Pinq\Iterators\Standard\ArrayIteratorAdapter::doFetch PHP Метод

    protected function doFetch()
    {
        $arrayIterator = $this->iterator;
        if ($arrayIterator->valid()) {
            $key = $arrayIterator->key();
            //Get value by ref
            $element = [$key, &$arrayIterator[$key]];
            $arrayIterator->next();
            return $element;
        }
    }