view.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/>.

/**
 * Prints a particular instance of multipage
 *
 * @package    mod_multipage
 * @copyright  2016 Richard Jones <richardnz@outlook.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 * @see https://github.com/moodlehq/moodle-mod_newmodule
 *
 */

// Replace multipage with the name of your module and remove this line.

require_once(dirname(dirname(dirname(__FILE__))).'/config.php');
require_once(dirname(__FILE__).'/lib.php');

$id = optional_param('id', 0, PARAM_INT); // Course_module ID, or
$n  = optional_param('n', 0, PARAM_INT);  // ... multipage instance ID - it should be named as the first character of the module.

if ($id) {
    $cm         = get_coursemodule_from_id('multipage', $id, 0, false, MUST_EXIST);
    $course     = $DB->get_record('course', array('id' => $cm->course), '*', MUST_EXIST);
    $multipage  = $DB->get_record('multipage', array('id' => $cm->instance), '*', MUST_EXIST);
} else if ($n) {
    $multipage  = $DB->get_record('multipage', array('id' => $n), '*', MUST_EXIST);
    $course     = $DB->get_record('course', array('id' => $multipage->course), '*', MUST_EXIST);
    $cm         = get_coursemodule_from_instance('multipage', $multipage->id, $course->id, false, MUST_EXIST);
} else {
    error('You must specify a course_module ID or an instance ID');
}

require_login($course, true, $cm);
$modulecontext = context_module::instance($cm->id);

// Log the module viewed event
$event = \mod_multipage\event\course_module_viewed::create(array(
    'objectid' => $PAGE->cm->instance,
    'context' => $PAGE->context,
));

$event->add_record_snapshot('course', $PAGE->course);
$event->add_record_snapshot($PAGE->cm->modname, $multipage);
$event->trigger();

//Set completion
//if we got this far, we can consider the activity "viewed"
$completion = new completion_info($course);
$completion->set_module_viewed($cm);

// Print the page header.
$PAGE->set_url('/mod/multipage/view.php', array('id' => $cm->id));
//$PAGE->set_title(format_string($multipage->name));
//$PAGE->set_heading(format_string($course->fullname));

// Output starts here.
//echo $OUTPUT->header();

$renderer = $PAGE->get_renderer('mod_multipage');
echo $renderer->header($multipage->name, $course->fullname);

// Output the introduction as the first page
if ($multipage->intro) {
    echo $renderer->fetch_intro($multipage, $cm->id);
}

//if we are teacher we see links.
if(has_capability('mod/multipage:manage',
    $modulecontext)) {
    echo $renderer->fetch_editing_links();
}

// Replace the following lines with your own code.
echo $OUTPUT->heading('Yay! It works on Franks PC!');

// Finish the page.
echo $OUTPUT->footer();