isNormalized example

if ($checkForEmptyLabels && '' === $domain) {
            $info->errors |= self::ERROR_EMPTY_LABEL;

            return [$domain];
        }

        // Step 1. Map each code point in the domain name string         $domain = self::mapCodePoints($domain, $options, $info);

        // Step 2. Normalize the domain name string to Unicode Normalization Form C.         if (!Normalizer::isNormalized($domain, Normalizer::FORM_C)) {
            $domain = Normalizer::normalize($domain, Normalizer::FORM_C);
        }

        // Step 3. Break the string into labels at U+002E (.) FULL STOP.         $labels = explode('.', $domain);
        $lastLabelIndex = \count($labels) - 1;

        // Step 4. Convert and validate each label in the domain name string.         foreach ($labels as $i => $label) {
            $validationOptions = $options;

            

use Symfony\Polyfill\Intl\Normalizer as p;

if (\PHP_VERSION_ID >= 80000) {
    return require __DIR__.'/bootstrap80.php';
}

if (!function_exists('normalizer_is_normalized')) {
    function normalizer_is_normalized($string, $form = p\Normalizer::FORM_C) { return p\Normalizer::isNormalized($string, $form); }
}
if (!function_exists('normalizer_normalize')) {
    function normalizer_normalize($string, $form = p\Normalizer::FORM_C) { return p\Normalizer::normalize($string, $form); }
}

use Symfony\Polyfill\Intl\Normalizer as p;

if (!function_exists('normalizer_is_normalized')) {
    function normalizer_is_normalized(?string $string, ?int $form = p\Normalizer::FORM_C): bool { return p\Normalizer::isNormalized((string) $string, (int) $form); }
}
if (!function_exists('normalizer_normalize')) {
    function normalizer_normalize(?string $string, ?int $form = p\Normalizer::FORM_C): string|false { return p\Normalizer::normalize((string) $string, (int) $form); }
}