Unable to load dynamic library php_sqlsrv_7_nts.dll is not a valid Win32 application
Finally got this solved. Needed to install some more things before it would work, namely:
Microsoft Visual C++ 2015 Redistributable (x86) which you can get from here
The ODBC drivers which you can get from here
It works for me.
1.Download the extension windows 7.0 https://github.com/Microsoft/msphpsql/releases
2.And then according to the system requirement paste it in ext folder. Note: Paste only the thread safe version (php_pdo_sqlsrv_7_ts.dll , php_sqlsrv_7_ts.dll)
3.And edit the php.ini file add this extension to your php.ini file and restart and check