UPDATE COMPATIBILITY for WooCommerce version 3+

由于WooCommerce 3,get_variation_description()现已弃用,并被WC_Product方法get_description()取代.

To get your product item variation description in cart (filtering variation product type condition),you have 2 possibilities (may be even more…):

>使用woocommerce_cart_item_name钩子显示变体描述,无需编辑任何模板.
>使用cart.PHP模板显示变体描述.

In both cases you don’t need to use in your code a foreach loop,as answered before,because it already exist. So the code will be more compact.

案例1 – 使用woocommerce_cart_item_name钩子：

add_filter( 'woocommerce_cart_item_name','cart_variation_description',20,3);
function cart_variation_description( $name,$cart_item,$cart_item_key ) {
    // Get the corresponding WC_Product
    $product_item = $cart_item['data'];

    if(!empty($product_item) && $product_item->is_type( 'variation' ) ) {
        // WC 3+ compatibility
        $descrition = version_compare( WC_VERSION,'3.0','<' ) ? $product_item->get_variation_description() : $product_item->get_description();
        $result = __( 'Description: ','woocommerce' ) . $descrition;
        return $name . '<br>' . $result;
    } else
        return $name;
}

在这种情况下,描述仅显示在标题和变体属性值之间.

此代码位于活动子主题(或主题)的function.PHP文件中,或者也可以放在任何插件文件中.

案例2 – 使用cart / cart.PHP模板(根据您的评论更新).

您可以选择要显示此说明的位置(2个选项)：

>标题后
>标题和变体属性值之后.

因此,您将根据您的选择在第86行或第90行的cart.PHP模板上插入此代码：

// Get the WC_Product
$product_item = $cart_item['data'];

if( ! empty( $product_item ) && $product_item->is_type( 'variation' ) ) {
    // WC 3+ compatibility
    $description = version_compare( WC_VERSION,'<' ) ? $product_item->get_variation_description() : $product_item->get_description();
    if( ! empty( $description ) ) {
        // '<br>'. could be added optionally if needed
        echo  __( 'Description: ','woocommerce' ) . $description;;
    }
}

所有代码都经过测试,功能齐全