如何根据购物车中的哪些产品以及与这些产品相关联的运输选项从购物车中删除运送选项

Question

我有一个市场，卖家可以单独销售多种产品并指定运输选项，将运输选项与多对多关系中的产品联系起来。

在购物车控制器中，我正在尝试智能地删除运输选项，以便卖家不会因运费而花费太少。

例如，考虑一个包含两种产品的购物车。卖家为每件产品选择了一种送货方式：

$products = array(
    array(
        'id' => 1,
        'name' => 'Lightweight widget',
        'shipping_option_ids' => array(
            1
        )
    ),
    array(
        'id' => 2,
        'name' => 'Heavyweight widget',
        'shipping_option_ids' => array(
            2
        )
    )
);

以下是两种送货方式：

$shipping_options = array(
    array(
        'id' => 1,
        'name' => 'Cheap shipping option',
        'price' => 100
    ),
    array(
        'id' => 2,
        'name' => 'Expensive shipping option',
        'price' => 200
    )
);

因此，我们有两种产品，每种产品都链接到不同的运输选项。使用昂贵的运输选项，两种产品都可以在同一个包装中运输。

现在，我需要从送货选项数组中删除便宜的送货选项。这将使客户只选择一种选择 - 昂贵的选择。

概括

条件

• 购物车中的两个或多个产品没有至少一个共同的运输选项。

  动作

• 删除所有运费选项，但使用最昂贵的运送选项链接到产品的选项除外。

Answer 1

我通过以下方式解决了问题：

// Prepare for removal procedure
foreach ($store['shipping_options'] as &$shipping_option)
{
    $shipping_option['removal_candidate'] = FALSE;
}
unset($shipping_option);

// Label shipping options that aren't linked to all products:
foreach ($products as $product)
{
    if (!in_array($shipping_option['id'], $product['shipping_option_ids']))
    {
        $shipping_option['removal_candidate'] = TRUE;
    }
}

$number_of_shipping_options = count($shipping_options);

// Loop through each shipping option:
for ($i = 0; $i < $number_of_shipping_options; $i++)
{
    $shipping_option_a = $shipping_options[$i];

    // Compare each shipping option with each of the other shipping options:
    foreach ($shipping_options as $key => $shipping_option_b)
    {
        // Compare different shipping options only:
        if ($shipping_option_a['id'] != $shipping_option_b['id'])
        {
            // Remove the shipping option with the lowest price:
            if ($shipping_option_a['price'] < $shipping_option_b['price'])
            {
                if ($shipping_option_a['removal_candidate'])
                {
                    unset($store['shipping_options'][$i]);
                    $shipping_options_removed = TRUE;
                    $number_of_shipping_options = count($store['shipping_options']);
                }
                elseif ($shipping_option_a['price'] > $shipping_option_b['price'])
                {
                    if ($shipping_option_b['removal_candidate'])
                    {
                        unset($store['shipping_options'][$key]);
                        $shipping_options_removed = TRUE;
                        $number_of_shipping_options = count($store['shipping_options']);
                    }
                }
            }
        }
    }
    // Refresh key numbers:
    $store['shipping_options'] = array_values($store['shipping_options']);
}