Site similar to Ruby Quiz, but for PHP?

Does anyone know of a quiz site similar to ruby quiz (开发者_JAVA技巧http://www.rubyquiz.com/), but for PHP?

I figure the best way to learn php is to actually work on a script, at the moment, I can't think of a script that I would need so I'm looking for some ideas, maybe something thats not too hard.

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Have a look at phpGolf - http://phpgolf.org/

Not only are there problems to solve, but it'll challenge you to do it in as few bytes as possible.