var $table = "users";
      var $select_column = array("id", "first_name", "last_name", "image");
      var $order_column = array(null, "first_name", "last_name", null, null);

// penerjemahan kode dimulai dari sini

  if(isset($_POST["order"]))
           {
                $this->db->order_by($this->order_column[$_POST['order']['0']['column']], $_POST['order']['0']['dir']);
           }

 if($_POST["length"] != -1)
           {
                $this->db->limit($_POST['length'], $_POST['start']);
           }