Fusonic\Linq\Linq::getFirst PHP Method

    private function getFirst($func, $throw)
    {
        $source = $this->getWhereIteratorOrInnerIterator($func);
        $count = 0;
        $first = null;
        foreach ($source as $stored) {
            $count++;
            $first = $stored;
            break;
        }
        if ($count == 0 && $throw) {
            throw new \RuntimeException("The input sequence contains no matching element.");
        }
        return $first;
    }