CSScaffold is a CSS framework written in PHP. Rather than try and create a static framework that uses the standard abilities of CSS, like Blueprint, it uses PHP to extend CSS. The syntax looks and feels exactly like CSS, except that you have some new, powerful abilities.
The best part is that all of this is done transparently. You can drop Scaffold into your site and you’ll instantly have access to all of its functionality. Scaffold requires a web server with PHP 5+. Mod_rewrite for Apache is required if you want it work automatically route your css files through Scaffold.