An extension is a piece of code written in C or C++ which will be included into the PHP core when PHP starts. Normally, you have some more native functions available after including an extension. PHP ...

Basically, VW Phpunit is an extension for PHPUnit, a popular code debugging tool. PHP itself is an immensely popular programming language — most of Facebook's code is written in PHP, for example.

3] GNU Emacs. Next up, we have a cross-platform, open-source IDE for you to write and compile PHP codes on. GNU Emacs was first designed for a GNU-based OS, but now it supports Windows 10.