* {@link http://us2.php.net/manual/en/language.pseudo-types.php#language.types.callback 'callback'}
* type are valid.
*
- * Also see the {@link http://codex.wordpress.org/Plugin_API Plugin API} for
+ * Also see the {@link https://codex.wordpress.org/Plugin_API Plugin API} for
* more information and examples on how to use a lot of these functions.
*
* @package WordPress
* the opportunity to modify a value by returning a new value.
*
* The following example shows how a callback function is bound to a filter hook.
- * Note that $example is passed to the callback, (maybe) modified, then returned:
*
- * <code>
- * function example_callback( $example ) {
- * // Maybe modify $example in some way
- * return $example;
- * }
- * add_filter( 'example_filter', 'example_callback' );
- * </code>
+ * Note that `$example` is passed to the callback, (maybe) modified, then returned:
+ *
+ * function example_callback( $example ) {
+ * // Maybe modify $example in some way.
+ * return $example;
+ * }
+ * add_filter( 'example_filter', 'example_callback' );
*
* Since WordPress 1.5.1, bound callbacks can take as many arguments as are
- * passed as parameters in the corresponding apply_filters() call. The $accepted_args
+ * passed as parameters in the corresponding apply_filters() call. The `$accepted_args`
* parameter allows for calling functions only when the number of args match.
*
- * <strong>Note:</strong> the function will return true whether or not the callback
- * is valid. It is up to you to take care. This is done for optimization purposes,
+ * *Note:* the function will return true whether or not the callback is valid.
+ * It is up to you to take care. This is done for optimization purposes,
* so everything is as quick as possible.
*
* @since 0.71
* and functions with the same priority are executed
* in the order in which they were added to the action.
* @param int $accepted_args Optional. The number of arguments the function accepts. Default 1.
- * @return boolean true
+ * @return true
*/
function add_filter( $tag, $function_to_add, $priority = 10, $accepted_args = 1 ) {
global $wp_filter, $merged_filters;
*
* @param string $tag The name of the filter hook.
* @param callback|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.
+ * @return false|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
+ * $function_to_check argument, this function may return a non-boolean value
+ * that evaluates to false (e.g.) 0, so use the === operator for testing the
+ * return value.
*/
function has_filter($tag, $function_to_check = false) {
// Don't reset the internal array pointer
}
}
- if ( false === $function_to_check || false == $has )
+ if ( false === $function_to_check || false === $has )
return $has;
if ( !$idx = _wp_filter_build_unique_id($tag, $function_to_check, false) )
* the $tag parameter.
*
* The function allows for additional arguments to be added and passed to hooks.
- * <code>
- * // Our filter callback function
- * function example_callback( $string, $arg1, $arg2 ) {
- * // (maybe) modify $string
- * return $string;
- * }
- * add_filter( 'example_filter', 'example_callback', 10, 3 );
- *
- * // Apply the filters by calling the 'example_callback' function we
- * // "hooked" to 'example_filter' using the add_filter() function above.
- * // - 'example_filter' is the filter hook $tag
- * // - 'filter me' is the value being filtered
- * // - $arg1 and $arg2 are the additional arguments passed to the callback.
- * $value = apply_filters( 'example_filter', 'filter me', $arg1, $arg2 );
- * </code>
+ *
+ * // Our filter callback function
+ * function example_callback( $string, $arg1, $arg2 ) {
+ * // (maybe) modify $string
+ * return $string;
+ * }
+ * add_filter( 'example_filter', 'example_callback', 10, 3 );
+ *
+ * /*
+ * * Apply the filters by calling the 'example_callback' function we
+ * * "hooked" to 'example_filter' using the add_filter() function above.
+ * * - 'example_filter' is the filter hook $tag
+ * * - 'filter me' is the value being filtered
+ * * - $arg1 and $arg2 are the additional arguments passed to the callback.
+ * $value = apply_filters( 'example_filter', 'filter me', $arg1, $arg2 );
*
* @since 0.71
*
* @global array $wp_current_filter Stores the list of current filters with the current one last.
