PHP-Halo-Reach-API-Library is a project mainly written in PHP, it's free.
A PHP code library for the Halo: Reach API.
PHP Halo Reach Library
This code has been heavily stolen from dazarobbo of the bungie.net forums. Props and thanks go to him (her?).
Original Bungie.net Thread: http://www.bungie.net/fanclub/359873/forums/posts.aspx?postID=49907528 dazarobbo's Bungie.net Member Page: http://www.bungie.net/Account/Profile.aspx?memberID=2758679
I merely repurposed the files and added minor enhancements.