whmcsDNSManager/modules/addons/DNSManager2/models/custom/server/helpers/Formatter.php

<?php

namespace MGModule\DNSManager2\models\custom\server\helpers;

/**
 * Class Formatter
 *
 * @author Artur Pilch <artur.pi@modulesgarden.com>
 */
class Formatter
{
    public static function formatServersRecord($servers)
    {
        if(!$servers)
        {
            return null;
        }
        $exploded = explode(',', $servers);
        return implode(', ', $exploded);
    }
}