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

Checks if any action has been registered for a hook.

Description 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 See also

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Parameters Parameters


(string) (Required) The name of the action hook.


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

Default value: false

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Return 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.

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More Information More Information

Since this action is an alias of has_filter() , it also uses the global array $wp_filter that stores all of the filters / actions.

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Source Source

File: wp-includes/plugin.php

function has_action( $hook_name, $callback = false ) {
	return has_filter( $hook_name, $callback );

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Changelog Changelog

Version Description
2.5.0 Introduced.

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