functions hooked to $tag< are supplied using an array.
* @global array $wp_filter Stores all of the filters
* @global array $wp_actions Increments the amount of times action was triggered.
* @global array $wp_current_filter Stores the list of current filters with the current one last
*
* @param string $tag The name of the action to be executed.
* @param array $args The arguments supplied to the functions hooked to `$tag`.
*/
function do_action_ref_array($tag, $args) {
global $wp_filter, $wp_actions, $wp_current_filter;
if ( ! isset($wp_actions[$tag]) )
$wp_actions[$tag] = 1;
else
++$wp_actions[$tag];
// Do 'all' actions first
if ( isset($wp_filter['all']) ) {
$wp_current_filter[] = $tag;
$all_args = func_get_args();
_wp_call_all_hook($all_args);
}
if ( !isset($wp_filter[$tag]) ) {
if ( isset($wp_filter['all']) )
array_pop($wp_current_filter);
return;
}
if ( !isset($wp_filter['all']) )
$wp_current_filter[] = $tag;
$wp_filter[ $tag ]->do_action( $args );
array_pop($wp_current_filter);
}
/**
* Check if any action has been registered for a hook.
*
* @since 2.5.0
*
* @see has_filter() has_action() is an alias of has_filter().
*
* @param string $tag The name of the action hook.
* @param callable|bool $function_to_check Optional. The callback to check for. Default false.
* @return bool|int If $function_to_check is omitted, returns boolean for whether the hook has
* anything registered. When checking a specific function, the priority of that
* hook is returned, or false if the function is not attached. When using the
* $function_to_check argument, this function may return a non-boolean value
* that evaluates to false (e.g.) 0, so use the === operator for testing the
* return value.
*/
function has_action($tag, $function_to_check = false) {
return has_filter($tag, $function_to_check);
}
/**
* Removes a function from a specified action hook.
*
* This function removes a function attached to a specified action hook. This
* method can be used to remove default functions attached to a specific filter
* hook and possibly replace them with a substitute.
*
* @since 1.2.0
*
* @param string $tag The action hook to which the function to be removed is hooked.
* @param callable $function_to_remove The name of the function which should be removed.
* @param int $priority Optional. The priority of the function. Default 10.
* @return bool Whether the function is removed.
*/
function remove_action( $tag, $function_to_remove, $priority = 10 ) {
return remove_filter( $tag, $function_to_remove, $priority );
}
/**
* Remove all of the hooks from an action.
*
* @since 2.7.0
*
* @param string $tag The action to remove hooks from.
* @param int|bool $priority The priority number to remove them from. Default false.
* @return true True when finished.
*/
function remove_all_actions($tag, $priority = false) {
return remove_all_filters($tag, $priority);
}
/**
* Fires functions attached to a deprecated filter hook.
*
* When a filter hook is deprecated, the apply_filters() call is replaced with
* apply_filters_deprecated(), which triggers a deprecation notice and then fires
* the original filter hook.
*
* @since 4.6.0
*
* @see _deprecated_hook()
*
* @param string $tag The name of the filter hook.
* @param array $args Array of additional function arguments to be passed to apply_filters().
* @param string $version The version of WordPress that deprecated the hook.
* @param string $replacement Optional. The hook that should have been used. Default false.
* @param string $message Optional. A message regarding the change. Default null.
*/
function apply_filters_deprecated( $tag, $args, $version, $replacement = false, $message = null ) {
if ( ! has_filter( $tag ) ) {
return $args[0];
}
_deprecated_hook( $tag, $version, $replacement, $message );
return apply_filters_ref_array( $tag, $args );
}
/**
* Fires functions attached to a deprecated action hook.
*
* When an action hook is deprecated, the do_action() call is replaced with
* do_action_deprecated(), which triggers a deprecation notice and then fires
* the original hook.
*
* @since 4.6.0
*
* @see _deprecated_hook()
*
* @param string $tag The name of the action hook.
* @param array $args Array of additional function arguments to be passed to do_action().
* @param string $version The version of WordPress that deprecated the hook.
* @param string $replacement Optional. The hook that should have been used.
* @param string $message Optional. A message regarding the change.
*/
function do_action_deprecated( $tag, $args, $version, $replacement = false, $message = null ) {
if ( ! has_action( $tag ) ) {
return;
}
_deprecated_hook( $tag, $version, $replacement, $message );
do_action_ref_array( $tag, $args );
}
//
// Functions for handling plugins.
//
/**
* Gets the basename of a plugin.
*
* This method extracts the name of a plugin from its filename.
