private function save($key, $data)
    {
        $path = $this->getPath($key);

        if (isset($this->locks[$key])) {
            $fp = $this->locks[$key];
            @ftruncate($fp, 0);
            @fseek($fp, 0);
            $len = @fwrite($fp, $data);
            if (\strlen($data) !== $len) {
                @ftruncate($fp, 0);

                return false;
            }
        } else {
            if (!file_exists(\dirname($path)) && false === @mkdir(\dirname($path), 0777, true) && !is_dir(\dirname($path))) {
                return false;
            }

            $tmpFile = tempnam(\dirname($path), basename($path));
            if (false === $fp = @fopen($tmpFile, 'wb')) {
                @unlink($tmpFile);

                return false;
            }
            @fwrite($fp, $data);
            @fclose($fp);

            if ($data != file_get_contents($tmpFile)) {
                @unlink($tmpFile);

                return false;
            }

            if (false === @rename($tmpFile, $path)) {
                @unlink($tmpFile);

                return false;
            }
        }

        @chmod($path, 0666 & ~umask());
    }