使用PHP为Woocommerce产品生成(schema)结构化SEO商品(Product)数据

默认的woocommerce缺少了产品的结构化数据，虽然yoast支持，但是属于Pro功能。

使用PHP简单实现这个功能，顺便增加商家资讯的结构化SEO数据.

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add_action('wp_head', 'add_product_structured_data');

function add_product_structured_data() {
    if (is_product()) {
        global $product;

        // 获取商品信息
        $product_id = get_the_ID();
        $product_title = get_the_title();
        $product_image = wp_get_attachment_url(get_post_thumbnail_id());
        $product_description = esc_js(strip_tags(get_the_excerpt()));
        $product_sku = $product->get_sku();
        $regular_price = $product->get_regular_price();
        $sale_price = $product->get_sale_price();

        // 获取商家信息，使用网站名称作为商家名称（如果有具体商家字段，可以修改这里）
        $seller_name = get_bloginfo('name'); // 网站名称作为商家名称
        $seller_url = home_url();  // 网站首页 URL 作为商家网址

        // 如果是变体商品，获取变体价格
        if ($product->is_type('variable')) {
            $variations = $product->get_available_variations();
            $structured_data = [
                "@context" => "https://schema.org/",
                "@type" => "Product",
                "name" => $product_title,
                "image" => [$product_image],
                "description" => $product_description,
                "sku" => $product_sku,
                "brand" => [
                    "@type" => "Brand",
                    "name" => $seller_name // 使用商家名称
                ],
                "offers" => [],
                "seller" => [
                    "@type" => "Organization", // 使用 Organization 类型表示商家
                    "name" => $seller_name,
                    "url" => $seller_url
                ]
            ];

            // 获取每个变体的价格
            foreach ($variations as $variation) {
                $variation_product = wc_get_product($variation['variation_id']);
                $variation_regular_price = $variation_product->get_regular_price();
                $variation_sale_price = $variation_product->get_sale_price();
                $variation_sku = $variation_product->get_sku();
                $variation_url = get_permalink($variation['variation_id']);
                $variation_availability = $variation_product->is_in_stock()
                    ? "https://schema.org/InStock"
                    : "https://schema.org/OutOfStock";

                // 如果变体有促销价格
                if (!empty($variation_sale_price)) {
                    $structured_data['offers'][] = [
                        "@type" => "Offer",
                        "url" => $variation_url,
                        "priceCurrency" => "HKD",
                        "price" => $variation_sale_price,  // 使用变体的促销价格
                        "availability" => $variation_availability,
                        "itemCondition" => "https://schema.org/NewCondition",
                        "description" => "特惠，原價{$variation_regular_price} HKD，現價{$variation_sale_price} HKD。"
                    ];
                } else {
                    // 如果没有促销价格，使用常规价格
                    $structured_data['offers'][] = [
                        "@type" => "Offer",
                        "url" => $variation_url,
                        "priceCurrency" => "HKD",
                        "price" => $variation_regular_price,  // 使用变体的常规价格
                        "availability" => $variation_availability,
                        "itemCondition" => "https://schema.org/NewCondition"
                    ];
                }
            }
        } else {
            // 如果是单一商品，处理常规价格或促销价格
            $structured_data = [
                "@context" => "https://schema.org/",
                "@type" => "Product",
                "name" => $product_title,
                "image" => [$product_image],
                "description" => $product_description,
                "sku" => $product_sku,
                "brand" => [
                    "@type" => "Brand",
                    "name" => $seller_name // 使用商家名称
                ],
                "offers" => [],
                "seller" => [
                    "@type" => "Organization", // 使用 Organization 类型表示商家
                    "name" => $seller_name,
                    "url" => $seller_url
                ]
            ];

            // 如果没有促销价格，只有常规价格
            if (!empty($sale_price)) {
                $structured_data['offers'][] = [
                    "@type" => "Offer",
                    "url" => get_permalink(),
                    "priceCurrency" => "HKD",
                    "price" => $sale_price,
                    "availability" => "https://schema.org/InStock",
                    "itemCondition" => "https://schema.org/NewCondition",
                    "description" => "特惠，原價{$regular_price} HKD，現價{$sale_price} HKD。"
                ];
            } else {
                // 如果没有促销价格，使用常规价格
                $structured_data['offers'][] = [
                    "@type" => "Offer",
                    "url" => get_permalink(),
                    "priceCurrency" => "HKD",
                    "price" => $regular_price,
                    "availability" => "https://schema.org/InStock",
                    "itemCondition" => "https://schema.org/NewCondition"
                ];
            }
        }

        // 输出结构化数据
        echo '<script type="application/ld+json">' . wp_json_encode($structured_data, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE) . '</script>';
    }
}