Although I am certain that having a PHP certification is not the only way to demonstrate that a PHP developer is really qualified, I am sure that it helps hinting employers about his skills, and so become more open to negotiate better salaries. Having a PHP certification also helps a developer stand out from the crowd of developers that apply to a job but do not have any certification.

In the interview Manuel talks with Mauricio (a Brazilian PHP developer) about whether or not he feels the certification is worth it, how a developer can take it and what they need to do to prepare for it as well as a mention of a book that might help.

Michael Kimsal has also posted some of his own thoughts on the certification issue (and of the comments made during the interview).

Zend Certification is an important step for a PHP developer. It is a very good chance to evaluate your skills, show your experience to your co-workers and potential customers.

He points out Zend's resource for all things ZCE, using the ZCE Yellow Pages to find others in your area and the process he went through to prepare for and take the exam. Oh, and in case you're wondering - yes, he passed.