Adding property in all Contrellers: MY_Controller vs BaseController

Good point, maybe I could even use

PHP Code:

$this->controller_url = config_item('base_url')  . static::class; 


in case I extend the controller, the late static binding would do the job and I wouldn't have to declare again in the extended class $this->controller_url = config_item('base_url')  . __CLASS__;  

I use $this->router->class to avoid the confusion that the inheritance chain might cause and eliminate the need to redeclare in extended classes.  
Using $this->router->class should also by-pass problems that custom routes might introduce.