/**
  * Retrieves database client/server protocol version.
  * @param resource $connection (optional)	The database server connection, for detailed description see the method query().
  * @return int/boolean						Returns the protocol version on success or FALSE on failure.
  */
 public function get_proto_info($connection = null)
 {
     return self::use_default_connection($connection) ? mysqli::mysqli_get_proto_info() : mysqli::mysqli_get_proto_info($connection);
 }