The SQL Server  Driver for PHP is a PHP 5 extension that provides data access to SQL Server 2005 and SQL Server 2008. The extension provides a procedural interface for accessing data in all versions (including Express) of SQL Server 2005 and SQL Server 2008. The SQL Server 2005 Driver for PHP API includes support for Windows Authentication, transactions, parameter binding, streaming, metadata access, and error handling.

This driver is supported on all IIS7 shared hosting servers.

Here is a list of references for this extension.

API Reference- http://msdn.microsoft.com/en-us/library/cc296152(SQL.90).aspx

SQLSRV Constants- http://msdn.microsoft.com/en-us/library/cc296183(SQL.90).aspx

Example Application- http://msdn.microsoft.com/en-us/library/cc296196(SQL.90).aspx