The SQLSRV extension can be used on the following operating systems:
The SQLSRV extension requires that the Microsoft SQL Server 2012 Native Client be installed on the same computer that is running PHP. If the Microsoft SQL Server 2012 Native Client is not already installed, click the appropriate link below to download it:
The SQLSRV download comes 8 driver files, four of which are for PDO support.
The most recent version of the driver is available for download here: ? SQLSRV download.
For more information about SQLSRV requirements, see ? SQLSRV System Requirements.