How can PHP be utilized to prevent multiple votes from the same user in a rating system?

To prevent multiple votes from the same user in a rating system, you can use sessions to track whether a user has already voted. When a user submits a vote, you can check if their user ID or IP address is already stored in a session variable. If it is, you can prevent the user from voting again. 

session_start();

if(isset($_SESSION['voted'])) {
    echo "You have already voted";
} else {
    // Process the vote
    $_SESSION['voted'] = true;
    echo "Thank you for your vote!";
}

Keywords

PHP prevent multiple votes rating system user

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