Correct syntax for SQL Server instance?

Hello,

I’ve written PHP connector code to connect my DHX app with a back-end SQL Server 2008 database.

The database server is named ‘pd-sql-5’, and is running an instance named ‘pddb_test’. My PHP connector syntax is:

	$serverName = "pd-sql-5\pddb_test";

but I’m getting a non-descriptive server error message when testing it in the browser, and not getting any data back.

I have the same PHP code running on another SQL Server box, without an instance. The code seems to run fine.

Is there some special syntax needed when pointing to a SQL Server instance? Thanks.

Normally there is no any specific in connection strings for the connector.
Maybe caused by php configuration of related extensions.