Fatal error: Uncaught mysqli_sql_exception: Access denied for user 'root'@'localhost' (using password: NO) in C:\xampp\htdocs\test\curd1\add-edit-delete.php:8 Stack trace: #0 C:\xampp\htdocs\test\curd1\add-edit-delete.php(8): mysqli_connect('localhost', 'root', '', 'demos') #1 {main} thrown in C:\xampp\htdocs\test\curd1\add-edit-delete.php on line 8