PHP session lost after redirect
php, redirect, session, session-cookies, shared-hosting
Solution
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)
Problem
How do I resolve the problem of losing a session after a redirect in PHP? Recently, I encountered a very common problem of losing session after redirect. And after searching through this website I can still find no solution (although this came the closest).