Today I took the W3Schools PHP/MySQL certification exam and passed with a 90%! The required score to pass was 75% so while I am fairly happy with the 90% I received I was shooting for 95% or higher. The test was mainly comprised of questions pertaining to the fundamentals of web application development with PHP and MySQL. It was about 60% PHP and about 40% MySQL which I found to be a nice mix. Obviously I can't divulge any specifics about the exam but it is fairly straight-forward with a few surprises thrown in. I highly recommend visiting the W3Schools pages and taking their practice exams before even thinking about the certification test. The certification test was significantly more difficult than the practice exams but still very manageable for anyone with a solid foundation in both PHP and MySQL.
*** Update: [2/11/2011]