When using stored procedures with MySQL, you will often need to use the mysqli interface in PHP and not the regular mysql interface.
The reason for this is due to the fact that the stored procedures often will return more than 1 result set. If it does, the mysql API can not handle it and will you get errors.
The mysqli interface has functions to handling these multiple result sets, functions such as mysqli_more_results and mysqli_next_result.
Keep in mind that if you return any result set at all from the stored procedure, then you need to use these APIs, as the stored procedure generates 1 result set for the actual execution, and then 1 additional one for each result set intentionally returned from the stored procedure.
