title: Free and secure PHP user management system
body: <p>I'm looking for an secure php usermanagement system. It should be just the logics, so no markup or too much content (like messages etc.). I know I could just build it myself, but I doubt if it will be the most effecient usermanangement system.</p>
  
  <p>The system should be at least</p>
  
  <ul>
  <li>able to verify if the user is human</li>
  <li>very secure (security against hacks, but also protect the users from their stupidity)</li>
  <li>effecient (number of users will start at 1k and from then grow exponentially to around 100k)</li>
  <li>capable of handling roles and capabilities</li>
  </ul>
  
  <p>You guys got any recommandations?</p>