Mark van der Velden has posted another PHP quiz you can used to test your knowledge of the language:

A short quiz this time, but that doesn't make it less fun. Do you know the answer to all of them? Get a cup of coffee and kill 10 minutes with round two... As always, think of the answer before you execute the code or look it up. You can find round one here.

This one has questions on arrays, ArrayAccess, references, operator precedence and nesting structures. There's no answer key, so you'll just have to test it out if you want to see the answer.