index.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/>.

/**
 * This is a one-line short description of the file
 *
 * You can have a rather longer description of the file as well,
 * if you like, and it can span multiple lines.
 *
 * @package    mod_newsletter
 * @copyright  2013 Ivan Šakić <ivan.sakic3@gmail.com>
 * @copyright  2015 onwards David Bogner <info@edulabs.org>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require_once(dirname(dirname(dirname(__FILE__))).'/config.php');
require_once($CFG->dirroot . '/mod/newsletter/lib.php');

$id = required_param('id', PARAM_INT);

if (!$course = $DB->get_record("course", array("id" => $id))) {
    throw new \moodle_exception('invalidcourseid');
}
require_login($course);

$PAGE->set_url('/mod/newsletter/index.php');

echo $OUTPUT->header();
echo $OUTPUT->heading(get_string('modulenameplural', 'mod_newsletter'), 2);
echo "Content goes here";
echo $OUTPUT->footer();