PHP session lost after redirect

Question 1

First, carry out these usual checks:

Make sure session_start(); is called before any sessions are being called. So a safe bet would be to put it at the beginning of your page, immediately after the opening <?php declaration before anything else. Also ensure there are no whitespaces/tabs before the opening <?php declaration.
After the header redirect, end the current script using exit(); (Others have also suggested session_write_close(); and session_regenerate_id(true), you can try those as well, but I'd use exit();)
Make sure cookies are enabled in the browser you are using to test it on.
Ensure register_globals is off, you can check this on the php.ini file and also using phpinfo(). Refer to this as to how to turn it off.
Make sure you didn't delete or empty the session
Make sure the key in your $_SESSION superglobal array is not overwritten anywhere
Make sure you redirect to the same domain. So redirecting from a www.yourdomain.com to yourdomain.com doesn't carry the session forward.
Make sure your file extension is .php (it happens!)

Now, these are the most common mistakes, but if they didn't do the trick, the problem is most likely to do with your hosting company. If everything works on localhost but not on your remote/testing server, then this is most likely the culprit. So check the knowledge base of your hosting provider (also try their forums etc). For companies like FatCow and iPage, they require you to specify session_save_path. So like this:

session_save_path('"your home directory path"/cgi-bin/tmp');
session_start();

(replace "your home directory path" with your actual home directory path. This is usually within your control panel (or equivalent), but you can also create a test.php file on your root directory and type:

<?php echo $_SERVER['SCRIPT_FILENAME']; ?>

The bit before 'test.php' is your home directory path. And of course, make sure that the folder actually exists within your root directory. (Some programs do not upload empty folders when synchronizing)

Question 2

you should use "exit" after header-call

header('Location: http://www.example.com/?blabla=blubb');
exit;

Question 3

I tried all possible solutions, but none worked for me! Of course, I am using a shared hosting service.

In the end, I got around the problem by using 'relative url' inside the redirecting header !

header("location: http://example.com/index.php")

nullified the session cookies

header("location: index.php")

worked like a charm !

Question 4

I had the same problem. I worked on it for several hours and it drove me crazy.

In my case the problem was a 404 called due to a missing favicon.ico in Chrome and Firefox only. The other navigators worked fine.

Question 5

I was having the same problem. All of a sudden SOME of my session variables would not persist to the next page. Problem turned out to be ( in php7.1) you header location must not have WWW in it, ex https://mysite. is ok, https://www.mysite. will lose that pages session variables. Not all, just that page.

Question 6

When i use relative path "dir/file.php" with in the header() function in works for me. I think that the session is not saved for some reason when you redirect using the full url...

//Does retain the session info for some reason
header("Location: dir");

//Does not retain the session for some reason
header("Location: https://mywebz.com/dir")

Question 7

I had a similar problem, although my context was slightly different. I had a local development setup on a machine whose hostname was windows and IP address was 192.168.56.2.

I could access the system using either of:

After logging in, my PHP code would redirect using:

header('http://windows/');

If the previous domain name used to access the system was not windows, the session data would be lost. I solved this by changing the code to:

header('http://'.$_SERVER['HTTP_HOST'].'/');

It now works regardless of what local domain name or IP address the user puts in.

I hope this may be useful to someone.

Question 8

I ran into this issue on one particular page. I was setting $_SESSION values in other pages right before redirecting and everything was working fine. But this particular page was not working.

Finally I realized that in this particular page, I was destroying the session at the beginning of the page but never starting it again. So my destroy function changed from:

function sessionKill(){

    session_destroy();

}

to:

function sessionKill(){

    session_destroy();
    session_start();

}

And everything worked!

Question 9

This stumped me for a long time (and this post was great to find!) but for anyone else who still can't get sessions between page redirects to work...I had to go into the php.ini file and turn cookies on:

session.use_cookies = 1

I thought sessions worked without cookies...in fact I know they SHOULD...but this fixed my problem at least until I can understand what may be going on in the bigger picture.

Question 10

I had the same problem and found the easiest way. I simply redirected to a redirect .html with 1 line of JS

<!DOCTYPE html>
<html>
<script type="text/javascript">
<!--
window.location = "admin_index.php";
//–>
</script>
</html>

instead of PHP

header_remove();
header('Location: admin_login.php');
die;

I hope this helps.

Love Gram

Question 11

I've been struggling with this for days, checking/trying all the solutions, but my problem was I didn't call session_start(); again after the redirect. I just assumed the session was 'still alive'.

So don't forget that!

Question 12

If you are using session_set_cookie_params() you might want to check if you are passing the fourth param $secure as true. If you are, then you need to access the url using https.

The $secure param being true means the Session is only available within a secure request. This might affect you locally more than in stage or production environments.

Mentioning it because I just spent most of today trying to find this issue, and this is what solved it for me. I was just added to this project and no one mentioned that it required https.

So you can either use https locally, or you can set the $secure param to FALSE and then use http locally. Just be sure to set it back to true when you push your changes up.

Depending on your local server, you might have to edit DocumentRoot in the httpd-ssl.conf of the server so that your local url is served https.

Question 13

Another possible reason:

That is my server storage space. My server disk space become full. So, I have removed few files and folders in my server and tried.

