What potential issue arises when using PHP code to display a message after submitting a form?

The potential issue that arises when using PHP code to display a message after submitting a form is that the message may not persist after the page is refreshed. To solve this issue, you can use session variables to store the message and display it on the page after the form submission. 

<?php
session_start();

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Process form submission
    $_SESSION['message'] = "Form submitted successfully!";
    header("Location: {$_SERVER['PHP_SELF']}");
    exit();
}

?>

<!DOCTYPE html>
<html>
<head>
    <title>Form Submission</title>
</head>
<body>
    <?php
    if (isset($_SESSION['message'])) {
        echo "<p>{$_SESSION['message']}</p>";
        unset($_SESSION['message']);
    }
    ?>

    <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
        <!-- Form fields here -->
        <input type="submit" value="Submit">
    </form>
</body>
</html>

Keywords

PHP form submission message display validation security

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