sites for having fun with php

Question

are there any sites where we have to solve puzzles using php scripts? Similar to PythonChallenge?

I am aware of most of the programming challenge sites, idea is to find a site which helps to discover the strength and speciality of PHP Scripting the way PythonChallenge does by it's wiki's for each level.

Answer 1

http://projecteuler.net/ has programming and math challenges that can be attempted in any language.

Answer 2

http://projecteuler.net/

mostly math challenges, most can be done with php.

Answer 3

You can try code golf. It's about solving the tasks with the smallest program.