src/Primitive/Container/Container.php
protected function uniqueRecursive($items)
    {
        foreach ($items as $key => $item)
        {
            if ($this->isArrayable($item))
            {
                $this->items[$key] = $this->uniqueRecursive($this->retrieveValue($item));
            }
        }

        return array_unique($this->items);
    }
protected function uniqueRecursive($items)
    {
        foreach ($items as $key => $item)
        {
            if ($this->isArrayable($item))
            {
                $this->items[$key] = $this->uniqueRecursive($this->retrieveValue($item));
            }
        }

        return array_unique($this->items);
    }
Unique items recursively.

@param $items
@return array