Microsoft SQL Server, the company’s flagship database software, has long been one of the company’s most. Introduction ¶. PDO_SQLSRV is a driver that implements the PHP Data Objects ( PDO) interface to enable access from PHP to MS SQL Server (starting with SQL Server 2005) and SQL Azure databases. For more information about system requirements, see » SQLSRV System Requirements. The PDO_SQLSRV extension. Microsoft SQL Server, the company’s flagship database…