Neos\Flow\Security\Authentication\EntryPoint\WebRedirect::extractRouteValue PHP Метод

    protected function extractRouteValue(array &$routeValues, $key)
    {
        if (!isset($routeValues[$key])) {
            return null;
        }
        $routeValue = $routeValues[$key];
        unset($routeValues[$key]);
        return $routeValue;
    }