It was worked!!!

I am saving my session in AWS Dynamo DB, but it still expects some space in my server to process the session. Not sure why!!!

Question 14

Nothing worked for me but I found what caused the problem (and solved it):

Check your browser cookies and make sure that there are no php session cookies on different subdomains (like one for "www.website.com" and one for "website.com").

This was caused by a javascript that incorrectly used the subdomain to set cookies and to open pages in iframes.

Question 15

ini_set('session.save_path',realpath(dirname($_SERVER['DOCUMENT_ROOT']) . '/../session'));
session_start();

Too late to reply but this worked for me

Question 16

To me this was permission error and this resolved it:

chown -R nginx:nginx /var/opt/remi/php73/lib/php/session

I have tested a few hours on PHP and the last test I did was that I created two files session1.php and session2.php.

session1.php:

session_start();

$_SESSION["user"] = 123;

header("Location: session2.php");

session2.php:

session_start();

print_r($_SESSION);

and it was printing an empty array.

At this point, I thought it could be a server issue and in fact, it was.

Hope this helps someone.

Question 17

KEY POINT'S

Do not start a session on the return page.
Don't use session variable and not include header.php which user session variable
Just make a link go to home page or profile page after insert payment info and status

Question 18

Verify that your session is not Strict. If it is, when you come back, like coming back from Stripe, it regenerate the session.

Use This:

ini_set('session.cookie_samesite', 'Lax');

Question 19

I also had the same issue with the redirect not working and tried all the solutions I could find, my header redirect was being used in a form.

I solved it by putting the header redirect in a different php page 'signin_action.php' and passing the variables parameters through I wanted in url parameters and then reassigning them in the 'signin_action.php' form.

signin.php

if($stmt->num_rows>0) {
$_SESSION['username'] = $_POST['username'];
echo '<script>window.location.href = "http://'.$root.'/includes/functions/signin_action.php?username='.$_SESSION['username'].'";</script>';
error_reporting(E_ALL);

signin_action.php

<?php
require('../../config/init.php');
$_SESSION['username'] = $_GET['username'];
if ($_SESSION['username']) {

echo '<script>window.location.href = "http://'.$root.'/user/index.php";</script>';
exit();
} else {
echo 'Session not set';
}

?>

It is not a beautiful work-around but it worked.

Question 20

For me the error was that I tried to save an unserialisable object in the session so that an exception was thrown while trying to write the session. But since all my error handling code had already ceased any operation I never saw the error.

I could find it in the Apache error logs, though.

Question 21

Just for the record... I had this problem and after a few hours of trying everything the problem was that the disk was full, and php sessions could not be written into the tmp directory... so if you have this problem check that too...

Question 22

For me, Firefox has stored session id (PHPSESSID) in a cookie, but Google Chrome has used GET or POST parameter. So you only have to ensure that the returning script (for me: paypal checkout) commit PHPSESSID in url or POST parameter.

Question 23

After trying many solutions here on SO and other blogs... what worked for me was adding .htaccess to my website root.

RewriteEngine on
RewriteCond %{HTTP_HOST} ^yoursitename.com$
RewriteRule ^.*$ "http\:\/\/www\.yoursitename\.com" [R=301,L]

Question 24

If you're using Wordpress, I had to add this hook and start the session on init:

function register_my_session() {
    if (!session_id()) {
        session_start();
    }
}
add_action('init', 'register_my_session');

Question 25

First of all, make sure you are calling session_start() before using $_SESSION variable.

If you have disabled error reporting, try to turn in on and see the result.

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

The most common reasons that aren't mentioned in @dayuloli's answer:

Disk space problem. Make sure your disk space is not full, you need some space to store session files.
Session directory may not be writable. You can check it with is_writable(session_save_path())

Question 26

I was having the same problem and I went nuts searching in my code for the answer. Finally I found my hosting recently updated the PHP version on my server and didn't correctly set up the session_save_path parameter on the php.ini file.

So, if someone reads this, please check php.ini config before anything else.

Question 27

Make sure session_write_close is not called between session_start() and when you set your session.

session_start();

[...]

session_write_close();

[...]

$_SESSION['name']='Bob'; //<-- won't save

Question 28

If you are using Laravel and you experience this issue, what you need is to save your session data before redirecting.

session()->save();
// Redirect the user to the authorization URL.
header('Location: ' . $authorizationUrl);
exit;

Question 29

Now that GDPR is a thing, people visiting this question probably use a cookie script. Well, that script caused the problem for me. Apparently, PHP uses a cookie called PHPSESSID to track the session. If that script deletes it, you lose your data.

I used this cookie script. It has an option to enable "essential" cookies. I added PHPSESSID to the list, the script stopped deleting the cookie, and everything started to work again.

You could probably enable some PHP setting to avoid using PHPSESSID, but if your cookie script is the cause of the problem, why not fix that.

Question 30

I fixed this problem after many days of debugging and it was all because my return URL coming from PayPal Express Checkout didn't have a 'www'. Chrome recognized that the domains should be treated the same but other browsers sometimes didn't. When using sessions/cookies and absolute paths, don't forget the 'www'!