A few weeks ago WSO2 released WSF/PHP, a PHP extension that brings full WS-* functionality to PHP. This means that a PHP script can integrate with any system over Web services at full fidelity, including security and reliability. PHP does not need to be the step-child in the enterprise anymore!
Personally, I don’t care about PHP at all. But I’m very much looking forward to the same stuff for Ruby and Python — yet another step towards acceptance in enterprisey circles …
If support for the mess that is WS-gobbledigood is what is required for “enterprisey circles” then I would stick to squares and REST myself.