QueryPath\DOMQuery::even PHP Метод

    public function even()
    {
        $found = new \SplObjectStorage();
        $even = false;
        foreach ($this->matches as $m) {
            if ($even && $m->nodeType == XML_ELEMENT_NODE) {
                $found->attach($m);
            }
            $even = $even ? false : true;
        }
        return $this->inst($found, null, $this->options);
    }