Fatal error: Uncaught mysqli_sql_exception: Unknown database 'test' in E:\xampp\htdocs\customer\connect.php:8 Stack trace: #0 E:\xampp\htdocs\customer\connect.php(8): mysqli->__construct('localhost', 'root', '', 'test') #1 E:\xampp\htdocs\customer\insert.php(1): include('E:\\xampp\\htdocs...') #2 {main} thrown in E:\xampp\htdocs\customer\connect.php on line 8