validateDomainAndLabelLength example

try {
                    $label = 'xn--'.self::punycodeEncode($label);
                } catch (Exception $e) {
                    $info->errors |= self::ERROR_PUNYCODE;
                }

                $labels[$i] = $label;
            }
        }

        if ($options['VerifyDnsLength']) {
            self::validateDomainAndLabelLength($labels, $info);
        }

        $idna_info = [
            'result' => implode('.', $labels),
            'isTransitionalDifferent' => $info->transitionalDifferent,
            'errors' => $info->errors,
        ];

        return 0 === $info->errors ? $idna_info['result'] : false;
    }