/**
  * 	Copy booking
  */
 public function copy_booking($id_booking)
 {
     global $wpdb;
     try {
         $booking = $wpdb->get_row($wpdb->prepare('SELECT * FROM `' . CarRental::$db['booking'] . '` WHERE `id_booking` = %d', $id_booking));
         $prices = $wpdb->get_results($wpdb->prepare('SELECT * FROM `' . CarRental::$db['booking_prices'] . '` WHERE `id_booking` = %d', $id_booking));
         $drivers = $wpdb->get_results($wpdb->prepare('SELECT * FROM `' . CarRental::$db['booking_drivers'] . '` WHERE `id_booking` = %d', $id_booking));
         // Save Branch to DB
         $arr = array();
         foreach ($booking as $key => $val) {
             $arr[$key] = !is_null($val) ? $val : NULL;
         }
         // Generate new Order ID
         $arr['id_order'] = CarRental::generate_unique_order_id();
         unset($arr['id_booking']);
         unset($arr['updated']);
         unset($arr['deleted']);
         $wpdb->insert(CarRental::$db['booking'], $arr);
         $id_booking = $wpdb->insert_id;
         // Save Prices
         if (!empty($prices)) {
             foreach ($prices as $key => $val) {
                 $arr = array('id_booking' => $id_booking, 'name' => $val->name, 'price' => $val->price, 'currency' => $val->currency);
                 $wpdb->insert(CarRental::$db['booking_prices'], $arr);
             }
         }
         // Save Drivers
         if (!empty($drivers)) {
             foreach ($drivers as $key => $val) {
                 $arr = array();
                 foreach ($val as $kD => $vD) {
                     $arr[$kD] = $vD;
                 }
                 $arr['id_booking'] = $id_booking;
                 unset($arr['id_driver']);
                 $wpdb->insert(CarRental::$db['booking_drivers'], $arr);
             }
         }
         return true;
     } catch (Exception $e) {
         return $e->getMessage();
     }
 }