block ratimg for second time

hii guys,
I have done a rating site . where in the guest is also allowed to rate .

I wanted to know which is the best way so that the same guest user he does not rate it second time .
If i block using the Ip address,problem is that they might be using proxy .
how do i do a time block say agin after some time only he rates again.

or is there any better solution for this !

re: block ratimg for second time

what about a cookie?

re: block ratimg for second time

can u brief about this technique plz!! how to do it!

re: block ratimg for second time

cookies
cookies @ php.net
cookies @ w3schools.com

re: block ratimg for second time

what if the user has blocked the cookies. can we do this using sessions??

re: block ratimg for second time

of course you can use sessions. (though they also use cookies)

re: block ratimg for second time

i mean to say when the mysql add function is executed a session variable is set and after some time say 2 minutes destroy/unset the session variable !so that the user can rate after 2 minutes . is this a gud idea?

re: block ratimg for second time

doesn’t sound bad…
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re: block ratimg for second time

i did the way i talked about with u !! but when the browser gets closed once and again opened the rating gets opened up ..how to prevent this ..

re: block ratimg for second time

I don’t know, how you set the session cookie…

re: block ratimg for second time

i was just setting few variable as session variables and checking for these values when the page loads !!!

re: block ratimg for second time

is irrelevant if your session cookie is destroyed when the browser is closed.

re: block ratimg for second time

okie ! i am not much experienced with sessions and cookies!
can u plz tell me how to do it !!i have told u ma logic !!!

re: block ratimg for second time

looks like you have to modify the session.cookie_lifetime variable. see Session Runtime Configuration