<?php
class Badcontroller extends CI_Controller {

    public function do_save()
    {
          $orderdetails = [
            ['item_id' => 1, 'item_name' => 'Product ABC', 'qty' => 1, 'price' => 500, 'subtotal' => 500],
            ['item_id' => 2, 'item_name' => 'Product DEF', 'qty' => 2, 'price' => 100, 'subtotal' => 200]
          ];

          foreach ($orderdetails as $orderdetail) {
              $this->db->insert('orderdetails', $orderdetail);
          }
    }
}