External App Check if User Logged In

I have a complete separate PHP script that is not even under the SuiteCRM folder. What’s the easiest way for me to check if the user is currently logged into Suite.

I tried this and it didn’t work. Following that example just brings up the dashboard.

Also tried this:

if (!defined(‘sugarEntry’)) {
define(‘sugarEntry’, true);
}

chdir ("…/suitecrm");

require_once ‘include/entryPoint.php’;

global $current_user;

echo “cu = “.$current_user->user_name.”
”;

Empty even when logged in.