Warning: mysqli::__construct(): (HY000/1045): Access denied for user 'root'@'localhost' (using password: NO) in C:\xampp\htdocs\central_juan\cols.php on line 2

Fatal error: Uncaught Error: mysqli object is already closed in C:\xampp\htdocs\central_juan\cols.php:3 Stack trace: #0 C:\xampp\htdocs\central_juan\cols.php(3): mysqli->query('SHOW COLUMNS FR...') #1 {main} thrown in C:\xampp\htdocs\central_juan\cols.php on line 3