Fatal error: Uncaught mysqli_sql_exception: Unknown database 'crud_db' in C:\xampp\htdocs\crud_php\db.php:7 Stack trace: #0 C:\xampp\htdocs\crud_php\db.php(7): mysqli->__construct('localhost', 'root', Object(SensitiveParameterValue), 'crud_db') #1 C:\xampp\htdocs\crud_php\index.php(2): include('C:\\xampp\\htdocs...') #2 {main} thrown in C:\xampp\htdocs\crud_php\db.php on line 7