Description:
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As per the documentation, mssql_num_rows() returns the number of rows in a result set. It works fine, if stored procedure returns some records. But it gives following error when stored procedure returns nothing (empty recordset). 

mssql_num_rows(): supplied argument is not a valid MS SQL-result resource

mssql_num_rows() should return 0, when no records are returned from stored procedure.


It seems that the problem is with mssql_execute(). It does not return any Resource ID, if the result is empty. Hence, mysql_num_rows() fails which expects Resource ID as the parameter.