What are the potential pitfalls of losing POST variables after clicking the submit button in PHP?

Losing POST variables after clicking the submit button in PHP can lead to data loss and errors in form processing. To prevent this issue, you can use session variables to store the POST data temporarily and retrieve it after the page reloads. 

session_start();

if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $_SESSION['post_data'] = $_POST;
    header("Location: ".$_SERVER['PHP_SELF']);
    exit;
}

if (isset($_SESSION['post_data'])) {
    $_POST = $_SESSION['post_data'];
    unset($_SESSION['post_data']);
}

// Process the form data here

Keywords

POST variables submit button form submission session variables data loss

Related Questions