*
* @since 1.5.0
*
* @global array $wp_plugin_paths
*
* @param string $file The filename of plugin.
* @return string The name of a plugin.
*/
function plugin_basename( $file ) {
global $wp_plugin_paths;
// $wp_plugin_paths contains normalized paths.
$file = wp_normalize_path( $file );
arsort( $wp_plugin_paths );
foreach ( $wp_plugin_paths as $dir => $realdir ) {
if ( strpos( $file, $realdir ) === 0 ) {
$file = $dir . substr( $file, strlen( $realdir ) );
}
}
$plugin_dir = wp_normalize_path( WP_PLUGIN_DIR );
$mu_plugin_dir = wp_normalize_path( WPMU_PLUGIN_DIR );
$file = preg_replace('#^' . preg_quote($plugin_dir, '#') . '/|^' . preg_quote($mu_plugin_dir, '#') . '/#','',$file); // get relative path from plugins dir
$file = trim($file, '/');
return $file;
}
/**
* Register a plugin's real path.
*
* This is used in plugin_basename() to resolve symlinked paths.
*
* @since 3.9.0
*
* @see wp_normalize_path()
*
* @global array $wp_plugin_paths
*
* @staticvar string $wp_plugin_path
* @staticvar string $wpmu_plugin_path
*
* @param string $file Known path to the file.
* @return bool Whether the path was able to be registered.
*/
function wp_register_plugin_realpath( $file ) {
global $wp_plugin_paths;
// Normalize, but store as static to avoid recalculation of a constant value
static $wp_plugin_path = null, $wpmu_plugin_path = null;
if ( ! isset( $wp_plugin_path ) ) {
$wp_plugin_path = wp_normalize_path( WP_PLUGIN_DIR );
$wpmu_plugin_path = wp_normalize_path( WPMU_PLUGIN_DIR );
}
$plugin_path = wp_normalize_path( dirname( $file ) );
$plugin_realpath = wp_normalize_path( dirname( realpath( $file ) ) );
if ( $plugin_path === $wp_plugin_path || $plugin_path === $wpmu_plugin_path ) {
return false;
}
if ( $plugin_path !== $plugin_realpath ) {
$wp_plugin_paths[ $plugin_path ] = $plugin_realpath;
}
return true;
}
/**
* Get the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in.
*
* @since 2.8.0
*
* @param string $file The filename of the plugin (__FILE__).
* @return string the filesystem path of the directory that contains the plugin.
*/
function plugin_dir_path( $file ) {
return trailingslashit( dirname( $file ) );
}
/**
* Get the URL directory path (with trailing slash) for the plugin __FILE__ passed in.
*
* @since 2.8.0
*
* @param string $file The filename of the plugin (__FILE__).
* @return string the URL path of the directory that contains the plugin.
*/
function plugin_dir_url( $file ) {
return trailingslashit( plugins_url( '', $file ) );
}
/**
* Set the activation hook for a plugin.
*
* When a plugin is activated, the action 'activate_PLUGINNAME' hook is
* called. In the name of this hook, PLUGINNAME is replaced with the name
* of the plugin, including the optional subdirectory. For example, when the
* plugin is located in wp-content/plugins/sampleplugin/sample.php, then
* the name of this hook will become 'activate_sampleplugin/sample.php'.
*
* When the plugin consists of only one file and is (as by default) located at
* wp-content/plugins/sample.php the name of this hook will be
* 'activate_sample.php'.
*
* @since 2.0.0
*
* @param string $file The filename of the plugin including the path.
* @param callable $function The function hooked to the 'activate_PLUGIN' action.
*/
function register_activation_hook($file, $function) {
$file = plugin_basename($file);
add_action('activate_' . $file, $function);
}
/**
* Set the deactivation hook for a plugin.
*
* When a plugin is deactivated, the action 'deactivate_PLUGINNAME' hook is
* called. In the name of this hook, PLUGINNAME is replaced with the name
* of the plugin, including the optional subdirectory. For example, when the
* plugin is located in wp-content/plugins/sampleplugin/sample.php, then
* the name of this hook will become 'deactivate_sampleplugin/sample.php'.
*
* When the plugin consists of only one file and is (as by default) located at
* wp-content/plugins/sample.php the name of this hook will be
* 'deactivate_sample.php'.
*
* @since 2.0.0
*
* @param string $file The filename of the plugin including the path.
* @param callable $function The function hooked to the 'deactivate_PLUGIN' action.
*/
function register_deactivation_hook($file, $function) {
$file = plugin_basename($file);
add_action('deactivate_' . $file, $function);
}
/**
* Set the uninstallation hook for a plugin.
