GrumPHP\Parser\Php\Configurator\TraverserConfigurator::registerVisitorId PHP Method

    public function registerVisitorId($alias, $visitorId)
    {
        if (array_key_exists($alias, $this->registeredVisitorIds)) {
            $registeredId = $this->registeredVisitorIds[$alias];
            throw new RuntimeException(sprintf('The visitor alias %s is already registered to visitor with id %s.', $alias, $registeredId));
        }
        $this->registeredVisitorIds[$alias] = (string) $visitorId;
    }