If you type
nslookup -type=SRV _xmpp-server._tcp.gmail.com
(or use the dig command in OSX) you get some SRV records relating to google chat
You could use Pear Net_DNS. I managed to get this to work on Linux, but haven't tested it on Windows or any others:
require_once('Net/DNS.php');
$resolver = new Net_DNS_Resolver();
$response = $resolver->query('_xmpp-server._tcp.gmail.com', 'SRV');
if ($response) {
foreach ($response->answer as $rr) {
$rr->display();
}
}
I modified the example from their documentation. hope this helps
There is dns_get_record(). According to the docs it can take an int $type
argument, which refers to a set of constants, one of them being DNS_SRV
.