Doctrine\Common\Cache\FileCache::doGetStats PHP Method

    protected function doGetStats()
    {
        $usage = 0;
        foreach ($this->getIterator() as $name => $file) {
            if (!$file->isDir() && $this->isFilenameEndingWithExtension($name)) {
                $usage += $file->getSize();
            }
        }
        $free = disk_free_space($this->directory);
        return [Cache::STATS_HITS => null, Cache::STATS_MISSES => null, Cache::STATS_UPTIME => null, Cache::STATS_MEMORY_USAGE => $usage, Cache::STATS_MEMORY_AVAILABLE => $free];
    }