Description:
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I can't select the version I'm using, which is 5.1.1, and for the record, I cannot upgrade the server to a newer version. As in, the bosses say so, so don't say to upgrade -- If it's confirmed fixed in a newer version, I think I can get them to do so.

Assuming a DB connection already.
$groupKeys is a long list of names separated by commas.

I cannot post the exact stored procedure, but it looks like:

CREATE  procedure dbo.proc_select_AllUserPerms
	@groupKeys varchar(8000)
as
        Lots of stuff.
GO

Looks the same to me.

I would like to point out, using a query 'exec dbo.proc_select_AllUserPerms \'' . $groupKeys . '\'' works fine, which is what I'll be forced to use until this is fixed.

Reproduce code:
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// assuming DB connection already
$dbConn = mssql_init('proc_select_AllUserPerms');
mssql_bind($dbConn, '@groupKeys', $groupKeys, SQLVARCHAR, false, false, 8000);
$result = mssql_execute($dbConn);

Expected result:
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It work.

Actual result:
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Unable to set parameter