php - Is it possible to clear a different session's variable? -

i have information stored on $_session, session stored on database through custom session handler.

is there standard way either 'impersonate' session having session id or clear specific variables session.

i asking because have web application, session variables on own working, actual shopping cart order information using paypal. paypal returns response of payment through ipn (notifications), request made server site. requests, of course, initiate own sessions.

what want find way clear original session variable paypal notification request sees different session. there way that?

one idea might manually edit database in session data stored, want standard, regardless of session handlers.

i asking because have web application, session variables on own working, actual shopping cart order information using paypal. paypal returns response of payment through ipn (notifications), request made server site. requests, of course, initiate own sessions.

what want find way clear original session variable paypal notification request sees different session. there way that?

if you've found needing edit data in else's session, shouldn't storing data in session begin with.

if need read or otherwise work ipns, perhaps should store them in database in actual table. can associate row user's session id, or preferably login or email address.