CI-3 HMVC PHP Error

I am trying to get CI-3 to work on localhost with PHP 8.3 and I am getting an error in the MX Controller:

A PHP Error was encountered
Severity: 8192

Message: str_replace(): Passing null to parameter #1 ($search) of type array|string is deprecated

Filename: MX/Controller.php

Line Number: 45

Backtrace:

File: C:\wamp64\www\chichester-evening-as\application\third_party\MX\Controller.php
Line: 45
Function: str_replace

Line 45 is: $class = str_replace(CI::$APP->config->item('controller_suffix'), '', get_class($this));

Any ideas on a fix?

CI3 not supporred php8.3.

Simple CI 4 project for beginners codeigniter-expenses ( topic )

CI3 not supporred php8.3.

Not natively perhaps but I'm sure there is a fix.

Ci3 does not work with PHP  8.2 or later.
It is no longer maintained.

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

CI3 not supporred php8.3.

Not natively perhaps but I'm sure there is a fix.

The fix is Codeigniter 4.

CI3 not supporred php8.3.

Not natively perhaps but I'm sure there is a fix.

The fix is Codeigniter 4.

Well actually you are just plain wrong. I have CI 3.1.11 running perfectly on localhost with php 8.3 in one app. But I did this some time ago and I can't remember exactly what I did. There is definitely a fix but you are unaware of it and I will have to look elsewhere to jog my memory.

CI3 not supporred php8