As of June 2010, the SQL Server Driver for PHP V2.0 CTP2 is available for download.
The SQL Server Driver for PHP is a PHP 5 extension that allows for the reading and writing of SQL Server data from within PHP scripts. The extension provides a native procedural and PDO interfaces for accessing data in all editions of SQL Server 2005 and later including SQL Azure.
Please don’t forget to check the System Requirements. One thing I noticed here is, this driver is for Any edition of SQL Server 2005 or SQL Server 2008.
Click here to get more information : http://www.microsoft.com/downloads/details.aspx?FamilyID=DF4D9CC9-459C-4D75-A503-AE3FCEB85860&displaylang=en
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Happy Learning !!!