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There is a session cookie with expiration time which says 'At end of session'. When exactly does it expire or will it be alive forever?
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To set a cookie so it expires at the end of the browsing session, simply OMIT the expiration parameter altogether. Show activity on this post. End of the user session means when the browser is shut down. Not anymore.
You can extend the life of a cookie beyond the current browser session by setting an expiration date and saving the expiry date within the cookie. This can be done by setting the 'expires' attribute to a date and time.
If a cookie has expired, the browser does not send that particular cookie to the server with the page request; instead, the expired cookie is deleted.
Cookies that 'expire at end of the session' expire unpredictably from the user's perspective!
On iOS with Safari they expire whenever you switch apps!
On Android with Chrome they don't expire when you close the browser.
On Windows desktop running Chrome they expire when you close the browser. That's not when you close your website's tab; its when you close all tabs. Nor do they expire if there are any other browser windows open. If users run web apps as windows they might not even know they are browser windows. So your cookie's life depends on what the user is doing with some apparently unrelated app.
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When you use setcookie, you can either set the expiration time to 0 or simply omit the parameter - the cookie will then expire at the end of session (ie, when you close the browser).
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