public function fetch(RequestInterface $request) { $key = $this->getCacheKey($request); if (!($entries = $this->cache->fetch($key))) { return null; } $match = null; $headers = $this->persistHeaders($request); $entries = unserialize($entries); foreach ($entries as $index => $entry) { if ($this->requestsMatch(isset($entry[1]['vary']) ? $entry[1]['vary'] : '', $headers, $entry[0])) { $match = $entry; break; } } if (!$match) { return null; } // Ensure that the response is not expired $response = null; if ($match[4] < time()) { $response = -1; } else { $response = new Response($match[2], $match[1]); if ($match[3]) { if ($body = $this->cache->fetch($match[3])) { $response->setBody($body); } else { // The response is not valid because the body was somehow deleted $response = -1; } } } if ($response === -1) { // Remove the entry from the metadata and update the cache unset($entries[$index]); if ($entries) { $this->cache->save($key, serialize($entries)); } else { $this->cache->delete($key); } return null; } return $response; }