Aerys\Request::setLocalVar PHP Method

    public function setLocalVar(string $key, $value);

 public function __construct(Request $request)
 {
     $this->request = $request;
     $config = $request->getLocalVar("aerys.session.config");
     assert(\is_array($config), 'No middleware was loaded or Aerys\\Session class instantiated in invalid context');
     $this->driver = $config["driver"];
     $config += static::CONFIG;
     $request->setLocalVar("aerys.session.config", $config);
     $id = $request->getCookie($config["name"]);
     if (\strlen($id) === self::ID_LENGTH && strspn($id, self::ALLOWED_ID_CHARS) === self::ID_LENGTH) {
         $this->setId($id);
     }
     $this->ttl = $config["ttl"];
     $this->maxlife = $config["maxlife"];
 }