phpdbg

Author(s)
Felipe Pena, Joe Watkins, Bob Weinand
Website
https://www.php.net/manual/intro.phpdbg.php
License
The PHP License

phpdbg aims to be a lightweight, powerful, easy to use debugging platform for PHP.

Implemented as a SAPI module, it can exert complete control over the environment without impacting the functionality or performance of your code.