troubleshooting Question

Using rand() to generate random 6 digit numbers. Is there a better way...???

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Andrew AngellFlag for United States of America asked on
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I need to generate unique ticket numbers for an online raffle that could have around 100k tickets or so generated.  I've currently got this part setup very simple:

$RandomNumber = rand(100000, 999999);

Which of course is generating a random number between 100,000 and 999,999.  This is simply because my client requested a 6 digit ticket ID for all tickets.  

I'm a little worried about the small possibility of a number getting assigned to 2 separate tickets.  Is there way I can randomly generate all 6 digits rather than randomly grabbing a 6 digit number from this range?  I think that would give me more of a guarantee that I won't ever get the same value twice.  

Am I worrying too much?  Any information would be greatly appreciated.  Thanks!
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