Every programmer working with PHP session cookies has gotten “Page has expired” warnings from time to time. The most common cause is simple: a user, when a session cookie is set, clicks on the Back button. Because the pages are not being cached, the page has, in essence, expired.
As Chris Shiflett points out in his blog post (which you should read after this), the fix is simple. PHP, by default, sends a Cache-Control: nocache header. To override it, set this header in your php.ini file or with a call to ini_set():
1 | session.cache_limiter = private |
This will cause the server to send a Cache-Control: private header instead. Restart your Web server, and pages will be cached for three hours by default. As always, test that out and see if it causes problems.
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