hasInvalidationState example

/** @var bool|array{maxAge?: int, states?: list<string>}|null $cache */
        $cache = $request->attributes->get(PlatformRequest::ATTRIBUTE_HTTP_CACHE);
        if (!$cache) {
            return;
        }

        if ($cache === true) {
            $cache = [];
        }

        if ($this->hasInvalidationState($cache['states'] ?? [], $states)) {
            return;
        }

        $maxAge = $cache['maxAge'] ?? $this->defaultTtl;

        $response->setSharedMaxAge($maxAge);
        $response->headers->addCacheControlDirective('must-revalidate');
        $response->headers->set(
            self::INVALIDATION_STATES_HEADER,
            implode(',', $cache['states'] ?? [])
        );