public function get_samples($sampleids) {
        global $DB;

        $enrolments = enrol_get_course_users(false, false, array(), $sampleids);

        // Some course enrolments.
        list($enrolsql, $params) = $DB->get_in_or_equal($sampleids, SQL_PARAMS_NAMED);

        $samplesdata = array();
        foreach ($enrolments as $userenrolmentid => $user) {

            $sampleid = $userenrolmentid;
            $samplesdata[$sampleid]['user_enrolments'] = (object)array(
                'id' => $user->ueid,
                'status' => $user->uestatus,
                'enrolid' => $user->ueenrolid,
                'userid' => $user->id,
                'timestart' => $user->uetimestart,
                'timeend' => $user->uetimeend,
                'modifierid' => $user->uemodifierid,
                'timecreated' => $user->uetimecreated,
                'timemodified' => $user->uetimemodified
            );
            unset($user->ueid);
            unset($user->uestatus);
            unset($user->ueenrolid);
            unset($user->uetimestart);
            unset($user->uetimeend);
            unset($user->uemodifierid);
            unset($user->uetimecreated);
            unset($user->uetimemodified);

            // Enrolment samples are grouped by the course they belong to, so all $sampleids belong to the same
            // course, $courseid and $coursemodinfo will only query the DB once and cache the course data in memory.
            $courseid = $this->get_sample_courseid($sampleid);
            $coursemodinfo = get_fast_modinfo($courseid);
            $coursecontext = \context_course::instance($courseid);

            $samplesdata[$sampleid]['course'] = $coursemodinfo->get_course();
            $samplesdata[$sampleid]['context'] = $coursecontext;
            $samplesdata[$sampleid]['user'] = $user;

            // Fill the cache.
            $this->samplecourses[$sampleid] = $coursemodinfo->get_course()->id;
        }

        $enrolids = array_keys($samplesdata);
        return array(array_combine($enrolids, $enrolids), $samplesdata);
    }