FeedCreator, by Kai Blankenhorn, is a great PHP class to use when you want to build RSS feeds from your own content. I use this class extensively on all of the sites that make up Jack’s Sports Report and have been really happy with it.

It’s painfully easy to use and it takes care of any caching requirements automatically for you. Here’s a list of FeedCreator’s main features:

• Creates valid feeds according to RSS 0.91, 1.0 or 2.0 as well as PIE 0.1 (deprecated), OPML 1.0, Unix mbox, ATOM 0.3, or customizable HTML or Javascript format
• Configurable feed caching
• Feed image
• Includes almost all RSS 0.91 attributes
• Intelligently truncates strings when needed

There’s a really good piece of example code on the FeedCreator site if you get stuck.