Habari\Post::list_revisions PHP Метод

    public function list_revisions()
    {
        $sql = <<<LIST_REVISIONS
SELECT DISTINCT
change_date, user_id
FROM {revisions}
WHERE post_id = :post_id;
LIST_REVISIONS;
        return DB::get_keyvalue($sql, array('post_id' => $this->id));
    }