如何在多维数组中传递模型中的数据

Question

我想获取＆＃39; $ quantity＆＃39;的数据。数组没有重复前面的索引值。在下面的代码中有一个重复的索引前值

$sql="select 
    tou.retailer_code,tou.retailer_name, tso.added_date,tso.sales_order_code,tsohfi.id_sales_order
     from
    tbl_sales_order_has_free_item tsohfi
    inner join 
    tbl_sales_order tso on
    tsohfi.id_sales_order=tso.id_sales_order
    inner join
    tbl_outlet_has_route tohr on 
    tso.id_outlet_has_route=tohr.id_outlet_has_route
    inner join
    tbl_outlet tou on
    tou.id_outlet=tohr.outlet_id
    inner join
    tbl_product tp on
    tp.product_id=tsohfi.product_id
    where tso.status=1 {$root}{$sales_date}
    group by tsohfi.id_sales_order
    ";  
  $free_sql = $this->db->mod_select($sql);
  foreach($free_sql as $value){

      $sql2="select 
            product_id,qty
            from
            tbl_sales_order_has_free_item
            where id_sales_order= $value->id_sales_order";

     $quantity_sql=$this->db->mod_select($sql2);

     foreach ($quantity_sql as $row)
    {

        $quantity[] = array(
                'product_id' => $row->product_id,
                'quantity' => $row->qty
              );
             } 


            $item_array[]=array(
            'retailer_code' => $value->retailer_code,
            'retailer_name' => $value->retailer_name,
            'added_date' => $value->added_date,
            'sales_order_code'=>$value->sales_order_code,
            'id_sales_order'=>$value->id_sales_order,
            'quantity'=>$quantity
               );
               }

      return $item_array;

重复循环的输出 我想得到[0]值1st和1值第二和[2]值在第三等