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/>.

/**
 * @package   mod_pdfannotator
 * @copyright 2018 RWTH Aachen (see README.md)
 * @author    Ahmad Obeid
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
require_once('../../config.php');
require_once('locallib.php');

$id = required_param('id', PARAM_INT);           // Course ID.

// Ensure that the course specified is valid.
if (!$course = $DB->get_record('course', array('id' => $id))) {
    print_error('Course ID is incorrect');
}
// $course = $DB->get_record('course', array('id'=>$id), '*', MUST_EXIST);
require_course_login($course, true);
$PAGE->set_pagelayout('incourse');

$params = array(
    'context' => context_course::instance($course->id)
);
$context = $params['context'];
$event = \mod_pdfannotator\event\course_module_instance_list_viewed::create($params);
$event->add_record_snapshot('course', $course);
$event->trigger();

$strpdfannotator     = get_string('modulename', 'pdfannotator');
$strpdfannotators    = get_string('modulenameplural', 'pdfannotator');
$strsectionname  = get_string('sectionname', 'format_'.$course->format);
$strname         = get_string('name');
$strintro        = get_string('moduleintro');
$strlastmodified = get_string('lastmodified');
$strsubscribe    = get_string('subscribe', 'pdfannotator');
$strunsubscribe  = get_string('unsubscribe', 'pdfannotator');
$strsubscribed   = get_string('subscribed', 'pdfannotator');
$stryes          = get_string('yes');
$strno           = get_string('no');

$PAGE->set_url('/mod/pdfannotator/index.php', array('id' => $course->id));
$PAGE->set_title($course->shortname.': '.$strpdfannotators);
$PAGE->set_heading($course->fullname);
$PAGE->navbar->add($strpdfannotators);
echo $OUTPUT->header();
echo $OUTPUT->heading($strpdfannotators);

if (!$pdfannotators = get_all_instances_in_course('pdfannotator', $course)) {
    notice(get_string('thereareno', 'moodle', $strpdfannotators), "$CFG->wwwroot/course/view.php?id=$course->id");
    exit;
}

$usesections = course_format_uses_sections($course->format);

$table = new html_table();