C:/xampp/htdocs/moodle/admin/message.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(dirname(__FILE__) . '/../config.php');
require_once($CFG->dirroot . '/message/lib.php');
require_once($CFG->libdir.'/adminlib.php');

// This is an admin page
admin_externalpage_setup('managemessageoutputs');

// Require site configuration capability
require_capability('moodle/site:config', get_context_instance(CONTEXT_SYSTEM));

// Get the submitted params
$disable    = optional_param('disable', 0, PARAM_INT);
$enable     = optional_param('enable', 0, PARAM_INT);

if (!empty($disable) && confirm_sesskey()) {
    if (!$processor = $DB->get_record('message_processors', array('id'=>$disable))) {
        print_error('outputdoesnotexist', 'message');
    }
    $DB->set_field('message_processors', 'enabled', '0', array('id'=>$processor->id));      // Disable output
}

if (!empty($enable) && confirm_sesskey() ) {
    if (!$processor = $DB->get_record('message_processors', array('id'=>$enable))) {
        print_error('outputdoesnotexist', 'message');
    }
    $DB->set_field('message_processors', 'enabled', '1', array('id'=>$processor->id));      // Enable output
}

if ($disable || $enable) {
    $url = new moodle_url('message.php');
    redirect($url);
}
// Page settings
$PAGE->set_context(get_context_instance(CONTEXT_SYSTEM));

// Grab the renderer
$renderer = $PAGE->get_renderer('core', 'message');

// Display the manage message outputs interface
$processors = get_message_processors();
$messageoutputs = $renderer->manage_messageoutputs($processors);

// Display the page
echo $OUTPUT->header();
echo $OUTPUT->heading(get_string('managemessageoutputs', 'message'));
echo $messageoutputs;
echo $OUTPUT->footer();