Language::set PHP Method

    public function set($key, $value)
    {
        $this->data[$key] = $value;
    }

 /**
  * @param $request
  * @param Closure $next
  * @return mixed
  */
 public function handle($request, Closure $next)
 {
     if ($request->get('lang')) {
         \Language::set($request->get('lang'));
     }
     app()->setLocale(\Language::current());
     return $next($request);
 }