function serialnumber()
{
$s = strtoupper(md5(uniqid(rand(),true)));
$serialnr =
'SER-' .
substr($s,0,8) . '-' .
substr($s,8,4) . '-' .
substr($s,12,4). '-' .
substr($s,16,4). '-' .
substr($s,20);
return $serialnr;
}
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