if ( ! isset( $wp_filter['all'] ) ) {
$wp_current_filter[] = $hook_name;
} elseif ( is_array( $arg[0] ) && 1 === count( $arg[0] ) && isset( $arg[0][0] ) && is_object( $arg[0][0] ) ) {
// Backward compatibility for PHP4-style passing of `array( &$this )` as action `$arg`.
$wp_filter[ $hook_name ]->do_action( $arg );
array_pop( $wp_current_filter );
* Calls the callback functions that have been added to an action hook, specifying arguments in an array.
* @see do_action() This function is identical, but the arguments passed to the
* functions hooked to `$hook_name` are supplied using an array.
* @global WP_Hook[] $wp_filter Stores all of the filters and actions.
* @global int[] $wp_actions Stores the number of times each action was triggered.
* @global string[] $wp_current_filter Stores the list of current filters with the current one last.
* @param string $hook_name The name of the action to be executed.
* @param array $args The arguments supplied to the functions hooked to `$hook_name`.
function do_action_ref_array( $hook_name, $args ) {
global $wp_filter, $wp_actions, $wp_current_filter;
if ( ! isset( $wp_actions[ $hook_name ] ) ) {
$wp_actions[ $hook_name ] = 1;
++$wp_actions[ $hook_name ];
// Do 'all' actions first.
if ( isset( $wp_filter['all'] ) ) {
$wp_current_filter[] = $hook_name;
$all_args = func_get_args(); // phpcs:ignore PHPCompatibility.FunctionUse.ArgumentFunctionsReportCurrentValue.NeedsInspection
_wp_call_all_hook( $all_args );
if ( ! isset( $wp_filter[ $hook_name ] ) ) {
if ( isset( $wp_filter['all'] ) ) {
array_pop( $wp_current_filter );
if ( ! isset( $wp_filter['all'] ) ) {
$wp_current_filter[] = $hook_name;
$wp_filter[ $hook_name ]->do_action( $args );
array_pop( $wp_current_filter );
* Checks if any action has been registered for a hook.
* When using the `$callback` 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.
* @see has_filter() This function is an alias of has_filter().
* @param string $hook_name The name of the action hook.
* @param callable|string|array|false $callback Optional. The callback to check for.
* This function can be called unconditionally to speculatively check
* a callback that may or may not exist. Default false.
* @return bool|int If `$callback` 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.
function has_action( $hook_name, $callback = false ) {
return has_filter( $hook_name, $callback );
* Removes a callback function from an action hook.
* This can be used to remove default functions attached to a specific action
* hook and possibly replace them with a substitute.
* To remove a hook, the `$callback` and `$priority` arguments must match
* when the hook was added. This goes for both filters and actions. No warning
* will be given on removal failure.
* @param string $hook_name The action hook to which the function to be removed is hooked.
* @param callable|string|array $callback The name of the function which should be removed.
* This function can be called unconditionally to speculatively remove
* a callback that may or may not exist.
* @param int $priority Optional. The exact priority used when adding the original
* action callback. Default 10.
* @return bool Whether the function is removed.
function remove_action( $hook_name, $callback, $priority = 10 ) {
return remove_filter( $hook_name, $callback, $priority );
* Removes all of the callback functions from an action hook.
* @param string $hook_name The action to remove callbacks from.
* @param int|false $priority Optional. The priority number to remove them from.
* @return true Always returns true.
function remove_all_actions( $hook_name, $priority = false ) {
return remove_all_filters( $hook_name, $priority );
* Retrieves the name of the current action hook.
* @return string Hook name of the current action.
function current_action() {
* Returns whether or not an action hook is currently being processed.
* The function current_action() only returns the most recent action being executed.
* did_action() returns the number of times an action has been fired during
* This function allows detection for any action currently being executed
* (regardless of whether it's the most recent action to fire, in the case of
* hooks called from hook callbacks) to be verified.
* @param string|null $hook_name Optional. Action hook to check. Defaults to null,
* which checks if any action is currently being run.
* @return bool Whether the action is currently in the stack.
function doing_action( $hook_name = null ) {
return doing_filter( $hook_name );
* Retrieves the number of times an action has been fired during the current request.
* @global int[] $wp_actions Stores the number of times each action was triggered.
* @param string $hook_name The name of the action hook.
* @return int The number of times the action hook has been fired.
function did_action( $hook_name ) {
if ( ! isset( $wp_actions[ $hook_name ] ) ) {
return $wp_actions[ $hook_name ];
* Fires functions attached to a deprecated filter hook.
* When a filter hook is deprecated, the apply_filters() call is replaced with
* apply_filters_deprecated(), which triggers a deprecation notice and then fires
* the original filter hook.
