_handler('init', 'system', 'elgg_init');
elgg_register_plugin_hook_handler('unit_test', 'system', 'elgg_api_test');
elgg_register_event_handler('init', 'system', 'add_custom_menu_items', 1000);
elgg_register_event_handler('init', 'system', 'elgg_walled_garden', 1000);