Fatal error: Uncaught mysqli_sql_exception: Unknown database 'codexworld_db' in C:\xampp\htdocs\TC\login_with_google_using_php\User.class.php:22 Stack trace: #0 C:\xampp\htdocs\TC\login_with_google_using_php\User.class.php(22): mysqli->__construct('localhost', 'root', Object(SensitiveParameterValue), 'codexworld_db') #1 C:\xampp\htdocs\TC\login_with_google_using_php\index.php(6): User->__construct() #2 {main} thrown in C:\xampp\htdocs\TC\login_with_google_using_php\User.class.php on line 22