我想根据WooCommerce中的购物车金额添加特定的免费礼物。

• 80以下无产品赠品
• 80以上120以下加赠1份
• 120多加赠1赠2

基于WooCommerce答案代码中的最小购物车金额添加免费礼品产品，如果我添加1个元素，它会工作，但如果我添加礼物2，它会停止工作。
其他问题：
1.刷新购物车时，礼品1和礼品2的产品数量增加到2、3、4等，而不是保持为1，并且不更改小计。
1.显示的礼品小计不等于零
这是我的代码尝试：

function action_woocommerce_before_calculate_totals( $cart ) {
    if ( is_admin() && ! defined( 'DOING_AJAX' ) ) {
        return;
    }

    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 ) {
        return;
    }

    // Free product productIDs
    $free_product_id_1 = gift1;
    $free_product_id_2 = gift2;

    // Minimum subtotal needed for free products
    $min_subtotal_free_product_1 = 80;
    $min_subtotal_free_product_2 = 120;

    // Initializing
    $cart_subtotal = 0;

    // Loop through cart items
    foreach ( $cart->get_cart() as $cart_item_key => $cart_item ) {
        // When free product is is cart
        if ( $free_product_id_1 == $cart_item['gift1'] ) {
            $free_key_1 = $cart_item_key;
            $free_qty_1 = $cart_item['1'];
            // Optionally set the price to zero
            $cart_item['6215']->set_price( 0 );
        } elseif ( $free_product_id_2 == $cart_item['gift2'] ) {
            $free_key_2 = $cart_item_key;
            $free_qty_2 = $cart_item['1'];
            // Optionally set the price to zero
            $cart_item['7912']->set_price( 0 );
        } else {
            // NOT empty
            if ( ! empty( $cart_item['line_total'] ) ) {
                $cart_subtotal += $cart_item['line_total'];
            }

            // NOT empty
            if ( ! empty( $cart_item['line_tax'] ) ) {
                $cart_subtotal += $cart_item['line_tax'];
            }
        }
    }
    // If subtotal is less than first subtotal
    if ( $cart_subtotal < $min_subtotal_free_product_1 ) {
        // Free product 1 is already in cart, remove it
        if ( isset( $free_key_1 ) ) {
            $cart->remove_cart_item( $free_key_1 );
        }

        // Free product 2 is already in cart, remove it
        if ( isset( $free_key_2 ) ) {
            $cart->remove_cart_item( $free_key_2 );
        }
    }
    // If subtotal is between first and second subtotal
    elseif ( $cart_subtotal >= $min_subtotal_free_product_1 && $cart_subtotal < $min_subtotal_free_product_2 ) {
        // Free product 1 is not already in cart, add it
        if ( ! isset( $free_key_1 ) ) {
            $cart->add_to_cart( $free_product_id_1 );
        }

        // Free product 2 is in cart, remove it
        if ( isset( $free_key_2 ) ) {
            $cart->remove_cart_item( $free_key_2 );
        }
    }
    // If subtotal greater than or equal to second subtotal
    elseif ( $cart_subtotal > $min_subtotal_free_product_2 ) {
        // Free product 1 is already in cart, remove it
        if ( isset( $free_key_1 ) ) {
            $cart->remove_cart_item( $free_key_1 );
        }

        // Free product 2 is not already in cart, add it
        if ( ! isset( $free_key_2 ) ) {
            $cart->add_to_cart( $free_product_id_2 );
        }
    }

    // Keep free product 1 quantity to 1.
    if ( isset( $free_qty_1 ) && $free_qty_1 > 1 ) {
        $cart->set_quantity( $free_key_1, 1 );
    }

    // Keep free product 2 quantity to 1.
    if ( isset( $free_qty_2 ) && $free_qty_2 > 1 ) {
        $cart->set_quantity( $free_key_2, 1 );
    }
}
add_action( 'woocommerce_before_calculate_totals', 'action_woocommerce_before_calculate_totals', 10, 1 );

谢啦，谢啦