whmcsDNSManager/modules/addons/DNSManager2/mgLibs/custom/helpers/IdnaHelper.php

<?php

namespace MGModule\DNSManager2\mgLibs\custom\helpers;

use MGModule\DNSManager2\mgLibs\custom\dns\utils\IDNAConvert;

class IdnaHelper 
{
    public static function idnaDecode($domain) 
    {
        $idna = new IDNAConvert();
        return $idna->decode($domain);
    } 
    
    public static function idnaEncode($domain) 
    {
        $idna = new IDNAConvert();
        return $idna->encode($domain);
    }    
    
    public static function isDomainIdn($domainName)
    {
        if(stripos($domainName, 'xn--') === 0)
        {
            return true;
        }
        
        return false;
    }
}