Funny… URI.js is more or less a port of my PHP URL class. Zend Framework has one. look at https://gist.github.com/1499238 to get you started. (Not a chainable API and not as powerful as URI.js either). The path resolving can be taken from the code I wrote for Smarty a couple of months ago: http://code.google.com/p/smarty-php/source/browse/trunk/dist... - lemme know if/when/how you're done… interested in using the PHP version myself ;)