Notice: session_start(): Ignoring session_start() because a session is already active in D:\WEB\ShopBack_Web\conn.php on line 3

Fatal error: Uncaught PDOException: could not find driver in D:\WEB\ShopBack_Web\conn.php:16 Stack trace: #0 D:\WEB\ShopBack_Web\conn.php(16): PDO->__construct('sqlsrv:server=1...', 'chen', Object(SensitiveParameterValue)) #1 D:\WEB\ShopBack_Web\header1.php(1): include('D:\\WEB\\ShopBack...') #2 D:\WEB\ShopBack_Web\product\ProductList.php(1): include('D:\\WEB\\ShopBack...') #3 D:\WEB\ShopBack_Web\route.php(106): include('D:\\WEB\\ShopBack...') #4 D:\WEB\ShopBack_Web\index.php(5): require('D:\\WEB\\ShopBack...') #5 {main} thrown in D:\WEB\ShopBack_Web\conn.php on line 16