How to use the var_dump output directly from the controller?

class IndexController extends \Phalcon\Mvc\Controller
{
    public function indexAction()
    {
        $custom = "Custom variable";
        var_dump($custom);
    }
}

How to display the result not using the variables in the template?

P.S. The result of the Echo function is also suppressed. I understand that this is the wrong approach, but it is a quick way to debug the variables.