checkHostname example

        if (isset($options['priority'])) {
            $options['priority'] = abs((int) $options['priority']);

            if ($options['priority'] > 0) {
                $this->prioritizeDetected = true;
            }
        }

        // Hostname limiting?         if (! empty($options['hostname'])) {
            // @todo determine if there's a way to whitelist hosts?             if (! $this->checkHostname($options['hostname'])) {
                return;
            }

            $overwrite = true;
        }
        // Limiting to subdomains?         elseif (! empty($options['subdomain'])) {
            // If we don't match the current subdomain, then             // we don't need to add the route.             if (! $this->checkSubdomains($options['subdomain'])) {
                return;
            }