woocomerce :在状态完成后获取自定义产品输入字段的单个值

// Hook into the order status completed event
add_action('woocommerce_order_status_completed', 'get_custom_field_value');

function get_custom_field_value($order_id) {
    // Get the order object
    $order = wc_get_order($order_id);
    
    // Loop through order items
    foreach ($order->get_items() as $item_id => $item) {
        // Get the product ID
        $product_id = $item->get_product_id();
        
        // Get the custom field value
        $custom_field_value = get_post_meta($product_id, 'custom_field_name', true);
        
        // Do something with the custom field value
        echo 'Custom field value: ' . $custom_field_value;
    }
}