CODEWITHSUNDEEP
phpsession
Duncan Benoit
Duncan Benoit

Reputation: 3347

"Webpage has expired" $_SESSIONS in PHP

In my web-application I'm using $_SESSIONS but sometimes, when the users hits the backspace key he gets:

Webpage has expired

message.

Why is this happening? What can i do to avoid this?

Upvotes: 3

Views: 3558

Answers (3)

Rytmis
Rytmis

Reputation: 32057

Like Chad said, that's the result of going back to a page that was the result of a POST request. And like the comments said, you can't just replace a POST with a GET, because that's a bad idea for a variety of reasons.

However, you can combine the two: let the request be a POST, but issue a Location header redirect, which the browser will then execute as a GET. To the user this will look like a single operation, but to the browser it will be a POST followed by a GET, which effectively eliminates this issue.

Upvotes: 2

VolkerK
VolkerK

Reputation: 96159

It also has to do with the cache control directives sent to the browser. Take a look at http://de.php.net/manual/en/session.configuration.php#ini.session.cache-limiter and http://shiflett.org/articles/how-to-avoid-page-has-expired-warnings to learn more about the cache settings.

http://shiflett.org/articles/how-to-avoid-page-has-expired-warnings:

Recap

To avoid "Page Has Expired" warnings, set session.cache_limiter to private, and make sure that any form using the POST method submits to an intermediate processing page that redirects the user to a different URL.

Upvotes: 2

Chad Birch
Chad Birch

Reputation: 74588

This doesn't have anything to do with $_SESSION variables, it has to do with you transferring information between pages using POST method. If you want to avoid it you need to use GET method instead of POST.

Upvotes: 6

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