Fatal error: Uncaught mysqli_sql_exception: Access denied for user 'root'@'localhost' (using password: YES) in C:\xampp\htdocs\tuapp\dp.php:9 Stack trace: #0 C:\xampp\htdocs\tuapp\dp.php(9): mysqli->__construct('localhost', 'root', 'root', 'tuapp') #1 {main} thrown in C:\xampp\htdocs\tuapp\dp.php on line 9