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has_filter ›

has_filter ( $tag, $function_to_check = false )
Parameters: (2)
  • (string) $tag The name of the filter hook.
    Required: Yes
  • (callable|false) $function_to_check Optional. The callback to check for. Default false.
    Required: No
    Default: false
  • (bool|int) If `$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.
Defined at:

Checks if any filter has been registered for a hook.

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 ) {
	global $wp_filter;

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

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