Pinq\Iterators\Standard\Iterator::fetch PHP Метод

    public final function fetch()
    {
        $this->requiresFirstFetch = false;
        if ($this->valid = null !== ($element = $this->doFetch())) {
            $this->key = $element[0];
            $this->value =& $element[1];
            return $element;
        }
    }