Zend\Diactoros\ServerRequest::getAttribute PHP Method

    public function getAttribute($attribute, $default = null)
    {
        if (!array_key_exists($attribute, $this->attributes)) {
            return $default;
        }
        return $this->attributes[$attribute];
    }

 /**
  * Create instance
  *
  * @return Engine
  */
 public function create(Request $request)
 {
     $engine = new Engine($this->options['view_path'], null);
     // Add folder shortcut (assets::file.js)
     $engine->addFolder('assets', $this->options['assets_path']);
     $engine->addFolder('view', $this->options['view_path']);
     $session = $request->getAttribute(SessionMiddleware::ATTRIBUTE);
     $baseUrl = $request->getAttribute('base_url');
     // Register Asset extension
     $cacheOptions = array('cachepath' => $this->options['cache_path'], 'cachekey' => $session->get('user.locale'), 'baseurl' => $baseUrl, 'minify' => $this->options['minify']);
     $engine->loadExtension(new \Odan\Plates\Extension\AssetCache($cacheOptions));
     return $engine;
 }