Autarky\Errors\ErrorHandlerManager::checkHandler PHP Method

    protected function checkHandler($handler)
    {
        if (!$handler instanceof ErrorHandlerInterface && !is_callable($handler) && !is_string($handler)) {
            $type = is_object($handler) ? get_class($handler) : gettype($handler);
            throw new \InvalidArgumentException("Error handler must be callable, string or instance of Autarky\\Errors\\ErrorHandlerInterface, {$type} given");
        }
    }