PHP Universal Feed Generator (supports RSS 1.0, RSS 2.0 and ATOM)
May 11 2009, 4:22pm
"Features: * Generates RSS 1.0, RSS 2.0 and ATOM 1.0 feeds * All feeds are are validated by feed validator. * Supports all possible feed elements. * Simple and easy to define channel and feed items * Implements appropriate namespaces for different versions. * Automatically converts date formats. * Generates UUID for ATOM feeds. * Enables usage of subtags and attributes. (example: image and encloser tags) * Completely Object oriented in PHP5 class structure. * Handles CDATA encoding for required tags. * Nearly same code for generating all kinds of feed"
http://www.ajaxray.com/blog/2008/03/08/php-universal-feed-generator-supports-rss-10-rss-20-and-atom/