Define expiration for each key

Hello
I need define expiration for each key
Example for title => 3000
for id => 20000

I need this feature for define expiration for token that i make it when user login to site

Also can i define statistic session id for each session? (i change session id only)
I need session id keep until i dont change it no changing with codeigniter
Thanks

Why not just store a cookie on the users system for the expiration value, encrypted of course.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

Why not just store a cookie on the users system for the expiration value, encrypted of course.

Oh yes you right
OK
Now how do i define statistic session id for always?

And important point is that
I need save token in session and if save it in cookie so hacker can access to it easy
So i have to save to session

You need to keep in mind about Session Fixation...

So I would leave the CI Sessions alone.

If you always need a session id I would create my own class for it and use the database to store the
my session id and to store the expiration time. Then also use a cookie to keep track of it all.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

You need to keep in mind about Session Fixation...

So I would leave the CI Sessions alone.

If you always need a session id I would create my own class for it and use the database to store the
my session id and to store the expiration time. Then also use a cookie to keep track of it all.

Thank you for your good solution