Well, from today i am a proud Zend PHP 5 Certified Engineer. It was not easy though, even with the fact that i already worked with PHP for about 5 years ^^. But there was just some question i not familiar with, because i never use it in my daily work with PHP. Difference between PHP 4 and PHP 5 was asked but it is not so difficult to answer. But some of the PHP specific questions is really hard to answer, especially the questions related to stream functions ^^. The New Object Oriented Paradigm and Security issues was for me the easiest one.