title: Laravel, call filter in filter
body: <p>how i can call filter in filter using laravel?</p>
  
  <p>i have this filter:</p>
  
  <pre><code>Route::filter('auth', function()
  {
      if (Auth::guest())
      {
          if (Request::ajax())
          {
              return Response::make('Unauthorized', 401);
          }
          else
          {
              return Redirect::guest('login');
          }
      }
  });
  </code></pre>
  
  <p>now i create another filter called admin and i want call auth filter in this:</p>
  
  <pre><code>Route::filter('admin', function(){
      #call auth filter
  
      #code    
  });
  </code></pre>
  
  <p>it's possible do that?</p>