如何防止单个购物车中只有 2 个可下载产品？

Question

这是代码

add_filter( 'woocommerce_add_to_cart_validation', 'only_one_product_type_allowed', 10, 3 );
function only_one_product_type_allowed( $passed, $product_id, $quantity ) {

  $product = wc_get_product( $product_id );
  $product_type = $product->get_type();
  $product_downloadable = $product->is_downloadable();

  foreach ( WC()->cart->get_cart() as $cart_item ) {

    if ( $product_type == $cart_item['data']->get_type() && $product_downloadable == $cart_item['data']->is_downloadable() && ! $product->is_virtual() ) {

      wc_add_notice( __( "NOTICE ON CART PAGE.", "woocommerce" ), 'error' );

      return false;
    }
  }

  return $passed;
  
}

现在，单个购物车中不允许有多个可下载产品，这是可以的。但购物车中也不允许有超过一件常规商品。它发出了同样的通知。任何人都可以帮忙修复吗？

Answer 1

要在购物车中仅允许一种可下载产品，而允许其他产品种类，请尝试使用以下内容：

add_filter( 'woocommerce_add_to_cart_validation', 'only_one_downloadable_product_allowed', 10, 4 );
function only_one_downloadable_product_allowed( $passed, $product_id, $quantity, $variation_id = null ) {
    // Get the current product object
    $product  = wc_get_product( $variation_id > 0 ? $variation_id : $product_id );

    // Initializing downloadable product count
    $count_dl = $product->is_downloadable() ? 1 : 0; 

    // Loop through cart items
    foreach ( WC()->cart->get_cart() as $item ) {
        // Check for downloadable products in cart
        if ( $item['data']->is_downloadable() ) {
            $count_dl++;
        }
    }

    if ( $count_dl > 1 ) {
        wc_add_notice( __( "Only one downloadable product is allowed at the time.", "woocommerce" ), 'error' );
        $passed = false;
    }
    return $passed;
}

代码位于子主题的functions.php 文件中（或插件中）。应该可以。