It is called PHP Dune. It is a sandbox for PHP that you can download and install in your computer. Without the need to install PHP, a server or an internet connection.

It is built on top of NativePHP. Which wraps the software with Electron, so it is available for Windows, Mac and Linux.

As for the code editor, it uses CodeMirror, so it has syntax highlighting as well.

I hope you like it.

This is the link to the site: https://phpdune.salmonjump.com/ And here it is the link to the repo: https://github.com/pabloFdz/PHPDune