Php 如果已购买产品，则将商品价格设置为零

我无法推翻第二次购买的价格

用例是：如果用户已经购买了产品“944”，那么下次订单的价格将是0

也就是说，客户只需为该特定产品的第一次订单付款，而下一次订单则是免费的

这是我的代码：

 // Enter the ID of the product that shouldn't be purchased again
    $no_repeats_id = 944;
    $no_repeats_product = wc_get_product( $no_repeats_id );

    // Get the current product to check if purchasing should be disabled
    global $product;

    if ( $no_repeats_product->is_type( 'variation' ) ) {
        // Bail if we're not looking at the product page for the non-purchasable product
        if ( ! $no_repeats_product->parent->id === $product->id ) {
            return;
        }

        // Render the purchase restricted message if we are
        if ( wc_customer_bought_product( wp_get_current_user()->user_email, get_current_user_id(), $no_repeats_id ) ) {
            sv_render_variation_non_purchasable_message( $product, $no_repeats_id );
        }

    } elseif ( $no_repeats_id === $product->id ) {
        if ( wc_customer_bought_product( wp_get_current_user()->user_email, get_current_user_id(), $no_repeats_id ) ) {
            // Create your message for the customer here
            add_action( 'woocommerce_before_calculate_totals', 'add_custom_price' );

add_action( 'woocommerce_before_calculate_totals', 'add_custom_price' );

function add_custom_price( $cart_object ) {
    $custom_price = 10; // This will be your custome price  
    $target_product_id = 944;
    foreach ( $cart_object->cart_contents as $value ) {
        if ( $value['product_id'] == $target_product_id ) {
            $value['data']->price = $custom_price;
        }
        /*
        // If your target product is a variation
        if ( $value['variation_id'] == $target_product_id ) {
            $value['data']->price = $custom_price;
        }
        */
    }
}

        }
    }
}
add_action( 'woocommerce_single_product_summary', 'sv_purchase_disabled_message', 31 );

---

以下是使其在woocommerce 3+中工作的方法：

add_action( 'woocommerce_before_calculate_totals', 'conditionally_change_cart_items_price', 10, 1 );
function conditionally_change_cart_items_price( $cart_object ) {

    if ( is_admin() && ! defined( 'DOING_AJAX' ) )
        return;

    if ( did_action( 'woocommerce_before_calculate_totals' ) >= 2 )
        return;

    // Set Here your targeted product ID
    $targeted_product_id = 944;

    // Set Here your custom price (1st purshase)
    $custom_price = 10; // First purshase for product ID 944

    // Detecting if customer has already bought The targeted product (944)
    if( is_user_logged_in() ){
        $customer      = wp_get_current_user();
        $customer_id   = $customer->ID; // customer ID
        $customer_email = $customer->email; // customer email

        if( wc_customer_bought_product( $customer_email, $customer_id, $targeted_product_id) )
            $custom_price = 0; // Set to 0 for other purchases (product ID 944)
    }

    foreach ( $cart_object->get_cart() as $cart_item ) {
        // When targeted product is in cart we change the price
        if ( $cart_item['product_id'] == $targeted_product_id ) {
            // Woocommerce 3+ compatibility
            if ( version_compare( WC_VERSION, '3.0', '<' ) )
                $cart_item['data']->price = $custom_price;
            else
                $cart_item['data']->set_price( $custom_price );
        }
    }
}

add\u action（'woocommerce\u before\u calculate\u totals'，'conditionally\u change\u cart\u items\u price'，10,1）；
函数有条件地\u更改\u购物车\u项目\u价格（$cart\u对象）{
if（定义了（'DOING'uajax'））
返回；
如果（did_action（'woocommerce_before_calculate_totals'）>=2）
返回；
//在此设置您的目标产品ID
$targeted_product_id=944；
//在此设置您的自定义价格（第一次购买）
$custom_price=10；//首次购买产品ID 944
//检测客户是否已购买目标产品（944）
如果（用户是否已登录）{
$customer=wp_get_current_user（）；
$customer\u id=$customer->id；//客户id
$customer\u email=$customer->email；//客户电子邮件
if（wc_客户_购买的_产品（$customer_email、$customer_id、$targeted_product_id））
$custom_price=0；//对于其他购买（产品ID 944）设置为0
}
foreach（$cart\u object->get\u cart（）作为$cart\u项目）{
//当目标产品在购物车中时，我们会更改价格
if（$cart\u item['product\u id']==$targeted\u product\u id）{
//Woocommerce 3+兼容性
if（版本比较（WC_版本，'3.0'，它不起作用。if（！WC_客户_购买的产品（$customer_email，$customer_id，$targeted_product_id））需要是if（WC_客户_购买的产品（$customer_email，$customer_id，$targeted_product_id））没有！@MujtabaK Updated抱歉，我忘了删除在进行测试时添加的
！
，但此代码有效…如果我从特定类别中选择5种产品，购物车中的所有产品都要收取100美元的费用。我想将第一次订单的费用限制为100美元，而不是500美元，然后下一次订单的费用为0.00美元。@MujtabaK wc_customer_bunded\u prproduct（）函数不适用于产品类别，仅适用于产品ID