WooCommerce 製品バリエーションのドロップダウンで在庫状況を表示するにはどうすればよいですか?

<code class="php">// Function that checks stock status and adds text to the dropdown option
function get_stock_status_text($product, $name, $term_slug) {
    foreach ($product->get_available_variations() as $variation) {
        if ($variation['attributes'][$name] == $term_slug) {
            $stock = $variation['is_in_stock'];
            break;
        }
    }
    return $stock == 1 ? ' - (In Stock)' : ' - (Out of Stock)';
}

// Function that filters the dropdown options and adds stock status
add_filter('woocommerce_dropdown_variation_attribute_options_html', 'show_stock_status_in_dropdown', 10, 2);
function show_stock_status_in_dropdown($html, $args) {
    // Only for products with one variation attribute (one dropdown)
    if (sizeof($args['product']->get_variation_attributes()) == 1) {
        $options = $args['options'];
        $product = $args['product'];
        $attribute = $args['attribute'];
        $name = $args['name'] ? $args['name'] : 'attribute_' . sanitize_title($attribute);
        $id = $args['id'] ? $args['id'] : sanitize_title($attribute);
        $class = $args['class'];
        $show_option_none = $args['show_option_none'] ? true : false;
        $show_option_none_text = $args['show_option_none'] ? $args['show_option_none'] : __('Choose an option', 'woocommerce');

        if (empty($options) && !empty($product) && !empty($attribute)) {
            $attributes = $product->get_variation_attributes();
            $options = $attributes[$attribute];
        }

        $html = '<select id="' . esc_attr($id) . '" class="' . esc_attr($class) . '" name="' . esc_attr($name) . '" data-attribute_name="attribute_' . esc_attr(sanitize_title($attribute)) . '" data-show_option_none="' . ($show_option_none ? 'yes' : 'no') . '">';
        $html .= '<option value="">' . esc_html($show_option_none_text) . '</option>';

        if (!empty($options)) {
            if ($product && taxonomy_exists($attribute)) {
                $terms = wc_get_product_terms($product->get_id(), $attribute, array('fields' => 'all'));

                foreach ($terms as $term) {
                    if (in_array($term->slug, $options)) {
                        $stock_status = get_stock_status_text($product, $name, $term->slug);
                        $html .= '<option value="' . esc_attr($term->slug) . '" ' . selected(sanitize_title($args['selected']), $term->slug, false) . '>' . esc_html(apply_filters('woocommerce_variation_option_name', $term->name) . $stock_status) . '</option>';
                    }
                }
            } else {
                foreach ($options as $option) {
                    $selected = sanitize_title($args['selected']) === $args['selected'] ? selected($args['selected'], sanitize_title($option), false) : selected($args['selected'], $option, false);
                    $stock_status = get_stock_status_text($product, $name, $option);
                    $html .= '<option value="' . esc_attr($option) . '"' . $selected . '>' . esc_html(apply_filters('woocommerce_variation_option_name', $option) . $stock_status) . '</option>';
                }
            }
        }
        $html .= '</select>';
    }

    return $html;
}</code>