function versionedKey($key) {
        if ($key == self::TR8N_VERSION_KEY) return $key;
        return self::TR8N_KEY_PREFIX . $this->version() . "_" . $key;
    }
function versionedKey($key) {
        if ($key == self::TR8N_VERSION_KEY) return $key;
        return self::TR8N_KEY_PREFIX . $this->version() . "_" . $key;
    }
function versionedKey ( $ key ) { if ( $ key == self :: TR8N_VERSION_KEY ) return $ key ; return self :: TR8N_KEY_PREFIX . $ this -> version ( ) . "_" . $ key ; }
Appends version to a key

@param string $key
@return string
Appends version to a key