[Deadline Approaching] Using PHP to join MP3s

Hi There!

I am building a short audio sequencer in flash and I need to save the output as mp3 files.

Sounds are generated by the flash app playing mp3 files at a certain time. Now apparently for my application, a PHP class is probably the best way to do this (PHP driven backend). I did some digging around and found this:

http://www.sourcerally.net/Scripts/20-PHP-MP3-Class

However, this is really all greek to me. I can just about read files from a database, that is way above my station. All i need is a simple join script, where I send PHP the file reference and time its need to “play” them, and it creates a joined file.

Can anybody help with this? Anyone know some resources in this area? my deadline is a week and a bit away and im starting to panic!

Steve