php - how to restrict registered user from trying to vote again -


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i'm new php coding , website designing.

i'm trying develop online voting system, registered users only, allowed vote. have done , it's working fine, need after user have logged out, how can make user not able login again , vote twice? or how can redirect user second time?

you can manage user taking field in database table. applying condition on field @ time of login able restrict user had given vote.


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