How can session management and user-specific "votes" be implemented in PHP to restrict form submissions to only once per user?

To restrict form submissions to only once per user, session management can be used to keep track of users who have already submitted their votes. By storing a flag in the session indicating that the user has voted, subsequent form submissions can be checked against this flag to prevent multiple votes. 

<?php
session_start();

// Check if the user has already voted
if(isset($_SESSION['voted'])) {
    echo "You have already voted.";
} else {
    // Process the form submission and save the vote
    // For example, save the vote in a database

    // Set a flag in the session to indicate that the user has voted
    $_SESSION['voted'] = true;

    echo "Thank you for your vote!";
}
?>

Keywords

Session management user-specific votes form submissions PHP restrict.

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