yii\httpclient\Message::addCookies PHP Method

    public function addCookies(array $cookies)
    {
        $cookieCollection = $this->getCookies();
        foreach ($cookies as $cookie) {
            if (!is_object($cookie)) {
                $cookie = new Cookie($cookie);
            }
            $cookieCollection->add($cookie);
        }
        return $this;
    }