Microsoft announced an important interoperability milestone with the release of Microsoft Drivers for PHP for SQL Server 2.0!! provide connectivity to SQL Server from PHP apps.
"major highlight is the addition of PDO_SQLSRV driver, which adds support for PHP Data Objects (PDO). Providing PDO_SQLSRV driver enables popular PHP apps to use PDO data access "style" to interoperate with SQL Server database and make it easier for PHP developers to take advantage of SQL Server's proven track record and to leverage features such as SQL Server's Reporting Services and Business Intelligence capabilities. In addition to accessing SQL Server, both drivers (SQLSRV and PDO_SQLSRV) also enable PHP developers to easily connect to and use Microsoft's cloud database offering, SQL Azure, and enjoy the benefits of a reliable and scalable relational database in the cloud, as well as functionality like exposing OData feeds."