On Sat, Feb 9, 2013 at 8:00 PM, Jonathan Eagle <jeo...@attglobal.net> wrote:

> I'm having a problem with a very straightforward routine; one that works
> in one PHP installation but not on the other. The only difference that I
> can see between the working version and the non-working version is that
> the one that doesn't work is running on the later version of PHP. The
> following basic log-in routine works fine on my personal development
> server, running PHP 5.3.3, but doesn't work on the production server,
> hosted by 1&1.com that is running PHP 5.4.11.
> <?php
> require_once('../includes/initialize.php');  //<== $session object
>                                                init'd and set to false
> if(!$session->is_logged_in())
> {
>         header("Location: login.php");
>         exit;
> }
> ?>
> login.php is in the same directory as the file that has this code at the
> very top of the file.
> Everything works as expected right up to the 'exit;' line.
>       * $session->is_logged_in() is false
>       * when tested immediately after the 'header("Loc...)' statement,
>            'headers_sent()' reports true.
>       * no error messages result (like: 'header already sent', etc.)
> Instead of the program flow moving to 'login.php', the URL indicates
> that the destination is the original file, except that the file is empty
> - zero bytes.  I've tried accessing the routine via three different
> computers, all running different MS operating systems from XP to Win7
> and they all behave identically.  The behavior is also consistent
> between browsers (i.e., FireFox, Chrome, and Windows Explorer).

It seems like the header is not actually send, maybe because the headers
are already sent.
You can check what your server returned with the Developer tools in Chrome,
or Firebug in Firefox. It should have that header in its return, but I
doubt it's there.

> I also did a $_SERVER variable dump immediately before and after the
> 'header(...' line, expecting to see a difference in at least one of the
> 'REDIRECT_*' elements, but both outputs where identical with the
> exception that the $_SERVER ouput after the header statement was
> executed was missing the following line:

$_SERVER refers to headers that were send from client to server, the
redirect header you set is with the headers sent from server to client.

I would try a file like this first:

header("Location: login.php");

and see if that works. Then you can investigate further.

- Matijn

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