/** * @param SiteConfig $config * @param SiteTree $owner * @param string $metadata * * @return void * */ public function updateMetadata(SiteConfig $config, SiteTree $owner, &$metadata) { // Facebook App ID if ($config->FacebookAppID) { $metadata .= $owner->MarkupComment('Facebook Insights'); $metadata .= $owner->MarkupFacebook('fb:app_id', $config->FacebookAppID, false); // Admins (if App ID) foreach ($config->FacebookAdmins() as $admin) { if ($admin->FacebookProfileID) { $metadata .= $owner->MarkupFacebook('fb:admins', $admin->FacebookProfileID, false); } } } }