Mark van der Velden has posted the third part of his "PHP Quiz" series to test your mental muscles on various PHP-related questions.

Welcome to another part of the PHP Quiz series, again some interesting questions to crack your brain about. If you have some nice additions or questions, be sure to leave a comment. Enjoy part three!

Questions in this edition cover unset, form output, working with strings, references, globals and working with class inheritance. You can check out part one and part two for more brain teasing fun.