On Mon, Mar 9, 2009 at 9:56 PM, chad qian <nynj.t...@hotmail.com> wrote:

>  Hi,
> I need to generate random 8-digit numbers continuously.And no
> duplication among all those numbers.In other word,every single 8-digit
> number must be unique.
>

It is not mathematically feasible to continuously generate unique random
numbers with any upper bound.  They will repeat at some point.  Why don't
you tell us more about the problem you're trying to solve, because there's
probably a much simpler solution.


> How to do php programming?
>

That question requires a much longer answer.
-c
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