What are some common methods for preventing multiple clicks on a vote button in PHP?

One common method for preventing multiple clicks on a vote button in PHP is to disable the button after it has been clicked once. This can be achieved by using JavaScript to disable the button on click and prevent subsequent clicks. Another approach is to use session variables to track whether a user has already voted, and then conditionally disable the button based on this information. 

<?php
session_start();

if(isset($_POST['vote_button'])) {
    if(!isset($_SESSION['has_voted'])) {
        // Process the vote
        $_SESSION['has_voted'] = true;
    }
}
?>

<form method="post">
    <button type="submit" name="vote_button" <?php if(isset($_SESSION['has_voted'])) { echo 'disabled'; } ?>>
        Vote
    </button>
</form>

Keywords

PHP prevent multiple clicks vote button button disable

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