How can the issue of the disappearing error message in the PHP form be resolved?

Issue: The disappearing error message in the PHP form can be resolved by storing the error message in a session variable and displaying it on the form page if it exists. 

<?php
session_start();

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Validate form input
    if (empty($_POST["name"])) {
        $_SESSION["error"] = "Name is required";
    } else {
        // Process form data
        // Clear error message
        unset($_SESSION["error"]);
    }
}

?>

<!DOCTYPE html>
<html>
<head>
    <title>Form</title>
</head>
<body>
    <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
        <input type="text" name="name">
        <button type="submit">Submit</button>
    </form>

    <?php
    if (isset($_SESSION["error"])) {
        echo $_SESSION["error"];
    }
    ?>
</body>
</html>

Keywords

PHP form error message disappearing resolution troubleshooting

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