Aerys\StandardResponse::setCookie PHP Method

    public function setCookie(string $name, string $value, array $flags = []) : Response
    {
        if ($this->state & self::STARTED) {
            throw new \LogicException("Cannot set header; output already started");
        }
        // @TODO assert() valid $name / $value / $flags
        $this->cookies[$name] = [$value, $flags];
        return $this;
    }