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has_filter ›

Since2.5.0
Deprecatedn/a
has_filter ( $tag, $function_to_check = false )
Parameters: (2)
  • (string) $tag The name of the filter hook.
    Required: Yes
  • (callable|bool) $function_to_check Optional. The callback to check for. Default false.
    Required: No
    Default: false
Returns:
  • (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.
Defined at:
Codex:

Check if any filter has been registered for a hook.



Source

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 );
}