$user = new User(); $user->setRealName("John Doe");
$user = new Customer(); $user->setRealName("Mary Smith");The package library in this case would depend on the specific framework or CMS being used. For example, if the application is built using Laravel, the User class might be part of the Laravel's built-in authentication system. Similarly, in WordPress, the User class might be part of the WP_User class provided by the WordPress core.