Nette\Caching\Storages\FileStorage::verify PHP Method

    private function verify($meta)
    {
        do {
            if (!empty($meta[self::META_DELTA])) {
                // meta[file] was added by readMetaAndLock()
                if (filemtime($meta[self::FILE]) + $meta[self::META_DELTA] < time()) {
                    break;
                }
                touch($meta[self::FILE]);
            } elseif (!empty($meta[self::META_EXPIRE]) && $meta[self::META_EXPIRE] < time()) {
                break;
            }
            if (!empty($meta[self::META_CALLBACKS]) && !Cache::checkCallbacks($meta[self::META_CALLBACKS])) {
                break;
            }
            if (!empty($meta[self::META_ITEMS])) {
                foreach ($meta[self::META_ITEMS] as $depFile => $time) {
                    $m = $this->readMetaAndLock($depFile, LOCK_SH);
                    if ($m[self::META_TIME] !== $time || $m && !$this->verify($m)) {
                        break 2;
                    }
                }
            }
            return TRUE;
        } while (FALSE);
        $this->delete($meta[self::FILE], $meta[self::HANDLE]);
        // meta[handle] & meta[file] was added by readMetaAndLock()
        return FALSE;
    }