rails-like before_filter

[eluser]webthink[/eluser]
Perhaps it's because I'm not familiar with rails but what advantage do filters give you over something like the following?

Code:

<?
class Start extends Controller {

    function Start() {
        parent::Controller();
        $this->authorization();
    }
    
    function index(){
        //... the index ...
    }
    
    function authorization(){
        if(user_not_logged()){
            redirect('other_ctrl/login');
        }
    }
        
}

?>