Timber\Post::get_post_preview_id PHP Метод

    protected function get_post_preview_id($query)
    {
        $can = array('edit_' . $query->queried_object->post_type . 's');
        if ($query->queried_object->author_id !== get_current_user_id()) {
            $can[] = 'edit_others_' . $query->queried_object->post_type . 's';
        }
        $can_preview = array();
        foreach ($can as $type) {
            if (current_user_can($type)) {
                $can_preview[] = true;
            }
        }
        if (count($can_preview) !== count($can)) {
            return;
        }
        $revisions = wp_get_post_revisions($query->queried_object_id);
        if (!empty($revisions)) {
            $revision = reset($revisions);
            return $revision->ID;
        }
        return false;
    }