log out script

Hello, i have a log out script but it's not deleting the session here is the script:

<?php
		// Four steps to closing a session
		// (i.e. logging out)
 
		// 1. Find the session
		session_start();
		
		// 2. Unset all the session variables
		$_SESSION = array();
		
		// 3. Destroy the session cookie
		if(isset($_COOKIE[session_name()])) {
			setcookie(session_name(), '', time()-42000, '/');
		}
		
		// 4. Destroy the session
		session_destroy();
		
?>

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