Is there a limit of mssql_bind calls you can make when calling mssql_execute?

It seems that the maximum number of parameters I can bind using
mssql_bind and an execute statement is 30. If we go beyond we get an
error of "mssql_execute(): could not retrieve results".
Can anyone confirm that this is a limitation (of PHP4 or of MSSQL 2000)
and if so, can it be modified?

When we use mssql_query we can go beyond 30 parameters. Unfortunately
there is a case where using mssql_query is not an option.

Thanks,
Greg

There is a bug in MSSQL Client Libraries that avoid sending varchar
parameters for more than 255 characters to a stored procedure. Use
mssql_query instead.

http://ie2.php.net/manual/en/function.mssql-bind.php

Could this be the reason?

It doesn't seem to be the problem since we've duplicated it with many
different stored procedures and they always fail on the 31st parameter
added.