mysql_get_proto_info -- Get MySQL protocol info<br>Description
int mysql_get_proto_info ([resource link_identifier])
mysql_get_proto_info() returns the protocol version used by connection link_identifier. If link_identifier is omited, the last opened connection will be used. <br>返回连接标识符使用的协议版本,如果没有指定连接标识符,则使用最后打开的那个