i believe you mean phpbb? cuz this forum does support that and its php (look at file extension, index.PHP?)
invision power board ( this board ) are made up of mostly php files, but he isnt talking about forums with php, hes talking about phpBB .
Phpbb mods, there was a rep mod but i dont know if its still being released. Because i couldnt find it before and just went with Ipb. http://www.phpbb.com/phpBB/catdb.php?db=1 <-- phpbb mods.