function createCartHash(&$cart)
{
if (!empty(OPCcache::$totalWeight)) {
return OPCcache::$totalWeight;
}
OPCcache::$totalWeight = 0;
$order_weight = 0;
$hash = '';
foreach ($cart->products as $product) {
$h = serialize($product);
$md5 = $h;
$hash[$md5] = 1;
$order_weight += $product->product_weight * $product->quantity;
}
OPCcache::$cartHash = md5(serialize($hash));
OPCcache::$totalWeight = $order_weight;
}
