Best way to have multiple parent controllers

[eluser]wiredesignz[/eluser]

Code:

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
* Blog Controller
*/
class Blog_Controller extends Controller
{
    function Blog_Controller() {
        parent::Controller();
    }
}

/**
* Admin Controller
*/
class Admin_Controller extends Controller
{    
    function Admin_Controller() {
        parent::Controller();
    }
}

/* End of file MY_Controller.php */
/* Location: ./application/libraries/MY_Controller.php */

Code:

<?php if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
* include Blog Controller class
*/
include_once 'Blog_controller'.EXT;

/**
* include Admin Controller class
*/
include_once 'Admin_controller'.EXT;

/* End of file MY_Controller.php */
/* Location: ./application/libraries/MY_Controller.php */