Michael Booth's comparison of BDD testing features in both languages:
http://mechanicalrobotfish.com/posts/117-ruby-vs-php-bdd-beauty-contest-no-contest
concludes that PHP BDD tools and culture is underdeveloped at this point.
Certainly there is nothing comparable with what's available to a Ruby programmer, either in terms of knowledge (books, videos, articles, blog posts) or tools (Rspec, Shoulda, Factory Girl, Mocha, Cucumber).
