destroy_login_after_time php

public function destroy_login_after_time(){
			if (isset($_SESSION["LAST_ACTIVITY"]) && (time() - $_SESSION["LAST_ACTIVITY"] > $this->destroy_login_after_time)) {
                session_destroy();
                session_unset();
            }

            $_SESSION['LAST_ACTIVITY'] = time(); // update last activity time stamp
		}