Gdn_Cache::getPrefix PHP Method

    public function getPrefix($ForcePrefix = null, $WithRevision = true)
    {
        static $ConfigPrefix = false;
        // Allow overriding the prefix
        if (!is_null($ForcePrefix)) {
            return $ForcePrefix;
        }
        // Keep searching for the prefix until it is defined
        if ($ConfigPrefix === false) {
            // Allow vfcom-infrastructure to set the prefix automatically
            if (defined('FORCE_CACHE_PREFIX')) {
                $ConfigPrefix = FORCE_CACHE_PREFIX;
            }
            if ($ConfigPrefix === false) {
                $ConfigPrefix = c('Cache.Prefix', false);
            }
        }
        // Lookup Revision if we have a prefix.
        $RevisionNumber = false;
        if ($WithRevision && $ConfigPrefix !== false) {
            $CacheRevision = $this->getRevision($ConfigPrefix);
            if (!is_null($CacheRevision)) {
                $RevisionNumber = $CacheRevision;
            }
        }
        $Response = $ConfigPrefix;
        if ($WithRevision && $RevisionNumber !== false && $ConfigPrefix !== false) {
            $Response .= ".rev{$RevisionNumber}";
        }
        return $ConfigPrefix === false ? null : $Response;
    }