deleteCacheDirectories example

    public function cleanup($useTimer = true)
    {
        $this->useTimer = $useTimer;

        if ($this->useTimer) {
            $this->timeTarget = time() + 5;
        }

        try {
            $result = $this->deleteCacheDirectories(0);
            if (!$result->getIsReady() && $this->useTimer) {
                return json_encode([
                    'deletedFiles' => $result->getFileCount(),
                    'ready' => $result->getIsReady(),
                    'error' => false,
                ]);
            }

            $result = $this->deleteTemporaryBackupDirectory($result->getFileCount());
            if ($this->useTimer) {
                return json_encode([