Cookie session

This class stores session variables in a persistent cookie, so when the user returns to the site after the session has expired, the session variables may be reloaded from the cookie, as if the continues the navigating in the site using the same session.

For instance, if you use a session to store information about the data that a user entered on your site, for example items in a shopping cart, it may be important to not loose this data. So the shopping cart information is stored also in a cookie. If there is a problem on the site or on the client 's browser, when user returns, he may resume shopping where he left.