Piwik\View::setXFrameOptions PHP Method

    public function setXFrameOptions($option = 'deny')
    {
        if ($option === 'deny' || $option === 'sameorigin') {
            $this->xFrameOptions = $option;
        }
        if ($option == 'allow') {
            $this->xFrameOptions = null;
        }
    }

 /**
  * @return View
  * @throws \Exception
  */
 public function getOptOutView()
 {
     if ($this->view) {
         return $this->view;
     }
     $trackVisits = !IgnoreCookie::isIgnoreCookieFound();
     $dntFound = $this->getDoNotTrackHeaderChecker()->isDoNotTrackFound();
     $setCookieInNewWindow = Common::getRequestVar('setCookieInNewWindow', false, 'int');
     if ($setCookieInNewWindow) {
         $reloadUrl = Url::getCurrentQueryStringWithParametersModified(array('showConfirmOnly' => 1, 'setCookieInNewWindow' => 0));
     } else {
         $reloadUrl = false;
         $nonce = Common::getRequestVar('nonce', false);
         if ($nonce !== false && Nonce::verifyNonce('Piwik_OptOut', $nonce)) {
             Nonce::discardNonce('Piwik_OptOut');
             IgnoreCookie::setIgnoreCookie();
             $trackVisits = !$trackVisits;
         }
     }
     $language = Common::getRequestVar('language', '');
     $lang = APILanguagesManager::getInstance()->isLanguageAvailable($language) ? $language : LanguagesManager::getLanguageCodeForCurrentUser();
     $this->view = new View("@CoreAdminHome/optOut");
     $this->view->setXFrameOptions('allow');
     $this->view->dntFound = $dntFound;
     $this->view->trackVisits = $trackVisits;
     $this->view->nonce = Nonce::getNonce('Piwik_OptOut', 3600);
     $this->view->language = $lang;
     $this->view->showConfirmOnly = Common::getRequestVar('showConfirmOnly', false, 'int');
     $this->view->reloadUrl = $reloadUrl;
     $this->view->javascripts = $this->getJavascripts();
     $this->view->stylesheets = $this->getStylesheets();
     $this->view->title = $this->getTitle();
     return $this->view;
 }