There is a PHP certification available through http://www.brainbench.com Brainbench.com is a pretty/very reputable website for certifications. There are certifications for HTML, WYSIWYG editors, programming languages, programming concepts, RDBMS concepts, and a whole lot more. Some are free (HTML 3.2, RDBMS Concepts) and others cost about $50 US. If you participate in their surveys you sometimes get free tests. And just recently in 'celebration' of their 5 millionth member joining they had all tests for free for a couple of days (unfortunately it is over now). So while the Zend certification is the top of the line (at $200/test and brand spanking new) this has been around for a while and well recognized.
