title: Actively maintained PHP libraries for user authentication?
body: <p>I'm aware of the risks of rolling your own user authentication scripts, but I'm also wary of using packages that don't seem to be actively maintained: the <a href="http://pear.php.net/package/LiveUser/download/" rel="noreferrer">current version of PEAR LiveUser</a> is almost a year old.</p>
  
  <p>Please recommend (and argue the case for) an actively-maintained user-authentication library which can be integrated into an existing web project. It should ideally support various roles - anonymous users, registered users and administrators at various levels.    </p>