同时使用insert_id和两个插入db表（codeigniter）

Question

我需要你的帮助。 我想同时使用insert_id和两个插入数据表。 enter image description here

function add_donhang(){
        $this->db->insert('donhang', array(
            'tendonhang' => $this->input->post('txttendonhang'),
            'madonhang' => $this->input->post('txtmadonhang'),
            'idkhachhang' => $this->input->post('idkhachhang'),
        )); // after insert table "donhang" and at the same time insert into "phieuxuatkho"
        $this->db->insert('phieuxuatkho', array(
            'tendonhang' => $this->input->post('txttendonhang'),
        ));
        $id = $this->db->insert_id(); // Get id of "donhang".
        $id2 = $this->db->insert_id(); // Get if of "phieuxuatkho". 
        if ($id) {
            $dulieusp = array();
            $dsmasp = $this->input->post('masp');
            $dstensp = $this->input->post('tensp');
            $dsslsp = $this->input->post('soluong');
            $dsmsp = $this->input->post('midsp');
            foreach ($dsmasp as $key => $item) {
                $dulieusp[] = array(
                    'masanpham' => $item,
                    'tensanpham' => $dstensp[$key],
                    'madonhang' => $id, //id of "donhang".
                    'maphieuxuat' => $id2, //if of "phieuxuatkho". 
                    'idsanpham' => $dsmsp[$key],
                    'soluong' => $dsslsp[$key],
                );
            }
            if (count($dulieusp)) {
                $this->db->insert_batch('chitietdonhang', $dulieusp);
            }
            return array(
                'type' => 'successful',
                'message' => ' Thêm Đơn Hàng Thành Công'
            );
        } else {
            return array(
                'type' => 'error',
                'message' => ' Không Có Đơn Hàng Thêm Vào'
            );
        }
    }

我怎么能用简单的方法做到这一点。谢谢你的帮助