Can a session variable be accessed on a background php page the user does not see?

if (isset($_SESSION['user']) && $_SESSION['user'] != '') {
  $username = $_SESSION['user'];
}

Open in new window


I have a file upload form. I get a file id number from the url, and use AJAX to send it to a background php page to upload a file. I want that background php page that the user never sees to get the username from a session variable and use that name to cross check the file id from that url by checking the database to verify the file id matches with the username in the same table row.

When I try this, the session variable appears to be empty or it cannot be accessed by a background php page.

My second option would be to send in the url a user id in addition to a file id. Then access the database to be sure the two id's go together. But I think this would be less secure.

1. My question is; Is it true session variables cannot be accessed by background php pages?
2. If yes, then how might I perform a cross check without the session variable? Thanks.
kadinAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Dave BaldwinFixer of ProblemsCommented:
No, 'background' has nothing to do with it.  I use sessions on 'invisible' pages all the time.  But the page Must Always have session_start() at the top of it.  That's how PHP picks up the current session.  On several pages, I even start the session with an AJAX call.  session_start() is the key.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
kadinAuthor Commented:
Thanks. That didn't even occur to me.
0
Dave BaldwinFixer of ProblemsCommented:
You're welcome, glad to help.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
PHP

From novice to tech pro — start learning today.

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.