รู้สึกว่าต้องกอปปี้ไฟล์ตัวหนึ่งคือ ntwdblib.dll
The extension requires the MS SQL Client Tools to be installed on the system where PHP is installed. The Client Tools can be installed from the MS SQL Server CD or by copying ntwdblib.dll from \winnt\system32 on the server to \winnt\system32 on the PHP box. Copying ntwdblib.dll will only provide access through named pipes. Configuration of the client will require installation of all the tools.