Yes, this site is written using PHP.
We are currently using PHP 5.3.22 on the server and have no plans to move to 5.5, yet. I know there are some compatibility issues with phpBB3 so I'm going to monitor the situation to see how the move to PHP 5.5 affects other phpBB3 users. I do understand the latest version of phpBB3 is supposed to fully support PHP 5.5 but this site is so heavily customized, it would be a major undertaking to covert.
It might very well be that GC could be migrated to PHP 5.5 with just a few minor changes to the code but I'd want to test on a mirror site, or at least determine from others who have moved to PHP 5.5 what the pitfalls are, before I'd commit to the update.
As the old saying goes, "If it ain't broke, don't fix it".
