converting multiple URL values for the same variable into an array

I'm modifying some code for ampache (ampache.kveton.com) and have run into a snag that I'm not sure I understand completely. Part of the code produces a URL similar to the following: http://myhost/playlist.pls?song=100&song=101&song=102 and $song then gets passed to this function: function get_song_path_from_id ( $song ) { GLOBAL $dbh, $db_name; $songs = ''; $count = 0; if ( is_array( $song ) ) { while ( list($k,$v) = each($song) ) { //does some cool stuff } } else { //does some other stuff } return ($songs); } So, am I correct in assuming that $song will never be considered an array? (basically, given the above code and URL, $song will always equal 102) I'm new to PHP, and since I didn't write the original code, I'm not sure if this is a bug, or something that I just don't fully understand. Assuming it is a bug, can anyone offer some suggestions on how to take the URL and parse it out and input the values into an array called $song? (get_song_path_from_id() is used by several other parts of the code, so any modifications to that code would need to leave the rest of the functionality intact) Thanks. --kurt P.S. If anyone is looking for a simple, easy-to-use (and set up) mp3 manager, I highly recommend ampache. It doesn't have a bunch of bells & whistles (which I don't want) -- it simply provides a simple, effective way to manage playlists and play your mp3 songs from anywhere.