Question

So, I implemented a voting system
http://ad1987.blogspot.com/2009/02/reddit-style-voting-with-php-mysql-and.html

on my website. It works perfectly, except for the fact that each time you vote up or vote down it can add anywhere from 1-5 or so votes. The source code is pretty much the same to that on that website, so if you’d like to see it, please check it out there. For a live example:

http://www.campusbasement.com/cornell/entertainment/articles/927/electro-is-taking-over-the-world

Thanks

votes.php: http://pastie.org/1369778

Answer 1

I had a somewhat similar problem. Chrome for some still unknown reason downloaded each page twice, so the views counter was getting +2 each time.

I suppose you have a user table with user_id, and an article table with article_id.
So you can implement the check connecting this two tables with many-to-many relation. You should create an intermediate table with fields post_id – the post being voted for, user_id and optionally a value field (if the user decides to change his vote).
The first two fields might be a composite primary key.

So when user votes, you search for the row with the same post and user ids. If there are non – you add it.