Prose\FromEc2Instance::getPublicDnsName PHP Method

    public function getPublicDnsName()
    {
        // make sure we have a host to work with
        $this->requiresValidHost(__METHOD__);
        // what are we doing?
        $log = usingLog()->startAction("get the public DNS name for EC2 VM '{$this->instanceName}'");
        // here are the details, as a string
        $dnsName = $this->instance['PublicDnsName'];
        // does it *have* a public DNS name?
        if (empty($dnsName)) {
            $log->endAction("EC2 VM does not have a public DNS name; has it finished booting?");
            return null;
        }
        // all done
        $log->endAction("public DNS name is: '{$dnsName}'");
        return $dnsName;
    }