*
* @param string $tag The name of the filter hook.
- * @param mixed $value The value on which the filters hooked to <tt>$tag</tt> are applied on.
- * @param mixed $var Additional variables passed to the functions hooked to <tt>$tag</tt>.
+ * @param mixed $value The value on which the filters hooked to `$tag` are applied on.
+ * @param mixed $var Additional variables passed to the functions hooked to `$tag`.
* @return mixed The filtered value after all hooked functions are applied to it.
*/
function apply_filters( $tag, $value ) {
/**
* Execute functions hooked on a specific filter hook, specifying arguments in an array.
*
- * @see apply_filters() This function is identical, but the arguments passed to the
- * functions hooked to <tt>$tag</tt> are supplied using an array.
+ * @see 3.0.0
*
- * @since 3.0.0
+ * @see apply_filters() This function is identical, but the arguments passed to the
+ * functions hooked to `$tag` are supplied using an array.
*
* @global array $wp_filter Stores all of the filters
* @global array $merged_filters Merges the filter hooks using this function.
*
* @since 1.2.0
*
+ * @global array $wp_filter Stores all of the filters
+ * @global array $merged_filters Merges the filter hooks using this function.
+ *
* @param string $tag The filter hook to which the function to be removed is hooked.
* @param callback $function_to_remove The name of the function which should be removed.
* @param int $priority Optional. The priority of the function. Default 10.
- * @return boolean Whether the function existed before it was removed.
+ * @return bool Whether the function existed before it was removed.
*/
function remove_filter( $tag, $function_to_remove, $priority = 10 ) {
$function_to_remove = _wp_filter_build_unique_id( $tag, $function_to_remove, $priority );
*
* @since 2.7.0
*
+ * @global array $wp_filter Stores all of the filters
+ * @global array $merged_filters Merges the filter hooks using this function.
+ *
* @param string $tag The filter to remove hooks from.
* @param int|bool $priority Optional. The priority number to remove. Default false.
- * @return bool True when finished.
+ * @return true True when finished.
*/
function remove_all_filters( $tag, $priority = false ) {
global $wp_filter, $merged_filters;
if ( isset( $wp_filter[ $tag ]) ) {
- if ( false !== $priority && isset( $wp_filter[ $tag ][ $priority ] ) ) {
- $wp_filter[ $tag ][ $priority ] = array();
- } else {
+ if ( false === $priority ) {
$wp_filter[ $tag ] = array();
+ } elseif ( isset( $wp_filter[ $tag ][ $priority ] ) ) {
+ $wp_filter[ $tag ][ $priority ] = array();
}
}
- if ( isset( $merged_filters[ $tag ] ) ) {
- unset( $merged_filters[ $tag ] );
- }
+ unset( $merged_filters[ $tag ] );
return true;
}
*
* @since 2.5.0
*
+ * @global array $wp_current_filter Stores the list of current filters with the current one last
+ *
* @return string Hook name of the current filter or action.
*/
function current_filter() {
*
* @since 3.9.0
*
- * @uses current_filter()
- *
* @return string Hook name of the current action.
*/
function current_action() {
*
* @since 3.9.0
*
- * @uses doing_filter()
- *
* @param string|null $action Optional. Action to check. Defaults to null, which checks
* if any action is currently being run.
* @return bool Whether the action is currently in the stack.
*
* @since 1.2.0
*
- * @uses add_filter() Adds an action. Parameter list and functionality are the same.
- *
* @param string $tag The name of the action to which the $function_to_add is hooked.
* @param callback $function_to_add The name of the function you wish to be called.
* @param int $priority Optional. Used to specify the order in which the functions
* Lower numbers correspond with earlier execution,
* and functions with the same priority are executed
* in the order in which they were added to the action.
- * @param int $accepted_args Optional. The number of arguments the function accept. Default 1.
- * @return bool Will always return true.
+ * @param int $accepted_args Optional. The number of arguments the function accepts. Default 1.
+ * @return true Will always return true.
