How to manange two different codeigniter session value in localhost?

Hello

Here issue If we Install Two codeigniter in localhost then some time session value config with another codeigniter .

for example

I Have to develope two different different site in login query i am create user_login session for two website same. one site login  it's effect to another site

if one of site logout then second website automatically logout.

for this issue we have to manage config file.

all website set in config file this

$config['sess_cookie_name'] = 'you own name for the session';