Base Controller step by step created
Step 1 :- go to codeigniter folder and go to core folder
Step 2 :- go to core folder and created file name this(MY_controller.php)
step 3 :-
For Example this like
Note :Why CI_Controller extends beacuase CI_Controller beacuase CI_Controller features used    class MY_Controller extends CI_Controller
{
}
This used to all controller used not created __construct() write
CI_controller featcures used this class MY_Controller
CI_Controller inheritance  MY_Controller
step 4 :- go to application,Controller Welcome
class Welcome extends MY_Controller {
}
Note :MY_Controller inheritance CI_Controller
step 5 :- created admin.php controller and User controller created
Public Controller created this
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Admin Controller created this
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class User extends MY_Controller
{
}
and created user.php controller createdclass user extends MY_Controller
{
public function index()
{
echo  “public index”;
}
}