Vulcan is our brand-new mock testing system that enables you to verify your readiness for the new Zend PHP 5 Certification Exam.

Based entirely online, Vulcan gives you a quick, easy and effective way of testing your knowledge on the topics that count for the real exam.

They mention some of the features the testing has, including the same types of topics/question distribution/pass grade/etc and even gives you a breakdown of the topics you need to brush up on before the real exam. Best of all, it's only about $22.00 USD for a 10-credit pack (that's ten times to practice up on your skills and get as ready as possible for the exam).

If you're considering taking the exam, I'm not sure you could get a much better deal than this.