protected static function cacheInfoDirectories( &$wildcardCacheDir, &$wildcardCacheFile, &$wildcardCachePath, &$wildcardKeys )
    {
        $info = self::cacheInfo();
        $wildcardCacheDir = $info['dir'];
        $wildcardCacheFile = $info['file'];
        $wildcardCachePath = $info['path'];
        $wildcardKeys = $info['keys'];
    }