Is this just to promote PHP?

There's about no code at all in this repo :)

This is a typical source file: https://github.com/Usbac/wolff/blob/master/system/definition...

And this is the largest and apparently the only one having more than 3 LOC, aside from index.php with 7: https://github.com/Usbac/wolff/blob/master/system/utilities/...

Nevertheless i upvoted your submission, since if this is sincere, it really shows how easy it is with PHP to create an MVP.