I've been using rails a lot lately and have been looking for a php framework that can give me a similar level of productivity. There are lots of php MVC frameworks [1]. Here are some that seem to be directly inspired by rails.

• Biscuit [2]
• Php on Trax [3]
• CakePHP [4]
• TaniPHP [5]

After looking at each of them I've decided to go with Cake on my current project. It is simple and easy to use, works with php4 and is far ahead of the others in terms of documentation.