GC_Hook::has_filter()

最后更新于：2021-11-27 21:19:11

Checks if a specific callback has been registered for this hook.

参数

$hook_name

(string) (Optional) The name of the filter hook.

Default value: ”

$callback

(callable|false) (Optional) The callback to check for.

Default value: false

响应

(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.

源文件

文件: gc-includes/class-gc-hook.php

	public function has_filter( $hook_name = '', $callback = false ) {
		if ( false === $callback ) {
			return $this->has_filters();
		}

		$function_key = _gc_filter_build_unique_id( $hook_name, $callback, false );

		if ( ! $function_key ) {
			return false;
		}

		foreach ( $this->callbacks as $priority => $callbacks ) {
			if ( isset( $callbacks[ $function_key ] ) ) {
				return $priority;
			}
		}

		return false;
	}