doing_action() WP 3.9.0

Retrieve the name of an action currently being processed.

No Hooks.

Return

true/false. Whether the action is currently in the stack.

Usage

doing_action( $action );

$action(string/null)

Action to check.
Default: null, which checks if any action is currently being run

Code of doing action: wp-includes/plugin.php ^{VER 5.0.3}

<?php
function doing_action( $action = null ) {
	return doing_filter( $action );
}