php – 如何在结帐页面上显示当前购物车产品的详细信息

提前致谢.
我是opencart的新手,我正在开发opencart的购物车,一切都很顺利,但我遇到了困难,请帮忙

我想访问checkout.tpl中当前添加的购物车项目以生成查询表单,因此我正在编辑controller / checkout.php并添加这些代码行以访问当前购物车中的产品详细信息：

//Product detail for Enquiry    
    $product_data = array();

    foreach ($this->cart->getProducts() as $product) {
        $option_data = array();

        foreach ($product['option'] as $option) {
            if ($option['type'] != 'file') {
                $value = $option['option_value'];   
            } else {
                $value = $this->encryption->decrypt($option['option_value']);
            }   

            $option_data[] = array(
                'product_option_id'       => $option['product_option_id'],'product_option_value_id' => $option['product_option_value_id'],'option_id'               => $option['option_id'],'option_value_id'         => $option['option_value_id'],'name'                    => $option['name'],'value'                   => $value,'type'                    => $option['type']
            );                  
        }

        $product_data[] = array(
            'product_id' => $product['product_id'],'name'       => $product['name'],'model'      => $product['model'],'option'     => $option_data,'download'   => $product['download'],'quantity'   => $product['quantity'],'subtract'   => $product['subtract'],'price'      => $product['price'],'total'      => $product['total'],'tax'        => $this->tax->getTax($product['price'],$product['tax_class_id']),'reward'     => $product['reward']
        ); 
    }

    $data['products'] = $product_data;

然后在checout / checkout.tpl中添加一行：

foreach ($products as $product)
    {
        echo 'yes am getting products details';
    }

但仍然得到错误：未定义的变量：产品？

我做得对吗？请纠正我.