Woocommerce基于条件逻辑在购物车/结帐处显示消息

Question

我目前发现以下代码，显示了启用免费送货前的可用支出金额。我需要扩展逻辑，以使其仅显示国家/地区代码为GB，并且装运类别（弹头）是否等于包裹力量和/或小包裹。我需要添加什么？

function my_custom_wc_free_shipping_notice() {
    if ( ! is_cart() && ! is_checkout() ) { // Remove partial if you don't want to show it on cart/checkout
        return;
    }
    $packages = WC()->cart->get_shipping_packages();
    $package = reset( $packages );
    $zone = wc_get_shipping_zone( $package );
    $cart_total = WC()->cart->get_displayed_subtotal();
    if ( WC()->cart->display_prices_including_tax() ) {
        $cart_total = round( $cart_total - ( WC()->cart->get_discount_total() + WC()->cart->get_discount_tax() ), wc_get_price_decimals() );
    } else {
        $cart_total = round( $cart_total - WC()->cart->get_discount_total(), wc_get_price_decimals() );
    }
    foreach ( $zone->get_shipping_methods( true ) as $k => $method ) {
        $min_amount = $method->get_option( 'min_amount' );
        if ( $method->id == 'free_shipping' && ! empty( $min_amount ) && $cart_total < $min_amount ) {
            $remaining = $min_amount - $cart_total;
            wc_add_notice( sprintf( 'Add %s more to get free shipping!', wc_price( $remaining ) ) );
        }
    }
}
add_action( 'wp', 'my_custom_wc_free_shipping_notice' );