Destroy or unset session when user close the browser without clicking on logout [duplicate]

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You can set an expiration time for the session data, test it with each session_start call and destroy the session if it’s expired:

session_start();
if (!isset($_SESSION['EXPIRES']) || $_SESSION['EXPIRES'] < time()+3600) {
    session_destroy();
    $_SESSION = array();
}
$_SESSION['EXPIRES'] = time() + 3600;

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