Howto extend default controller

In your Controllers that extends MY_Controller:

PHP Code:

   public function __construct() 
    {
        parent::__construct(); // put it in first line in your controller

        //other codes

    } 


If child class has constructer method it overrides parent constructer method that means parent constructer will not run.
If child class does not have constructer method than parent constructer method will run.
If child class has constructer and you also want parent constructer to run your should put parent::__construct();
in constructer method of child class