Fatal error: Uncaught PDOException: SQLSTATE[HY000] [1049] Unknown database 'ac222' in S:\xampp240306\htdocs\QnA\230109trial\pre_.php:47 Stack trace: #0 S:\xampp240306\htdocs\QnA\230109trial\index.php(4): include() #1 {main} thrown in S:\xampp240306\htdocs\QnA\230109trial\pre_.php on line 47