Googling around I've found this interesting project: http://phpbehind.agilemovement.it/index.phpx
It aims to implement a sort of code behind in PHP. While there isn't code ready to download yet there are some working examples with sources and little explanations.
What do you think about the proposed approach? I personally agree with the author whoen he says that he hate the fact that most of the other project force developers to write a lot of configuration/initialization code just to let the engine work.
Cheers