Internal PHP caching methodology

Hello, Call me a dreamer...but I got to ask. Is there any software for helping speed up PHP by utilizing internal PHP caching? I am not talking about the external php cache/header control. Smarty caching doesn't give me the control I need either. I would like to cache to a finer level than page by page, but rather on a module by module basis. Each of my pages contains a subset of modules. The content of these modules changes based upon certain criteria (link, time, session data, but is sometimes static across the site). I would like to be able to cache individual "modules" (preferably based upon frequency and time to generate). I am trying to develop a way to do this, but I have to think a brighter mind has come before me and hopefully arrived at a solution. As always any help/thoughts are much appreciated, except for that one guy's comments (you all know who I am talking) ~ jk ;) Thanks, `