Wordpress用户没有列出

Question

出于某种原因，我似乎无法从以下代码中获取任何用户...它有什么问题吗？我得到的只是“FUBAR”......

function current_user_access_level($type, $object) {
    if ( $type == 'users' ) {
        if ( empty( $object) ) {
            $return = 'FUBAR';
        } else {
            $current_user = wp_get_current_user();
            $user_id = $current_user->ID;
            $user_access_level = get_user_meta($user_id, 'wpcf-member-access-level', true);
            switch ($user_access_level) {
                case 1:
                    $return = '1'; 
                    break;
                case 2;
                    $return = '2'; 
                    break;
                case 3;
                    $return = '3'; 
                    break;
                case 4;
                    $return = '4'; 
                    break;
            }
        }
    }
    return $return;
}