add user role and login state to body class wordpress

user-role-body-class.php

add_filter('body_class','add_role_to_body');
function add_role_to_body($classes) {
$current_user = new WP_User(get_current_user_id());
$user_role = array_shift($current_user->roles);
$classes[] = 'role-'. $user_role;

$classes[] = !is_user_logged_in() ? 'not-logged-in' : '' ;
return $classes;
}