if u are looking for a simple random string try this php:

echo md5(time());

or md5() a random number your choice.

md5() genetates a one way non-reversable hash. which could be kept in a db.

here is an example of the md5 hash of my library card number:
11d560821fb027c227d837df53a5a73a

md5()  is often used to store passwords and make them non-viewable.

if you are just looking for a unique number an auto-increment coloumn in
mysql or what ever should do it.


--
JJ Harrison
[EMAIL PROTECTED]
www.tececo.com

"Rainydays Sunshine" <[EMAIL PROTECTED]> wrote in message
[EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> Any ideas how to generate a unique serial number that you can check that
> it's valid..
>
> Thanks...
>
>



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