C:/xampp/htdocs/moodle/enrol/manual/unenrolself.php

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<?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/>.

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

$enrolid = required_param('enrolid', PARAM_INT);
$confirm = optional_param('confirm', 0, PARAM_BOOL);

$instance = $DB->get_record('enrol', array('id'=>$enrolid, 'enrol'=>'manual'), '*', MUST_EXIST);
$course = $DB->get_record('course', array('id'=>$instance->courseid), '*', MUST_EXIST);
$context = get_context_instance(CONTEXT_COURSE, $course->id, MUST_EXIST);

require_login();
if (!is_enrolled($context)) {
    redirect(new moodle_url('/'));
}
require_login($course);

$plugin = enrol_get_plugin('manual');

// security defined inside following function
if (!$plugin->get_unenrolself_link($instance)) {
    redirect(new moodle_url('/course/view.php', array('id'=>$course->id)));
}

$PAGE->set_url('/enrol/manual/unenrolself.php', array('enrolid'=>$instance->id));
$PAGE->set_title($plugin->get_instance_name($instance));

if ($confirm and confirm_sesskey()) {
    $plugin->unenrol_user($instance, $USER->id);
    add_to_log($course->id, 'course', 'unenrol', '../enrol/users.php?id='.$course->id, $course->id); //there should be userid somewhere!
    redirect(new moodle_url('/index.php'));
}

echo $OUTPUT->header();
$yesurl = new moodle_url($PAGE->url, array('confirm'=>1, 'sesskey'=>sesskey()));
$nourl = new moodle_url('/course/view.php', array('id'=>$course->id));
$message = get_string('unenrolselfconfirm', 'enrol_manual', format_string($course->fullname));
echo $OUTPUT->confirm($message, $yesurl, $nourl);
echo $OUTPUT->footer();