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However, not all of the software we use has been so zealous. As a result, over the past year and a half, customers and prospective buyers alike have noticed compatibility error messages riddled across the site. Unfortunately for us, the developers of vBulletin, the forum software we primarily supported for the past 5 years, did not keep their software up-to-date with respect to new versions of PHP.After a year and a half of waiting for an update, including one that was promised to resolve the issues and ended up making no headway in that respect, and countless complaints from our own customers and lost leads, we have officially downgraded our front-end site from PHP 5.4 to PHP 5.3.
Again this is in no way a reflection on PHP itself, but rather on vBulletin. We do hope they release a compatibility update soon, especially as PHP 5.5 recently had a stable public release. If ever this happens, we will surely update to the newest compatible PHP version there is.
Despite the site being an older version of PHP, we will still be developing VaultWiki and maintaining it to be compatible with the newest PHP releases. Any portions of our web site that do not rely on vBulletin (like the XenForo demo and some other minor areas) will use PHP 5.5 or whatever the newest stable release is at the time.