$check_stock = Stock::check($id);
 //check product - on any stock
 $res = mysqli_fetch_array($check_stock);
 $info_array = array();
 //array for sending multiple data by json to SavaScript
 if ($res['storehouse_id'] == $storehouse_id) {
     //if true - the goods already on this stock
     $info_f = 'This product is on this stock';
     $info_array[] = $info_f;
     //put the information into an array to send by json
     echo json_encode($info_array);
     //send json data to JavaScript
 } else {
     $change_stock = Stock::change_stock($id, $storehouse_id);
     //change the id warehouse
     $change_stock_product = Product::change_stock($id, $storehouse_id);
     //change the id warehouse
     if ($change_stock == TRUE && $change_stock_product == TRUE) {
         $warehouse_name = Storehouse::getStorehouse($storehouse_id);
         //get the name of the warehouse to display to the user from JavaScript
         $warehouse_name = mysqli_fetch_array($warehouse_name);
         $info = 'Product successfully transferred';
         $info_array[] = $info;
         //put the information into an array to send by json
         $info_array[] = $warehouse_name['name'];
         //put the information into an array to send by json
         echo json_encode($info_array);
         //send json data to JavaScript
     } else {
         $info_d = 'Please try again';
         $info_array[] = $info_d;