PDO mssql 驱动没有了，使用sqlsrv(php windows下)或dblib(下php linux)

The PDO mssql driver is no more, use sqlsrv (under php windows) or dblib (under php linux)

http://msdn.microsoft.com/en-us/sqlserver/ff657782.aspx

http://www.php.net/manual/en/ref.pdo-dblib.php