title: How to keep session unchanged in codeigniter?
body: <p>I'm trying to create a shopping cart by storing the cart in a table in a database, instead of using the built-in CI cart class. I use sessionID to identify one visitor from another. But I found that the sessionID is changing for a period of time, even the visitor doesn't close the browser. </p>
  
  <p>Is this a normal behavior of CI to renew the sessionID for a short period of time? Is there a way to make it unchanged until the visitor close the browser?</p>
  
  <p>Thank you at advance.</p>