For anybody who looks for the MPHP3 PHP class I wrote several years ago when i was still in school (and had time to do such stuff):

I put it offline, because it had several issues and I’m not into PHP anymore. I think it’s fascinating how much it got used, but I also think that you can find better maintained libraries to do this job. I think php-reader looks decent but I haven’t tested it.

I wonder on how many sites it is still used. Googling it at least reveals some sites by error messages from within the file. Thanks to everyone who suggested it as a solution for the problem of computing the duration of a MP3 file or reading ID3 tags within php.