*
* Registers the uninstall hook that will be called when the user clicks on the
* uninstall link that calls for the plugin to uninstall itself. The link won't
* be active unless the plugin hooks into the action.
*
* The plugin should not run arbitrary code outside of functions, when
* registering the uninstall hook. In order to run using the hook, the plugin
* will have to be included, which means that any code laying outside of a
* function will be run during the uninstall process. The plugin should not
* hinder the uninstall process.
*
* If the plugin can not be written without running code within the plugin, then
* the plugin should create a file named 'uninstall.php' in the base plugin
* folder. This file will be called, if it exists, during the uninstall process
* bypassing the uninstall hook. The plugin, when using the 'uninstall.php'
* should always check for the 'WP_UNINSTALL_PLUGIN' constant, before
* executing.
*
* @since 2.7.0
*
* @param string $file Plugin file.
* @param callable $callback The callback to run when the hook is called. Must be
* a static method or function.
*/
function register_uninstall_hook( $file, $callback ) {
if ( is_array( $callback ) && is_object( $callback[0] ) ) {
_doing_it_wrong( __FUNCTION__, __( 'Only a static class method or function can be used in an uninstall hook.' ), '3.1.0' );
return;
}
/*
* The option should not be autoloaded, because it is not needed in most
* cases. Emphasis should be put on using the 'uninstall.php' way of
* uninstalling the plugin.
*/
$uninstallable_plugins = (array) get_option('uninstall_plugins');
$uninstallable_plugins[plugin_basename($file)] = $callback;
update_option('uninstall_plugins', $uninstallable_plugins);
}
/**
* Call the 'all' hook, which will process the functions hooked into it.
*
* The 'all' hook passes all of the arguments or parameters that were used for
* the hook, which this function was called for.
*
* This function is used internally for apply_filters(), do_action(), and
* do_action_ref_array() and is not meant to be used from outside those
* functions. This function does not check for the existence of the all hook, so
* it will fail unless the all hook exists prior to this function call.
*
* @since 2.5.0
* @access private
*
* @global array $wp_filter Stores all of the filters
*
* @param array $args The collected parameters from the hook that was called.
*/
function _wp_call_all_hook($args) {
global $wp_filter;
$wp_filter['all']->do_all_hook( $args );
}
/**
* Build Unique ID for storage and retrieval.
*
* The old way to serialize the callback caused issues and this function is the
* solution. It works by checking for objects and creating a new property in
* the class to keep track of the object and new objects of the same class that
* need to be added.
*
* It also allows for the removal of actions and filters for objects after they
* change class properties. It is possible to include the property $wp_filter_id
* in your class and set it to "null" or a number to bypass the workaround.
* However this will prevent you from adding new classes and any new classes
* will overwrite the previous hook by the same class.
*
* Functions and static method callbacks are just returned as strings and
* shouldn't have any speed penalty.
*
* @link https://core.trac.wordpress.org/ticket/3875
*
* @since 2.2.3
* @access private
*
* @global array $wp_filter Storage for all of the filters and actions.
* @staticvar int $filter_id_count
*
* @param string $tag Used in counting how many hooks were applied
* @param callable $function Used for creating unique id
* @param int|bool $priority Used in counting how many hooks were applied. If === false
* and $function is an object reference, we return the unique
* id only if it already has one, false otherwise.
* @return string|false Unique ID for usage as array key or false if $priority === false
* and $function is an object reference, and it does not already have
* a unique id.
*/
function _wp_filter_build_unique_id($tag, $function, $priority) {
global $wp_filter;
static $filter_id_count = 0;
if ( is_string($function) )
return $function;
if ( is_object($function) ) {
// Closures are currently implemented as objects
$function = array( $function, '' );
} else {
$function = (array) $function;
}
if (is_object($function[0]) ) {
// Object Class Calling
if ( function_exists('spl_object_hash') ) {
return spl_object_hash($function[0]) . $function[1];
} else {
$obj_idx = get_class($function[0]).$function[1];
if ( !isset($function[0]->wp_filter_id) ) {
if ( false === $priority )
return false;
$obj_idx .= isset($wp_filter[$tag][$priority]) ? count((array)$wp_filter[$tag][$priority]) : $filter_id_count;
$function[0]->wp_filter_id = $filter_id_count;
++$filter_id_count;
} else {
$obj_idx .= $function[0]->wp_filter_id;
}
return $obj_idx;
}
} elseif ( is_string( $function[0] ) ) {
// Static Calling
return $function[0] . '::' . $function[1];
}
}
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