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Подсчет суммы товаров которых нет в наличии (в корзине)

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Нужно подсчитать сумму всех товаров находящихся в корзине, которые имеют отметку *** (которых нет в наличии)

в файлe catalog/controller/checkout/cart.php

if (!$product['stock']) {
 if (($this->config->get('config_customer_price') && $this->customer->isLogged()) || !$this->config->get('config_customer_price')) {
	  $totalstock = $this->currency->format($this->tax->calculate($product['price'], $product['tax_class_id'], $this->config->get('config_tax')) * $product['quantity']);
 } else {
	  $totalstock = false;
} else {
 $totalstock = false;

// в конец массива добавил 'totalstock'	=> $totalstock
$this->data['products'][] = array(
'totalstock'	=> $totalstock

подсчитал сумму для каждого продукта которого нет в наличии

Как теперь сложить их и записать в другую переменную?

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