KGzocha\Searcher\AbstractCollection::isTraversable PHP Method

    private function isTraversable($items)
    {
        if (is_array($items)) {
            return;
        }
        if ($items instanceof \Traversable) {
            return;
        }
        throw new \InvalidArgumentException(sprintf('Argument passed to collection %s needs to be an array or traversable object', get_class($this)));
    }