code: public function read(string $id)
      {
          if (!($content = $this->client->get($this->getKey($id)))) {
              return false;
          }
  
          $length = strlen($content);
          $saveData = self::unserialize($content);
  
          return [$saveData['data'], $saveData['startTime'], $saveData['accessTime'], $length];
      }
docs: {@inheritdoc}