If using laravel, in your .env file:
DB_CONNECTION=sqlsrv DB_HOST=DESKTOP-91MB9QU\TESTSQLSERVER DB_PORT= DB_DATABASE=laravel_test DB_USERNAME=sa DB_PASSWORD='mypassword'
You can use it. Note that DB_CONNECTION=sqlsrv, DB_HOST must be in the format of "PC-name\SQL-server-name", and DB_PORT must be empty.
You can use it in a similar way as pure php code.