Extending The Controller Class in CodeIgniter

I take it you have put your MY_Controller in /application/core, and set the prefix in the config.I would be careful about using index as a class name though. As a function/method in Codeigniter it has a dedicated behaviour.

If you then want to extend that controller you need to put the classes in the same file.

E.g. In /application core

/* start of php file */class MY_Controller extends CI_Controller {    public function __construct() {       parent::__construct();    }...}class another_controller extends MY_Controller {    public function __construct() {       parent::__construct();    }...}/* end of php file */

In /application/controllers

class foo extends MY_Controller {    public function __construct() {       parent::__construct();    }...}

or

class bar extends another_controller {    public function __construct() {       parent::__construct();    }...}

I found this page on Google because I had the same problem. I didn't like the answers listed here so I created my own solution.

1) Place your parent class in the core folder.

2) Place an include statement at the beginning of all classes that include the parent class.

So a typical controller might look like this:

<?phprequire_once APPPATH . 'core/Your_Base_Class.php';// must use require_once instead of include or you will get an error when loading 404 pagesclass NormalController extends Your_Base_Class{    public function __construct()    {        parent::__construct();        // authentication/permissions code, or whatever you want to put here    }    // your methods go here}

The reason I like this solution is, the whole point of creating a parent class is to cut down on code repetition. So I don't like the other answer that suggested copy/pasting the parent class into all of your controller classes.

It is possible with Codeigniter 3. Just including the parent file is enough.

require_once(APPPATH."controllers/MyParentController.php");class MyChildController extends MyParentController {...