*/
function add_action($tag, $function_to_add, $priority = 10, $accepted_args = 1) {
return add_filter($tag, $function_to_add, $priority, $accepted_args);
/**
* Execute functions hooked on a specific action hook.
*
- * This function invokes all functions attached to action hook $tag. It is
+ * This function invokes all functions attached to action hook `$tag`. It is
* possible to create new action hooks by simply calling this function,
- * specifying the name of the new hook using the <tt>$tag</tt> parameter.
+ * specifying the name of the new hook using the `$tag` parameter.
*
* You can pass extra arguments to the hooks, much like you can with
- * apply_filters().
+ * {@see apply_filters()}.
*
* @since 1.2.0
*
- * @see apply_filters() This function works similar with the exception that nothing
- * is returned and only the functions or methods are called.
- * @global array $wp_filter Stores all of the filters
- * @global array $wp_actions Increments the amount of times action was triggered.
+ * @global array $wp_filter Stores all of the filters
+ * @global array $wp_actions Increments the amount of times action was triggered.
+ * @global array $merged_filters Merges the filter hooks using this function.
+ * @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 mixed $arg Optional. Additional arguments which are passed on to the
* functions hooked to the action. Default empty.
- * @return null Will return null if $tag does not exist in $wp_filter array.
*/
function do_action($tag, $arg = '') {
global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter;
$args[] =& $arg[0];
else
$args[] = $arg;
- for ( $a = 2; $a < func_num_args(); $a++ )
+ for ( $a = 2, $num = func_num_args(); $a < $num; $a++ )
$args[] = func_get_arg($a);
// Sort
*
* @see do_action() This function is identical, but the arguments passed to the
* 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_filter Stores all of the filters
+ * @global array $wp_actions Increments the amount of times action was triggered.
+ * @global array $merged_filters Merges the filter hooks using this function.
+ * @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 $args The arguments supplied to the functions hooked to <tt>$tag</tt>
- * @return null Will return null if $tag does not exist in $wp_filter array
+ * @param array $args The arguments supplied to the functions hooked to `$tag`.
*/
function do_action_ref_array($tag, $args) {
global $wp_filter, $wp_actions, $merged_filters, $wp_current_filter;
* @param string $tag The action hook to which the function to be removed is hooked.
* @param callback $function_to_remove The name of the function which should be removed.
* @param int $priority Optional. The priority of the function. Default 10.
- * @return boolean Whether the function is removed.
+ * @return bool Whether the function is removed.
*/
function remove_action( $tag, $function_to_remove, $priority = 10 ) {
return remove_filter( $tag, $function_to_remove, $priority );
*
* @param string $tag The action to remove hooks from.
* @param int|bool $priority The priority number to remove them from. Default false.
- * @return bool True when finished.
+ * @return true True when finished.
*/
function remove_all_actions($tag, $priority = false) {
return remove_all_filters($tag, $priority);
*
* @since 1.5.0
*
- * @uses WP_PLUGIN_DIR, WPMU_PLUGIN_DIR
+ * @global array $wp_plugin_paths
*
* @param string $file The filename of plugin.
* @return string The name of a plugin.
*
* @see plugin_basename()
*
+ * @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.
*/
global $wp_plugin_paths;
// Normalize, but store as static to avoid recalculation of a constant value
- static $wp_plugin_path, $wpmu_plugin_path;
+ 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 );
* @since 2.5.0
* @access private
*
- * @uses $wp_filter Used to process all of the functions in the 'all' hook.
+ * @global array $wp_filter Stores all of the filters
*
* @param array $args The collected parameters from the hook that was called.
*/
* 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 an a new property in
+ * 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.
*
* Functions and static method callbacks are just returned as strings and
* shouldn't have any speed penalty.
*
- * @link http://trac.wordpress.org/ticket/3875
+ * @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 callback $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|bool 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.
+ * @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;
return $obj_idx;
}
- } else if ( is_string($function[0]) ) {
+ } elseif ( is_string( $function[0] ) ) {
// Static Calling
return $function[0] . '::' . $function[1];
}
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