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Automatically re-direct a user when session Times out or goes idle

I want to have a timer going to run every 3 minutes on the page (javascript), to detect if a php session ($_SESSION) has timed out… and if so, redirect them automatically.

A good example would be, a user logs in and runs up stairs, and never comes back down… I want the javascript to log them out with a simple redirect…

Is this possible? and how would I do such a thing? I am using PHP and JavaScript.

What Rob Kennedy said below is exactly what I am looking for:

…when the session times out, the browser should be told to navigate away from the current page. Some banks do this after a period of inactivity, for example.

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Answer

You could use a simple meta refresh:

JavaScript

Or you implement a timeout with PHP:

JavaScript

Then you don’t need to check every 3 minutes if the session is still valid.

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