Library to aid with creating sites that users register for
<p>I am trying to create a website that users have to register for, and this gives them access to all the site features. Potentially, maybe i want users to pay a yearly subscription fee.</p>

<p>Is there a library to handle this for me? This should include, keeping track of user cookie and logged in status, keeping track of expiry date, verifying email addresses, banned users... etc.
I mainly use PHP and MySQL but am open to using something else if there is this really good library out there.</p>

<p>Thanks.</p>
