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copied!<p>Each time <a href="http://php.net/session_start" rel="noreferrer">session_start</a> is called the session files timestamp (if it exists) gets updated, which is used to calculated if session.gc_maxlifetime has been exceeded.</p> <p>More importantly you can't depend on a session to expire after session.gc_maxlifetime time has been exceeded. </p> <p>PHP runs garbage collection on expired sessions after the current session is loaded and by using <a href="http://php.net/manual/en/session.configuration.php#ini.session.gc-probability" rel="noreferrer">session.gc_probability</a> and <a href="http://php.net/manual/en/session.configuration.php#ini.session.gc-divisor" rel="noreferrer">session.gc_divisor</a> it calculates the probability that garbage collection will run. By default its a 1% probability.</p> <p>If you have a low number of visitors there is a probability that an inactive user could access a session that should have expired and been deleted. If this is important to you will need to store a timestamp in the session and calculate how log a user has been inactive.</p> <p>This example replaces <a href="http://php.net/session_start" rel="noreferrer">session_start</a> and enforces a timeout:</p> <pre><code>function my_session_start($timeout = 1440) { ini_set('session.gc_maxlifetime', $timeout); session_start(); if (isset($_SESSION['timeout_idle']) && $_SESSION['timeout_idle'] < time()) { session_destroy(); session_start(); session_regenerate_id(); $_SESSION = array(); } $_SESSION['timeout_idle'] = time() + $timeout; } </code></pre>

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