php - Separate session for each directory in htdocs folder in apache -

i have hosted more 1 projects on same server i.e; each project have created separate directory in htdocs folder. problem same session shared between of projects. there way can separate session each project directory?

i using default php session interface

note: projects shares common variable names stored in session, isloggedin. if user logged in 1 of projects can access other projects without login (big issue).

one way stop use diiferent variable names each project. not interfear ex: isloggedin_project1, isloggedin_project2 etc. *

but @ point cannot change source code projects, lot of effort. kindly suggest way through apache server create/use different session each project directory

use session_name function differentiate between pages/sites.