code: protected function get($key)
      {
          $cache = apc_fetch($this->getKey());
          if (!is_array($cache)) {
              return false;
          } else {
              if (isset($cache[$key])) {
                  return $cache[$key];
              }
              return false;
          }
      }
docs: Returns a part of cached array
  
  @param string $key cache category (action, namespace...)
  
  @return bool