settings.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Settings that allow different methods for image placement.
 *
 * @package   report_editdates
 * @copyright 2011 The Open University
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

if ($ADMIN->fulltree) {

    $options = [
        0 => get_string('timelinedonotshow', 'report_editdates'),
        1 => 1,
        2 => 2,
        3 => 3,
        4 => 4,
        5 => 5,
    ];
    $settings->add(new admin_setting_configselect('report_editdates/timelinemax',
            get_string('timelinemax', 'report_editdates'),
            get_string('timelinemaxdesc', 'report_editdates'),
            3,
            $options));
}