Supported Versions: PHP 5 >= 5.3.0, PHP 7, PHP 8, PECL intl >= 1.0.2, PECL idn >= 0.1
Convert domain name to IDNA ASCII form
<?php idn_to_ascii( string $domain, int $flags = IDNA_DEFAULT, int $variant = INTL_IDNA_VARIANT_UTS46, array &$idna_info = null): string|false