title: extend multiple core controllers in codeigniter
body: <p>I have <code>MY_Controller</code> in core that extends CI_Controller. That works fine. But, I want to create another core controller named <code>MY_Controller_2</code> for some reasons. Can I do this in codeigniter? If yes then what will be the changes in <code>config</code> file?</p>
  
  <p><strong>config.php</strong></p>
  
  <pre><code>$config['subclass_prefix'] = 'MY_';
  </code></pre>
  
  <p><strong>Directory Structure</strong></p>
  
  <pre><code>core/MY_Controller
  core/MY_Controller_2    &lt;-------- I want another controller too.
  </code></pre>
  
  <p><strong>MY_Controller</strong></p>
  
  <pre><code>class MY_Controller extends CI_Controller {
  function __construct()
  {
      parent::__construct();
  }
  
  .....
  </code></pre>
  
  <p>so, basically, some of the controller files, I want to extend  from <code>MY_Controller</code> and some from <code>MY_Controller_2</code>.</p>