public static function confirmation() { if (empty($_SESSION['data'])) { header('Location: index.php'); } if (isset($_POST['submit'])) { $ref = $_POST; $old = $_SESSION['data']; if ($ref['invoiceID'] === $old['invoiceID']) { Form::sendMail($old); Form::checkIn($old); } else { echo 'Invoice Didnt Matched!'; } session_destroy(); } }