Illuminate\Routing\Router::addRoute PHP Method

    protected function addRoute($methods, $uri, $action)
    {
        return $this->routes->add($this->createRoute($methods, $uri, $action));
    }

 /**
  * Add a route to the underlying route collection.
  *
  * @param  array|string          $methods
  * @param  string                $uri
  * @param  \Closure|array|string $action
  *
  * @return \Illuminate\Routing\Route
  */
 protected function addRoute($methods, $uri, $action)
 {
     if (in_array('restful', array_flatten($this->groupStack))) {
         parent::addRoute($methods, $uri . $this->formatSuffix, $action);
     }
     return $this->routes->add($this->createRoute($methods, $uri, $action));
 }