$filesize = filesize('mp_files/'.$ranhaenge['realname']);
if ($filesize > 999) {
$filesize = bcdiv($filesize, '1024', 0).' KBytes';
if ($filesize > 999) {
$filesize = bcdiv($filesize, '1024', 1).' MBytes';
if ($filesize > 999) {
$filesize = bcdiv($filesize, '1024'...