How can cookies be used to track user voting in a PHP survey?

Cookies can be used to track user voting in a PHP survey by setting a cookie when a user submits their vote. This cookie can store the user's vote and prevent them from voting again. When a user accesses the survey page, the PHP code can check for the presence of this cookie and display a message indicating that the user has already voted. 

// Check if the user has already voted
if(isset($_COOKIE['voted'])){
    echo "You have already voted in this survey.";
} else {
    // Process the user's vote
    $vote = $_POST['vote'];
    
    // Save the user's vote in a cookie
    setcookie('voted', $vote, time() + (86400 * 30), "/"); // Cookie expires in 30 days
    
    // Display a thank you message
    echo "Thank you for voting!";
}

Keywords

cookies user voting PHP tracking survey

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