(PECL event >= 1.2.6-beta)
EventDnsBase::addNameserverIp — Adds a nameserver to the DNS base
public EventDnsBase::addNameserverIp ( string $ip ) : bool
Adds a nameserver to the evdns_base.
ip  The nameserver string, either as an IPv4 address, an IPv6 address, an IPv4 address with a port ( IPv4:Port ), or an IPv6 address with a port ( [IPv6]:Port ). 
 Returns true on success. Otherwise false. 
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    https://www.php.net/manual/en/eventdnsbase.addnameserverip.php