if ($stmt = $dbconn->prepare('INSERT INTO `astm_clients_tbl` (`u_name`, `u_email`, `u_password`, `u_plain_password`, `u_phone`, `u_referral_id`, `u_referrer`, `u_join_date`) VALUES (?, ?, ?, ?, ?, ?, ?, ?)')) {
$stmt->bind_param('ssssssss', $auth_name, $to, $password, $plainPass, $tel, $ref_id, $ref, $join_date);
$stmt->execute();
header('Location: register.php?msg=success');
exit();
$stmt->close();
} else {
header('Location: register.php?msg=error');
exit();
}