As i mentioned earlier, I got the book after a long time. I have read two chapters by now. It is a great book, showing the hidden parts of PHP5. But there is a tremendous problem . no Practice tests are given in the book.Instead, There is an online Mock exam which is not suitable for everyone.
The Certification Study Guide for PHP4 had sample tests with a companion:
Zend PHP Certification Sample Exams.
I think Zend wanna spread digital World ;)