สอบถามเรื่องการ วนลูป Array ซ้อน array ข้างในอีกที่ ครับ เป็น CodeIgniter ครับ

Array
(
    [0] => Array
        (
            [0] => stdClass Object
                (
                    [ProductID] => 1
                    [ProductName] => NAMASTE INDIA ชัยปุระ อัครา เดลี
                    [ProductCode] => CZDEL01
                    [Country] => INDIA
                    [FileWord] => 1_20190212123611.docx
                    [FilePDF] => 1_20190212123611.pdf
                    [UrlImage] => 1_20190212114657.png
                    [Airline] => 9W
                    [HotelStar] => 3
                )

        )

    [1] => Array
        (
            [0] => stdClass Object
                (
                    [PeriodID] => 1
                    [PeriodStartDate] => 2019-05-03
                    [PeriodEndDate] => 2019-05-07
                    [Day] => 5
                    [Night] => 3
                    [Airline] => 9W
                    [Price_Twin] => 18999.00
                    [Price_Single] => 4999.00
                    [Price_Infant] => 10000.00
                    [ComAgent] => 1000
                    [ComSale] => 500
                    [Groupsize] => 3
                    [Book] => 0
                    [Seat] => 20
                    [Status] => Book
                    [UpdateDate] => 2019-05-03 21:16:00
                )

            [1] => stdClass Object
                (
                    [PeriodID] => 1
                    [PeriodStartDate] => 2019-05-17
                    [PeriodEndDate] => 2019-05-21
                    [Day] => 5
                    [Night] => 3
                    [Airline] => 9W
                    [Price_Twin] => 18999.00
                    [Price_Single] => 4999.00
                    [Price_Infant] => 10000.00
                    [ComAgent] => 1000
                    [ComSale] => 500
                    [Groupsize] => 3
                    [Book] => 0
                    [Seat] => 25
                    [Status] => Book
                    [UpdateDate] => 2019-05-03 21:16:00
                )

            [2] => stdClass Object
                (
                    [PeriodID] => 1
                    [PeriodStartDate] => 2019-05-10
                    [PeriodEndDate] => 2019-05-14
                    [Day] => 5
                    [Night] => 3
                    [Airline] => 9W
                    [Price_Twin] => 17999.00
                    [Price_Single] => 4999.00
                    [Price_Infant] => 10000.00
                    [ComAgent] => 1000
                    [ComSale] => 500
                    [Groupsize] => 3
                    [Book] => 0
                    [Seat] => 20
                    [Status] => Book
                    [UpdateDate] => 2019-05-03 21:16:00
                )

        )

)

Array
(
    [0] => Array
        (
            [0] => stdClass Object
                (
                    [ProductID] => 1
                    [ProductName] => NAMASTE INDIA ชัยปุระ อัครา เดลี
                    [ProductCode] => CZDEL01
                    [Country] => INDIA
                    [FileWord] => 1_20190212123611.docx
                    [FilePDF] => 1_20190212123611.pdf
                    [UrlImage] => 1_20190212114657.png
                    [Airline] => 9W
                    [HotelStar] => 3
                )
            [0] => stdClass Object
                (
                    [PeriodID] => 1
                    [PeriodStartDate] => 2019-05-03
                    [PeriodEndDate] => 2019-05-07
                    [Day] => 5
                    [Night] => 3
                    [Airline] => 9W
                    [Price_Twin] => 18999.00
                    [Price_Single] => 4999.00
                    [Price_Infant] => 10000.00
                    [ComAgent] => 1000
                    [ComSale] => 500
                    [Groupsize] => 3
                    [Book] => 0
                    [Seat] => 20
                    [Status] => Book
                    [UpdateDate] => 2019-05-03 21:16:00
                )

            [1] => stdClass Object
                (
                    [PeriodID] => 1
                    [PeriodStartDate] => 2019-05-17
                    [PeriodEndDate] => 2019-05-21
                    [Day] => 5
                    [Night] => 3
                    [Airline] => 9W
                    [Price_Twin] => 18999.00
                    [Price_Single] => 4999.00
                    [Price_Infant] => 10000.00
                    [ComAgent] => 1000
                    [ComSale] => 500
                    [Groupsize] => 3
                    [Book] => 0
                    [Seat] => 25
                    [Status] => Book
                    [UpdateDate] => 2019-05-03 21:16:00
                )

            [2] => stdClass Object
                (
                    [PeriodID] => 1
                    [PeriodStartDate] => 2019-05-10
                    [PeriodEndDate] => 2019-05-14
                    [Day] => 5
                    [Night] => 3
                    [Airline] => 9W
                    [Price_Twin] => 17999.00
                    [Price_Single] => 4999.00
                    [Price_Infant] => 10000.00
                    [ComAgent] => 1000
                    [ComSale] => 500
                    [Groupsize] => 3
                    [Book] => 0
                    [Seat] => 20
                    [Status] => Book
                    [UpdateDate] => 2019-05-03 21:16:00
                )

        )
)

<?php
defined('BASEPATH') OR exit('No direct script access allowed');
class Test_Api_Con extends CI_Controller {
    
    public function get_api_test_product()
    {
        $this->load->model('Models_Api_Product');

        $obj = new Models_Api_Product();
        $product = new Models_Api_Product();
        $periods = new Models_Api_Product();

        $list_product = array();
        $list_periods = array();
        $list = array();
        $dataproductall = $obj->testapiproductALL();
        foreach ($dataproductall as $listproduct) 
        {

            $product->DatatoObjProduct($listproduct);
            
            $this->db->reconnect();
            $subdata_product = $periods->testapiproductList($product->ProductID);
            $list_product[] = $subdata_product;
            
           
            foreach($subdata_product as $listperiods)
            {
                
                $this->db->reconnect();
                $subdata_periods = $periods->testapiperiod($product->ProductID);
                
                $list_product[] = $subdata_periods;
            } 
        }
        echo json_encode($list_product);
        /*echo "<pre>";
        print_r($list_product);
        echo "</pre>";
        */
    }

    public function testapiproductALL()
    {
        $data = $this->db->query("CALL Test_API_Product()");
        $result = $data->result();       
        return $result;
    }
    public function testapiproductList($productid)
    {
        $data = $this->db->query("CALL Test_API_Product_list('{$productid}')");
        $result = $data->result();       
        return $result;
    }

    public function testapiperiod($periods)
    {
        $data = $this->db->query("CALL Test_Periods('{$periods}')");
        $result = $data->result();       
        return $result;
    }