addinstance.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/>.

/**
 * Adds new instance of enrol_guest to specified course.
 *
 * @package    enrol
 * @subpackage guest
 * @copyright  2010 Petr Skoda  {@link http://skodak.org}
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require('../../config.php');

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

$course = $DB->get_record('course', array('id'=>$id), '*', MUST_EXIST);
$context = get_context_instance(CONTEXT_COURSE, $course->id, MUST_EXIST);

require_login($course);
require_capability('moodle/course:enrolconfig', $context);
require_sesskey();

$enrol = enrol_get_plugin('guest');

if ($enrol->get_newinstance_link($course->id)) {
    $enrol->add_default_instance($course);
}

redirect(new moodle_url('/enrol/instances.php', array('id'=>$course->id)));