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您好，当购物车中产品的总和（还必须包括运费）大于变量的值（$minimum_cart_total = 77.47;）时，我试图在结帐中插入费用，其中之一产品属于特定类别。

该功能部分工作，但它不会自动计算根据购物车总和修改的运费。

你能帮助我吗？

function woo_add_cart_fee() {
    $shipping_tax_amount = WC() - > cart - > cart_shipping_total;
    $category_ID = '220';
    $minimum_cart_total = 77.47;
    $cart_total = WC() - > cart - > cart_contents_total;
    $field_id = 'wholesale_checkbox';
    $cart_total_ship = $cart_total + $shipping_tax_amount;
    global $woocommerce;
    foreach($woocommerce - > cart - > cart_contents as $key => $values) { 
      // Get the terms, i.e. category list using the ID of the product
      $terms=get_the_terms( $values['product_id'], 'product_cat' ); 
      // Because a product can have multiple categories, we need to iterate through the list of the products category for a match 
      foreach ($terms as $term){
        // 220 is the ID of the category for which we want to remove the payment gateway 
        if($term->term_id==$category_ID && $cart_total_ship > $minimum_cart_total )
        {$excost=2;}}
        $woocommerce->cart->add_fee('Other fee', $excost, $taxable=false, $tax_class='');}}

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