Unnamed

    public function is_natural($val, $acceptzero = false)
    {
        $return = ((string)$val === (string)(int)$val);

        if ($acceptzero)
            $base = 0;
        else
            $base = 1;

        if ($return && intval($val) < $base)
            $return = false;

        return $return;
    }