Question

Which function effectively deletes all sessions that have expired?

(a) session_delete()

(b) session_destroy()

(c) session_garbage_collect()

(d) SessionHandler::gc

The question was posed to me in an international level competition.

Asked question is from Session Handling-2 topic in section File and Session Handling in PHP of PHP

Answer 1

Correct option is (d) SessionHandler::gc

For explanation: SessionHandler::gc is used to clean up expired sessions. It is called randomly by PHP internally when a session_start() is invoked.