Contao\System::getReferer PHP Méthode

    public static function getReferer($blnEncodeAmpersands = false, $strTable = null)
    {
        /** @var SessionInterface $objSession */
        $objSession = static::getContainer()->get('session');
        $ref = \Input::get('ref');
        $key = \Input::get('popup') ? 'popupReferer' : 'referer';
        $session = $objSession->get($key);
        // Unique referer ID
        if ($ref && isset($session[$ref])) {
            $session = $session[$ref];
        } elseif (TL_MODE == 'BE' && is_array($session)) {
            $session = end($session);
        }
        // Use a specific referer
        if ($strTable != '' && isset($session[$strTable]) && \Input::get('act') != 'select') {
            $session['current'] = $session[$strTable];
        }
        // Remove parameters helper
        $cleanUrl = function ($url, $params = array('rt', 'ref')) {
            if ($url == '' || strpos($url, '?') === false) {
                return $url;
            }
            list($path, $query) = explode('?', $url, 2);
            /** @var Query $queryObj */
            $queryObj = new Query($query);
            $queryObj = $queryObj->without($params);
            return $path . $queryObj->getUriComponent();
        };
        // Determine current or last
        $strUrl = $cleanUrl($session['current']) != $cleanUrl(\Environment::get('request')) ? $session['current'] : $session['last'];
        // Remove the "toggle" and "toggle all" parameters
        $return = $cleanUrl($strUrl, array('tg', 'ptg'));
        // Fallback to the generic referer in the front end
        if ($return == '' && TL_MODE == 'FE') {
            $return = \Environment::get('httpReferer');
        }
        // Fallback to the current URL if there is no referer
        if ($return == '') {
            $return = TL_MODE == 'BE' ? 'contao/main.php' : \Environment::get('url');
        }
        // Do not urldecode here!
        return ampersand($return, $blnEncodeAmpersands);
    }

 /**
  * Toggles the TL_VIEW cookie and redirects back to the referring page.
  *
  * @param GetResponseEvent $event The event object
  */
 public function onKernelRequest(GetResponseEvent $event)
 {
     $request = $event->getRequest();
     if (!$this->isFrontendMasterRequest($event) || !$request->query->has('toggle_view')) {
         return;
     }
     $this->framework->initialize();
     $response = new RedirectResponse(System::getReferer(), 303);
     $response->headers->setCookie($this->getCookie($request->query->get('toggle_view'), $request->getBasePath()));
     $event->setResponse($response);
 }