Clarification about MY_Controller and relative inheritances

I believe looking at what he posted this is missing in the constructor of MY_Controller

PHP Code:

parent::__construct(); 


Or maybe the whole constructor method is missing in the MY_Controller class

But, if MY_Controller does not mess with any CI_Controller properties (and it only has one - private static $instance; so there is nothing to mess with) then technically he does not need to explicitly call the base class constructor. PHP will do it anyway.