Do you think or do you know you mastered PHP?
A PHP syntax exam from BlueShoes is the exact thing you need to test yourself.
Try a teaser before you get into the real test:
$x = ("15" == 15)
What's the data type of $x?
You can find the answer by doing the real test. (yes... a paradox...)

To help you with the questions, BlueShoes have a PHP cheat sheet with few tables of empty(), is_null() functions and comparison results between different expressions. Trust me, you can't get everything right the first try.

What? too easy? want some other challenge? you got it.
A PHP contest for Zend studio is held on The Programming and Management Blog, test your skill there.
I wish you guys best luck on it on beating me, so I can get the No.2 spot and get the t-shirt in my dreams.

Sidetrack...

I'm RICH!!!