How to specify an exception for a category in a php script?

Question

WordPress

Hello!

The code:

add_filter('woocommerce_add_to_cart_validation', 'check_and_limit_cart_items', 10, 3);

function check_and_limit_cart_items ($passed, $product_id, $quantity) {
  $category = 'subscriptions';
  // Если корзина пуста
  if ( WC()->cart->is_empty() )
    return $passed;
  // Поиск товаров из категории подписок
  foreach (WC()->cart->get_cart() as $cart_item) {
    if ( has_term($category, 'product_cat', $cart_item['product_id']) ) {
      // Показать сообщение
      wc_add_notice(__('A subscription is already in cart (Other items are not allowed in cart).', 'woocommerce' ), 'error');
      // Не добавляем новые товары
      return false;
    }
  }
  return $passed;
}

I can't figure out how to add an exception for products from the category with the subscriptions slug. So that from there you can add

Help, please, figure it out, since the night I have been trying different options with the line:

foreach (WC()->cart->get_cart() as $cart_item) {
if ( has_term($category, 'product_cat', $cart_item['product_id']) ) {
// Show message
wc_add_notice(__('A subscription is already in cart (Other items are not allowed in cart).', 'woocommerce' ), 'error');
// Don't add new products
return false;
}

and nothing comes out

Answer 1

Hello.
Firstly,
>> Help me, please, to figure it out, since the night I have been trying different options with the string:
Strings , not a string.
Secondly, "string" has nothing to do with it.

// Запрет на добавление в корзину товаров из категории подписок,
// если уже есть товар из категории подписок в корзине
add_filter('woocommerce_add_to_cart_validation', 'for_subscriptions_limit_cart_items', 10, 3);

function for_subscriptions_limit_cart_items ($passed, $product_id, $quantity) {

  $subscription_category = 'subscriptions';
  // Если корзина пуста
  if ( WC()->cart->is_empty() ) {
    return $passed;
  }

  $subscription_in_cart = false;

  // Поиск товаров из категории подписок в корзине
  foreach (WC()->cart->get_cart() as $cart_item) {
    if ( has_term($subscription_category, 'product_cat', $cart_item['product_id']) ) {
      $subscription_in_cart = true;
    }
  }

  if ($subscription_in_cart) {
    // проверяем, что новый товар тоже из категории подписок
    if ( has_term($subscription_category, 'product_cat', $product_id) ) {
      // добавляем товар в корзину
      return $passed;

    // если новый товар не из категории подписок
  } else {
    // Показать сообщение
    wc_add_notice(__('A subscription is already in cart (Other items are not allowed in cart).', 'woocommerce' ), 'error');
    // Не добавляем новые товары
    return false;
    }
  }
  return $passed;
}

And the third :) If I'm not mistaken, I continued the thought of your old question, which you deleted: Separate payment for goods or another "buy in one click" - how?
The idea intrigued me. Anatoly suggested a solution to me there, take a look, if anything.
If I made a mistake and this is not your idea, I continued - sorry, misunderstood.

Answer 2

Why has_term is used, it also looks for tags and tags in publications but not in the object in the basket. Inside the loop, you will most likely have to make another loop to parse the product object, can you see what you get in the loop itself? Add a print to the loop
print_r($cart_item['product_id']);