woocommerce挂钩添加到购物车按钮并保存自定义字段

function add_custom_field_to_cart_button() {
    // 获取自定义字段的值
    $custom_field_value = isset($_POST['custom_field']) ? sanitize_text_field($_POST['custom_field']) : '';

    // 添加自定义字段到购物车按钮
    echo '<input type="hidden" name="custom_field" value="' . $custom_field_value . '">';

    // 保存自定义字段到会话中
    WC()->session->set('custom_field', $custom_field_value);
}
add_action('woocommerce_before_add_to_cart_button', 'add_custom_field_to_cart_button');

<form class="cart" method="post" enctype="multipart/form-data">
    <!-- 添加其他产品选项 -->
    <input type="text" name="custom_field" placeholder="自定义字段">
    <button type="submit" class="single_add_to_cart_button button alt">添加到购物车</button>
</form>