Q:

php sessions appear in other directories

I have some folders in my server where i have several scripts which use sessions for several actions. 
For example my admin panel on folder1 has a session called adm_sess which tells me if i am logged in or not. 
Then when i go to folder2 which has nothing to do with the previous script, and i do
print_r($_SESSION);

i see that session(adm_sess) and that causes my server sessions to interact with other sessions created in other folders and change them dynamically. 
Why does that happens and how can i make the sessions on each folder be active only within that directory? 

A:

use session_name();
before 
session_start(); 

call 
session_name("first");
session_start(); 

and for second
session_name("second");
session_start(); 