* Note: the value and extra arguments passed to the original apply_filters() call
* must be passed here to `$args` as an array. For example:
* return apply_filters( 'wpdocs_filter', $value, $extra_arg );
* return apply_filters_deprecated( 'wpdocs_filter', array( $value, $extra_arg ), '4.9.0', 'wpdocs_new_filter' );
* @see _deprecated_hook()
* @param string $hook_name 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 empty.
* @param string $message Optional. A message regarding the change. Default empty.
* @return mixed The filtered value after all hooked functions are applied to it.
function apply_filters_deprecated( $hook_name, $args, $version, $replacement = '', $message = '' ) {
if ( ! has_filter( $hook_name ) ) {
_deprecated_hook( $hook_name, $version, $replacement, $message );
return apply_filters_ref_array( $hook_name, $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
* @see _deprecated_hook()
* @param string $hook_name 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. Default empty.
* @param string $message Optional. A message regarding the change. Default empty.
function do_action_deprecated( $hook_name, $args, $version, $replacement = '', $message = '' ) {
if ( ! has_action( $hook_name ) ) {
_deprecated_hook( $hook_name, $version, $replacement, $message );
do_action_ref_array( $hook_name, $args );
// Functions for handling plugins.
* Gets the basename of a plugin.
* This method extracts the name of a plugin from its filename.
* @global array $wp_plugin_paths
* @param string $file The filename of plugin.
* @return string The name of a plugin.
function plugin_basename( $file ) {
// $wp_plugin_paths contains normalized paths.
$file = wp_normalize_path( $file );
arsort( $wp_plugin_paths );
foreach ( $wp_plugin_paths as $dir => $realdir ) {
if ( str_starts_with( $file, $realdir ) ) {
$file = $dir . substr( $file, strlen( $realdir ) );
$plugin_dir = wp_normalize_path( WP_PLUGIN_DIR );
$mu_plugin_dir = wp_normalize_path( WPMU_PLUGIN_DIR );
// Get relative path from plugins directory.
$file = preg_replace( '#^' . preg_quote( $plugin_dir, '#' ) . '/|^' . preg_quote( $mu_plugin_dir, '#' ) . '/#', '', $file );
$file = trim( $file, '/' );
* Register a plugin's real path.
* This is used in plugin_basename() to resolve symlinked paths.
* @see wp_normalize_path()
* @global array $wp_plugin_paths
* @param string $file Known path to the file.
* @return bool Whether the path was able to be registered.
function wp_register_plugin_realpath( $file ) {
// 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 ) {
if ( $plugin_path !== $plugin_realpath ) {
$wp_plugin_paths[ $plugin_path ] = $plugin_realpath;
* Get the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in.
* @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.
* @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
* @param string $file The filename of the plugin including the path.
* @param callable $callback The function hooked to the 'activate_PLUGIN' action.
function register_activation_hook( $file, $callback ) {
$file = plugin_basename( $file );
add_action( 'activate_' . $file, $callback );
* Sets 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'.
* @param string $file The filename of the plugin including the path.
* @param callable $callback The function hooked to the 'deactivate_PLUGIN' action.
function register_deactivation_hook( $file, $callback ) {
$file = plugin_basename( $file );
add_action( 'deactivate_' . $file, $callback );
* Sets 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 uninstallation process. The plugin should not
* hinder the uninstallation 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 uninstallation process
* bypassing the uninstall hook. The plugin, when using the 'uninstall.php'
* should always check for the 'WP_UNINSTALL_PLUGIN' constant, before
* @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' );
* 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' );
$plugin_basename = plugin_basename( $file );
if ( ! isset( $uninstallable_plugins[ $plugin_basename ] ) || $uninstallable_plugins[ $plugin_basename ] !== $callback ) {
$uninstallable_plugins[ $plugin_basename ] = $callback;
update_option( 'uninstall_plugins', $uninstallable_plugins );
* Calls 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.
* @global WP_Hook[] $wp_filter Stores all of the filters and actions.
* @param array $args The collected parameters from the hook that was called.
function _wp_call_all_hook( $args ) {
$wp_filter['all']->do_all_hook( $args );
* Builds a unique string ID for a hook callback function.
* Functions and static method callbacks are just returned as strings and
* shouldn't have any speed penalty.
* @link https://core.trac.wordpress.org/ticket/3875
* @since 5.3.0 Removed workarounds for spl_object_hash().
* `$hook_name` and `$priority` are no longer used,
* and the function always returns a string.
* @param string $hook_name Unused. The name of the filter to build ID for.
* @param callable|string|array $callback The callback to generate ID for. The callback may
* @param int $priority Unused. The order in which the functions
* associated with a particular action are executed.
* @return string Unique function ID for usage as array key.
function _wp_filter_build_unique_id( $hook_name, $callback, $priority ) {
if ( is_string( $callback ) ) {
if ( is_object( $callback ) ) {
// Closures are currently implemented as objects.
$callback = array( $callback, '' );
$callback = (array) $callback;
It is recommended that you Edit text format, this type of Fix handles quite a lot in one request
