php mysql vote once sample script

Question

PHP mysql vote once script? How it works? user can vote once.... what to use cookie, session?

Answer 1

If you have registered users, just use one column for userID and one column for voteID. create a key on those 2 columns and it's not possible for a user to vote more than 1 time to the same thing.

if you don't have registered users, there is no way, because there is no possibility for an reliable identification.