C:/xampp/htdocs/moodle/mod/forum/unsubscribeall.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_once("../../config.php");
require_once("lib.php");

$confirm = optional_param('confirm', false, PARAM_BOOL);

$PAGE->set_url('/mod/forum/unsubscribeall.php');
$PAGE->set_context(get_context_instance(CONTEXT_USER, $USER->id));

// Do not autologin guest. Only proper users can have forum subscriptions.
require_login(null, false);

$return = $CFG->wwwroot.'/';

if (isguestuser()) {
    redirect($return);
}

$strunsubscribeall = get_string('unsubscribeall', 'forum');
$PAGE->navbar->add(get_string('modulename', 'forum'));
$PAGE->navbar->add($strunsubscribeall);
$PAGE->set_title($strunsubscribeall);
$PAGE->set_heading(format_string($COURSE->fullname));
echo $OUTPUT->header();
echo $OUTPUT->heading($strunsubscribeall);

if (data_submitted() and $confirm and confirm_sesskey()) {
    $DB->delete_records('forum_subscriptions', array('userid'=>$USER->id));
    $DB->set_field('user', 'autosubscribe', 0, array('id'=>$USER->id));
    echo $OUTPUT->box(get_string('unsubscribealldone', 'forum'));
    echo $OUTPUT->continue_button($return);
    echo $OUTPUT->footer();
    die;

} else {
    $a = $DB->count_records('forum_subscriptions', array('userid'=>$USER->id));

    if ($a) {
        $msg = get_string('unsubscribeallconfirm', 'forum', $a);
        echo $OUTPUT->confirm($msg, new moodle_url('unsubscribeall.php', array('confirm'=>1)), $return);
        echo $OUTPUT->footer();
        die;

    } else {
        echo $OUTPUT->box(get_string('unsubscribeallempty', 'forum'));
        echo $OUTPUT->continue_button($return);
        echo $OUTPUT->footer();
        die;
    }
}