PHP has quickly become a favorite language. There is no Plumtree GDK for PHP, but I explain how I can still use PHP in Plumtree gadgets. I like PHP for the ease with which it allows developers to access variables from web sessions and the quick access it allows to databases. I'm also a sucker for procedural as opposed to object-oriented programming, and PHP has got functions galore. It is also marvelously well documented at PHP.net, which makes it very easy to succeed quickly in PHP projects.
A site made uses PHP for its administrative interface and to manage its monthly updates.
I have created a fairly feature-rich content management/site-builder application in PHP that I have rolled out to non-profit groups needing easier control of their web content.