Subclassing Controller

[eluser]taewoo[/eluser]
Is there a way to extend the "MY_Controller"?

Meaning this MY_Controller is an abstract class that cannot be extended... then two sub-classes of MY_Controller (say Uno_Controller and Dos_Controller) that actually does "stuff":

Example, in application/library/

Code:

abstract class MY_Controller extends Controller
{
   protected $var_1, $var_2;
   function __construct($var_1, $var_2)
   {
         $this->var_1 = $var_1;
         $this->var_2 = $var_2;

         $this->_authenticate();
   }

   abstract public function _authenticate();
}

then ALSO in library, there are two that extend this MY_Controller:

Code:

class Uno extends MY_Controller
{
   function __construct()
   {
         parent::__construct("Hello", "World");
   }

   public function _authenticate()
   {
         print_r($this->var_1);
         print_r($this->var_2);

   }
}

class Dos extends MY_Controller
{
   function __construct()
   {
         parent::__construct("Fart", "Burp");
   }

   public function _authenticate()
   {
         var_dump($this->var_1);
         var_dump($this->var_2);

   }
}

Then in the actual application/controller/XYZ.php, you extend either Dos or Uno.

I can't seem to get this to work.