chamilo / chamilo-lms

            }

            // Delete existing users

            if ($empty_users) {

                foreach ($existingUsers as $existing_user) {

                    if (!in_array($existing_user, $user_list)) {

                        $sql = "DELETE FROM $tbl_session_rel_course_rel_user

                                WHERE

                                    session_id = $id_session AND

                                    c_id = $courseId AND

                                    user_id = $existing_user AND

                                    status = 0 ";

                        $result = Database::query($sql);

                        Event::addEvent(

                            LOG_SESSION_DELETE_USER_COURSE,

                            LOG_USER_ID,

                            $existing_user,

                            api_get_utc_datetime(),

                            api_get_user_id(),

                            $courseId,

                            $id_session

                        );

                        if (Database::affected_rows($result)) {

                            $nbr_users--;

                        }

                    }

                }

            }

            // Replace with this new function

            // insert new users into session_rel_course_rel_user and ignore if they already exist

            // insert new users into session_rel_course_rel_user and ignore if they already exist

            foreach ($user_list as $enreg_user) {

                if (!in_array($enreg_user, $existingUsers)) {

                    $enreg_user = Database::escape_string($enreg_user);

                    $sql = "INSERT IGNORE INTO $tbl_session_rel_course_rel_user (session_id, c_id, user_id, visibility, status)

                            VALUES($id_session, $courseId, $enreg_user, $session_visibility, 0)";

                    $result = Database::query($sql);

                    Event::addEvent(

                        LOG_SESSION_ADD_USER_COURSE,

                        LOG_USER_ID,

                        $enreg_user,

                        api_get_utc_datetime(),

                        api_get_user_id(),

                        $courseId,

                        $id_session

                    );

                    if (Database::affected_rows($result)) {

                        $nbr_users++;

                    }

                }

            }

            // Count users in this session-course relation