WordPress at a glance

has_filter() WP 1.0

Check if any filter has been registered for a hook.

  • Global. Array. $wp_filter Stores all of the filters.
Is the basis for: has_action()
✈ 1 time = 0.000043s = very fast | 50000 times = 0.91s = very fast PHP 7.0.2, WP 4.4.2

No Hooks.

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.

Usage

has_filter( $tag, $function_to_check );
$tag(string) (required)
The name of the filter hook.
$function_to_check(callable/true/false)
The callback to check for.
Default: false

Code of has_filter: wp-includes/plugin.php VER 4.9.8

<?php
function has_filter($tag, $function_to_check = false) {
	global $wp_filter;

	if ( ! isset( $wp_filter[ $tag ] ) ) {
		return false;
	}

	return $wp_filter[ $tag ]->has_filter( $tag, $function_to_check );
}

Related Functions

From tag: Filters (hooks)

More from category: Hooks (actions, filters)

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