code: public function setCookie($name, $value, $host = false, $path = '/', $expiry = false)
      {
          $cookie = new SimpleCookie($name, $value, $path, $expiry);
          if ($host) {
              $cookie->setHost($host);
          }
          $this->cookies[$this->findFirstMatch($cookie)] = $cookie;
      }
docs: Sets an additional cookie. If a cookie has the same name and path it is replaced.
  
  @param string $name   Cookie key.
  @param string $value  Value of cookie.
  @param string $host   Host upon which the cookie is valid.
  @param string $path   Cookie path if not host wide.
  @param string $expiry Expiry date.