User Authentication - Log in User (PHP)

Question

The Log in User server behavior fails to redirect at the
header functions (LoginFailed or LoginSuccess). PHP 5 server
environment. The attached code works correctly with valid or
invalid username/password inputs, but stalls on my login page (no
redirection per the header functions). I have found suggestions to
add a PHP exit command to the code, but that didn't work either.
Does anyone know what PHP tweaks might get my header functions to
redirect properly? I have not modified the generated DW Log in User
code in any way.
<?php
// *** Validate request to login to this site.
if (!isset($_SESSION)) {
session_start();
$loginFormAction = $_SERVER['PHP_SELF'];
if (isset($_GET['accesscheck'])) {
$_SESSION['PrevUrl'] = $_GET['accesscheck'];
if (isset($_POST['username'])) {
$loginUsername=$_POST['username'];
$password=$_POST['password'];
$MM_fldUserAuthorization = "";
$MM_redirectLoginSuccess = "/private.php";
$MM_redirectLoginFailed = "/register.php";
$MM_redirecttoReferrer = false;
mysql_select_db($database_clarke, $clarke);
$LoginRS__query=sprintf("SELECT userID, username FROM users
WHERE userID=%s AND username=%s",
GetSQLValueString($loginUsername, "int"),
GetSQLValueString($password, "text"));
$LoginRS = mysql_query($LoginRS__query, $clarke) or
die(mysql_error());
$loginFoundUser = mysql_num_rows($LoginRS);
if ($loginFoundUser) {
$loginStrGroup = "";
//declare two session variables and assign them
$_SESSION['MM_Username'] = $loginUsername;
$_SESSION['MM_UserGroup'] = $loginStrGroup;
if (isset($_SESSION['PrevUrl']) && false) {
$MM_redirectLoginSuccess = $_SESSION['PrevUrl'];
header("Location: " . $MM_redirectLoginSuccess );
<<<<< this will not redirect
else {
header("Location: ". $MM_redirectLoginFailed );
<<<<< this will not redirect
?>

Answer 1

I have an extension that would help, the PHP Log in Suite. It
contains 34
server behaviors to work with session variables or cookies,
with all the
code generated dynamically. The system is modular, so the
components can be
put together in different ways to create different types of
log in systems.
For full details have a look at
http://www.phploginsuite.co.uk/
. The manual
is available to download, so you can see exactly what the
suite can do
before purchase. It costs �19.99, which is roughly
$36.
Hope this helps and is of interest to you.
Gareth
http://www.phploginsuite.co.uk/
PHP Login Suite V2 - 34 Server Behaviors to build a complete
Login system.