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:

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

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

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