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POIs setting session.gc_probability and session.gc_divisor equal to 100% a bad idea?
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copied!<p><strong>The scenario:</strong></p> <ul> <li>User logs in</li> <li>Cookie is set to length of session</li> <li>After 1 hour of inactivity I wish to log out the user</li> </ul> <p><strong>How I think I can solve this:</strong></p> <ul> <li>Set the session.gc_maxlifetime to 1 hour (3600)</li> <li>Set the session.gc_probability to 1 </li> <li>Set the session.gc_divisor to 1</li> <li>Therefore having a 100% certainty that garbage collection will occur on any idle session cookies after 1 hour.</li> </ul> <p><strong>My question:</strong></p> <p>All the posts and documentation I've read has never mentioned setting a gc change of 100%, therefore is it bad to do this? Is there a better way? </p> <p>It's a symfony app, and long term I would like to do something like this <a href="http://symfony.com/doc/master/components/http_foundation/session_configuration.html#session-meta-data" rel="nofollow noreferrer">http://symfony.com/doc/master/components/http_foundation/session_configuration.html#session-meta-data</a> but for now I was hoping to just do something simple with session.gc_*</p> <p>One post I read implies that having a 100% garbage collection chance is "cost-intensive" <a href="https://stackoverflow.com/questions/520237/how-do-i-expire-a-php-session-after-30-minutes/1270960#1270960">How do I expire a PHP session after 30 minutes?</a> is this true? If so, <em>how</em> cost intensive? </p> <p>Cheers!</p>

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