WooCommerce 上的购物车总重量和运输重新计算

我正在尝试使用一个片段将我的自定义盒子重量添加到总订单重量中，目前工作正常。但是，不会根据重新计算的片段重量重新计算运输方式。有什么想法如何强制重新计算运费吗？

 add_filter( 'woocommerce_cart_contents_weight', 'filter_wc_cart_contents_weight', 10000 );
function filter_wc_cart_contents_weight( $weight ) {
    //box testing sizes (kg)
    $Envelope = 2;
    $Small_parcel = 10;
    $Medium_parcel = 50;

    // Loop through cart items
    foreach(WC()->cart->get_cart() as $cart_item ) {
        $total_height += $cart_item['data']->get_height() * $cart_item['quantity'];
        }
    if( $total_height <= 8)  {
            $weight += $Envelope;
    }
    if( $total_height >= 8 && $total_height <=61)  {
            $weight += $Small_parcel;
    }
    return $weight;
}


//show calculated weight at checkout

add_action( 'woocommerce_cart_totals_after_order_total', 'display_wc_cart_total_weight_after_order_total' );
function display_wc_cart_total_weight_after_order_total() {
    ?>
    <tr class="order-total">
        <th><?php esc_html_e( 'Total weight', 'woocommerce' ); ?></th>
        <td data-title="<?php esc_attr_e( 'Total weight', 'woocommerce' ); ?>"><?php echo wc_format_weight( WC()->cart->get_cart_contents_weight() ); ?></td>
    </tr>
    <?php
}

以下方法允许在结帐时添加包裹的重量，方法是将要使用的包裹的重量除以购物车物品。这样，购物车总重量也包括箱子重量，并且运输选项可以反映实际订单总重量的正确价格。

    add_action( 'woocommerce_before_calculate_totals', 'add_custom_weight', 10, 1 );
    
    function add_custom_weight( $cart ) {
        
        if ( is_admin() && ! defined( 'DOING_AJAX' ) )
            return;
        if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
            return;
        
        //box sizes (kg)
        $Small_envelope = 0.095;
        $Medium_envelope = 0.11;
        $Large_envelope = 0.2;
        $Small_box = 0.4;
        $Medium_box = 0.6;
        
// 

循环浏览购物车商品并获取订单中商品的总高度和最大宽度，以进行额外检查以应用适当的框（如果需要）

        foreach(WC()->cart->get_cart() as $cart_item ) {
                $total_height += $cart_item['data']->get_height() * $cart_item['quantity'];
                $temp_width = $cart_item['data']->get_width();
                if ($temp_width > $max_width){
                    $max_width = $temp_width;                   }
            $cart_items_qty += $cart_item['quantity'];
        }
        
    //Check which box should be used based on total order height
        if( $total_height <= 2.7 && $max_width < 19)  {
                $extra_weight = $Small_envelope; 
            } 
        if( $total_height > 2.7 && $total_height <=8 && $max_width < 19)  {
                $extra_weight = $Medium_envelope;
            }
        if( $total_height > 8 && $total_height <=16 && $max_width < 19)  {
                $extra_weight = $Large_envelope;
            }
        if( $total_height > 16 && $total_height <=22)  {
                $extra_weight = $Small_box;
            }
        if( $total_height > 22 && $total_height <=38)  {
                $extra_weight = $Medium_box;
            }
        
        
    //

将 $extra_weight（盒子重量）除以购物车商品数量。然后再次循环浏览购物车商品，将划分后的重量添加到每个商品中。

$xtr_weight_per_item = $extra_weight / $cart_items_qty;
            foreach ( $cart->get_cart() as $cart_item ) {
                $cart_item['data']->set_weight( $cart_item['data']->get_weight()+$xtr_weight_per_item);
            }
        }
    //

结账时显示计算重量以进行测试

    add_action( 'woocommerce_cart_totals_after_order_total', 'display_wc_cart_total_weight_after_order_total' );
    function display_wc_cart_total_weight_after_order_total() {
        ?>
        <tr class="order-total">
            <th><?php esc_html_e( 'Total weight', 'woocommerce' ); ?></th>
            <td data-title="<?php esc_attr_e( 'Total weight', 'woocommerce' ); ?>"><?php echo wc_format_weight( WC()->cart->get_cart_contents_weight() ); ?></td>
        </tr>
        <?php
    }