Adding property in all Contrellers: MY_Controller vs BaseController

I would like each controller in my app to have a property called $controller_url that I would set to

$this->config->item('base_url') . $this->uri->segment(1);

In this way in each controller I will always have the controller url ready to be passed to views.



What's the best practice to do this?

Should I add an application/core/MY_Controller.php

Code:

class MY_Controller extends CI_Controller
{  
   protected $controller_url;
  
   function __construct() {
      parent::__construct();      
      $this->controller_url = config_item('base_url') . $this->uri->segment(1);      
   }

}

, or should I simply create a sort of base controller and extends all my controllers from that one i.e.

application/controllers/basecontroller.php

Code:

class BaseController extends CI_Controller
{  
   protected $controller_url;
  
   function __construct() {
      parent::__construct();
      $this->controller_url = config_item('base_url') . $this->uri->segment(1);      
   }

}

class Invoices extends BaseController
{  
   function __construct() {
      parent::__construct();
   }

   function listInvoices() {
      $vars['year'] = $year;
      $vars['controller_url'] = $this->controller_url;
      ...
      $this->load->view('invoices_v.htm', $vars);
}

What do you think?