Warning: mysqli::__construct(): (HY000/1045): Access denied for user 'root'@'localhost' (using password: NO) in D:\Program Files\xampp\htdocs\php7projects\machine_test\database.php on line 7

Fatal error: Uncaught Error: mysqli object is already closed in D:\Program Files\xampp\htdocs\php7projects\machine_test\index.php:5 Stack trace: #0 D:\Program Files\xampp\htdocs\php7projects\machine_test\index.php(5): mysqli_query(Object(mysqli), 'SELECT id,name ...') #1 {main} thrown in D:\Program Files\xampp\htdocs\php7projects\machine_test\index.php on line 5