Warning: Undefined variable $username_db in /var/www/html/registrati.php on line 10

Warning: Undefined variable $password_db in /var/www/html/registrati.php on line 10

Fatal error: Uncaught mysqli_sql_exception: Access denied for user ''@'172.18.0.8' (using password: NO) in /var/www/html/registrati.php:10 Stack trace: #0 /var/www/html/registrati.php(10): mysqli->__construct('db', NULL, Object(SensitiveParameterValue), 'mambo_db') #1 {main} thrown in /var/www/html/registrati.php on line 10