I'm running PHP Version 5.2.4..
Here's an example of what it's doing:
Test - tttestttttt Animated Gif Dump
Just so you can see that it seems to be running through twice (well, physically the name is only ran once, but the filename stored for that image shows it ran through twice)...
Here's the actual filename that is stored in the filesystem:
http://www.sitexperience.com/gifdump...1afd0c7de5.gif