Newscoop\Services\AttachmentService::getLevel2DirectoryName PHP Method

    private function getLevel2DirectoryName(Attachment $attachment)
    {
        if ($attachment->getId()) {
            $level2Dir = $attachment->getId() / $this->config['file_num_dirs_level_2'] % $this->config['file_num_dirs_level_1'];
        } else {
            $level2Dir = 0;
        }
        $level2ZeroPad = strlen($this->config['file_num_dirs_level_2']);
        return sprintf('%0' . $level2ZeroPad . 'd', $level2Dir);
    }