How to extend the Controller core class

Showing code you tried and telling the actual error you received is the best way to get a good answer. That said - extending the Controller class is pretty simple - you're just extending a normal PHP class, no special MY_ prefixes needed or anything like that.

1. Make a new BaseController class/file. Make sure it is namespaced so the autoloader can find it.

PHP Code:

<?php namespace App\Controllers;

class BaseController extends \CodeIgniter\Controller 
{
    public function __construct(...$params)
    {
        parent::__construct(...$params);
    }
} 


2. Have all of your new controllers extend BaseController instead of CodeIgniter\Controller.

Note: you don't need to have the constructor shown here unless you need additional tasks in the constructor. I just showed it here to remind people about the parameter packing/un-packing available in PHP 7.

What is the proper way to extend the CI4 BaseController where the child class(es) will require a constructor? Very newbie question, but I'm under the impression that if there is an immediate child constructor, one must include...

   

Code:

parent::__construct(...$params);

...in the child's constructor. The "...$params" is the part I'm unsure about. The BaseController constructor (initController) has three params that are required. It's not obvious to me what to include as the params.