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Update January 19, 2010: This script is now available on GitHub. Go forth and fork.
Today I noticed that my now ancient PHP script to update Twitter automatically using PHP/cron needed to be updated. It turns out that Twitter stopped recognizing URLs with ? in them as clickable links. Here is an example tweet where you'll notice this happening.
I could have told Twitter and asked that they update the way they handle URLs but in reality my script was old, slow, too long, and shouldn't include ? anyway so I figured I'd write a new one from scratch that included my short URL scheme.
So, here is the PHP script to parse an RSS feed and send the posts to Twitter. It includes a caching mechanism so that you won't have duplicate URLs posted to Twitter. If you want it, take it. However, if you are better than I am at PHP (most 6yr. olds are better than I am at programming) then I ask that you fork the script on Gist and try to improve it.
Next up we have Anthony Sterling, self-proclaimed "PHP addict", who has rewritten the script to make the configuration a bit easier. He also changed the way the cache is saved. He's using a hashed version of the title for each post as his key. I do not believe this to be the best way to go, since post titles can easily change after publishing - but I do like that the script is about 20 lines shorter and the code is arguably cleaner.
Thanks to both Kyle and Anthony for their versions. Lets keep this going and see if we can get this script much more succinct, stable, faster, and usable by others?