has_action() WP 1.0

Check if any action has been registered for a hook.

No Hooks.

Return

true/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_action( $tag, $function_to_check );

$tag(string) (required)

The name of the action hook.

$function_to_check(callable/true/false)

The callback to check for.
Default: false

Code of has action: wp-includes/plugin.php ^{WP 5.2.1}

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

Related Functions

From tag: Actions (hooks)

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