How can I obtain the out parameter value of the mysql stored procedure?

How can I obtain the out parameter value of the mysql stored procedure? I found it as follows: & nbsp; mysql_query ("call & nbsp; P _ Test_Login (@ Message, & nbsp; @ Id, & nbsp; '{$ userId}', & nbsp; '{$ pwd}') ", & ask how to obtain the out parameter value of the mysql stored procedure
I found it as follows:

Mysql_query ("call P _ Test_Login (@ Message, @ Id, '{$ userId}', '{$ pwd}')", $ conn) or die ("Query failed :". mysql_error ());
$ Result_mess = mysql_query ("select @ Message ");
$ Result_uid = mysql_query ("select @ Id ");
$ Row_mess = mysql_fetch_row ($ result_mess );
$ Row_uid = mysql_fetch_row ($ result_uid );
$ Proc_Error = $ row_mess [0];
$ UId = $ row_uid [0];

In this way, the stored procedure is executed and then used continuously.
$ Result_mess = mysql_query ("select @ Message ");
$ Result_uid = mysql_query ("select @ Id ");

This is equal to whether two consecutive requests are sent to the database, and the pressure is too high.
I want to send a request and obtain the output parameters. Is there no way to do this? Share:
------ Solution --------------------
Select @ Id as id, @ Message as message;