has_action( string $hook_name, callable|string|array|false $callback = false )

Checks if any action has been registered for a hook.


Description

When using the $callback 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.

See also


Parameters

$hook_name

(Required) The name of the action hook.

$callback

(Optional) The callback to check for.<br> This function can be called unconditionally to speculatively check a callback that may or may not exist.

Default value: false


Return

(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.


Source

File: wp-includes/plugin.php

function has_action($tag, $function_to_check = false) {
	return has_filter($tag, $function_to_check);
}


Changelog

Changelog
Version Description
2.5.0 Introduced.