[PHP] Voting Polls and preventing multiple votes

[Dan Rossi]

Hi there I am mocking up a quick voting poll system, however I would 
like to put hooks in place to prevent users posting more than once, 
voting bots etc. Is there a way to prevent them, obviously sessions, 
cookies, host ips cant be used as they can be removed, and especially 
with host ips , ppl are usually behind a proxy ip that doesnt 
forwarding the referring ip. Let me know if anyone has cooked up 
something like this thanks. I have the voting mechanism and result 
displaying fine, just the special checks to prevent the form being 
displayed.

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