Agora_Driver::formatSize PHP Method

    public function formatSize($filesize)
    {
        $units = array('B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB');
        $pass = 0;
        // set zero, for Bytes
        while ($filesize >= 1024) {
            $filesize /= 1024;
            $pass++;
        }
        return round($filesize, 2) . ' ' . $units[$pass];
    }