rack-php Rack-php is a PHP 5.3 framework that adheres to the rack interface from the ruby world (http://rack.rubyforge.org/). It includes a simple php framework that lightly based around mvc. Instead of using php's built in $_SERVER variables, various adaptors are used. There is an adaptor for regular php web hosting (mod_php, mod_fcgid, etc...). These are the current methods of serving php sites.