title: how to bind a php session to user SSL certificate
body: <p>I read a paper in the php manual about session vulnerability. I learned that I need to bind my session to the user SSL certificate, and verify that on every page. I don't quite know what this means.</p>
  
  <p>My site has SSL on every page, there is never any switch and the user can neve access it without https.</p>
  
  <p>Do I need to take measures, in my code, to protect my sessions?</p>