What are the recommended methods for handling user sessions and tracking votes in PHP applications to prevent duplicate or unauthorized voting activities?

To prevent duplicate or unauthorized voting activities in PHP applications, it is recommended to use user sessions to track user activity and limit the number of votes a user can submit. Additionally, implementing CSRF tokens can help prevent unauthorized voting by ensuring that the request is coming from a legitimate source. 

// Start a session to track user activity
session_start();

// Check if the user has already voted
if(isset($_SESSION['voted'])){
    echo "You have already voted.";
} else {
    // Process the vote
    // Insert the vote into the database

    // Set a flag in the session to prevent duplicate voting
    $_SESSION['voted'] = true;
    echo "Vote submitted successfully.";
}

Keywords

sessions voting duplicate voting unauthorized voting security

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