Today, we released a Community Technology Preview (CTP) of the SQL Server Driver for PHP 2.0 with support for PDO (PHP Data Objects). This new technical bridge for PHP developers that will reduce the complexity of targeting multiple databases and will make it easier for PHP applications to interoperate smoothly with Microsoft SQL Server 2005 and later.

Teammates have more details here on the interoperability blog

We’re looking forward to hearing from developers through the CTP process.