function sync_all_dishes_ingredients()
 {
     $query = "SELECT `id` FROM `dishes`";
     $res = common_query($query, __FILE__, __LINE__);
     if (!$res) {
         return 0;
     }
     while ($arr = mysql_fetch_array($res)) {
         $dish = new dish($arr['id']);
         if ($err = $dish->sync_dish_ingredients()) {
             return $err;
         }
     }
     return 0;
 }