Redirect without losing variables? [SOLVED]

[monkey_05_06]

I'm fairly new to PHP (I've worked with it a bit in the past, but nothing really serious) and I've encountered something that's bugging me. It's not much really but I was just wondering if it's possible to redirect to another page without losing my variables. I'm using a bit of JavaScript to get information about the browser's width/height, but to get that into PHP I have to post the data.

That's fine and I've gotten that figured out, the problem comes in if I want to use the included JS page as the action page of the form and redirect to the calling page instead of using the calling page as the action page. The problem with using the calling page as the action is that the POST data is then stuck to that page so if the user tries to refresh they get a message about POST data having been sent.

If possible I'd like to be able to save the posted variables and then redirect back to the original page. If it's not possible I guess my users will just have to click their "go" button instead of refresh.

[TEENFRONT]

Use session vars.

[monkey_05_06]

I've set up my code like this:

[code]    $_SESSION["window_width"] = $_POST["window_width"];
    $_SESSION["window_height"] = $_POST["window_height"];
    header("Location: http://localhost/index2.php");[/code]

But the session variables never seem to be getting set. Am I using this wrong?

[trq]

You need to issue a call to [url=http://php.net/session_start]session_start[/url]() on both this page, and the page you redirect to.

[monkey_05_06]

AWESOME! Thanks to both of you for your help!!!

[TEENFRONT]

<?

Session_start();

    $_SESSION["window_width"] = $_POST["window_width"];
    $_SESSION["window_height"] = $_POST["window_height"];
    header("Location: http://localhost/index2.php");

?>


and as suggested, use  session_start() on index.php right at the top of you php page.

[TEENFRONT]

Id also convert the session vars into an easier to use var like below.  then you can use $wwidth etc, rather than the longer $_SESSION["window_width"]

$wwidth = $_SESSION["window_width"];
$wheight = $_SESSION["window_height"];