<?php
$domain = "thurdesk.ch";
$nameserverIP = "185.163.51.142";
$nameserverName = "ns1.thurdata.ch";

require_once 'Net/DNS2.php';

function cwp7CheckSOA($domain, $nameserverIP, $nameserverName ) {
	$nameserver = array($nameserverIP);
	$resolver = new Net_DNS2_Resolver(array('nameservers' => $nameserver));
    try {
            $result = $resolver->query($domain, 'NS');
            
    } catch(Net_DNS2_Exception $e) {
		return 'none';
    }
	return $result;
};

$result = cwp7CheckSOA($domain, $nameserverIP, $nameserverName );
print_r($result);