Codeigniter authentication before every controller and action

Question

I am writing a web application using codeigniter.
I want to authenticate the privilege of our users before they access the page.
Actually nearly all controller action except the log in page need to call the model and use

$this->Users->validate($username, $password)

I want to make it general for every controller. Do I need to inherit the controller class? How could i do that?

Answer 1

We have a project using Codeigniter and the way we are doing it :

When you have a new controller :

class xxxx extends MY_Controller { }

And Inside the MY_Controller class

function __construct() {
 // do your validations
}