Description:
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mssql_bind function does not seem to be working when trying to bind return value (RETVAL) from stored procedure.

Reproduce code:
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// OPEN CONNECTION, ETC...

$customer_id = <INTEGER GOES HERE>;
$subject_id = <INTEGER GOES HERE>;

mssql_bind($query, "RETVAL", &$retval, SQLINT1);             
mssql_bind($query, "@iCustomerID", &$customer_id, SQLINT4);  
mssql_bind($query, "@iSubjectID", &$subject_id, SQLINT4);  
$result = mssql_execute($query); 
mssql_close($dbc);

Expected result:
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I expect to have $retval equall something else than '0' in many cases--but it always equalls '0'. The same code gives the expected results in PHP 4.2.1 on MS Windows Server.