C:/xampp/htdocs/moodle/course/editsection.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");
require_once($CFG->libdir.'/filelib.php');
require_once('editsection_form.php');

$id = required_param('id',PARAM_INT);    // Week/topic ID

$PAGE->set_url('/course/editsection.php', array('id'=>$id));

$section = $DB->get_record('course_sections', array('id' => $id), '*', MUST_EXIST);
$course = $DB->get_record('course', array('id' => $section->course), '*', MUST_EXIST);

require_login($course);
$context = get_context_instance(CONTEXT_COURSE, $course->id);
require_capability('moodle/course:update', $context);

$editoroptions = array('context'=>$context ,'maxfiles' => EDITOR_UNLIMITED_FILES, 'maxbytes'=>$CFG->maxbytes, 'trusttext'=>false, 'noclean'=>true);
$section = file_prepare_standard_editor($section, 'summary', $editoroptions, $context, 'course', 'section', $section->id);
$section->usedefaultname = (is_null($section->name));
$mform = new editsection_form(null, array('course'=>$course, 'editoroptions'=>$editoroptions));
$mform->set_data($section); // set current value

if ($mform->is_cancelled()){
    redirect($CFG->wwwroot.'/course/view.php?id='.$course->id);

} else if ($data = $mform->get_data()) {
    if (empty($data->usedefaultname)) {
        $section->name = $data->name;
    } else {
        $section->name = null;
    }
    $data = file_postupdate_standard_editor($data, 'summary', $editoroptions, $context, 'course', 'section', $section->id);
    $section->summary = $data->summary;
    $section->summaryformat = $data->summaryformat;
    $DB->update_record('course_sections', $section);
    add_to_log($course->id, "course", "editsection", "editsection.php?id=$section->id", "$section->section");
    $PAGE->navigation->clear_cache();
    redirect("view.php?id=$course->id");
}

$sectionname  = get_section_name($course, $section);
$stredit      = get_string('edita', '', " $sectionname");
$strsummaryof = get_string('summaryof', '', " $sectionname");

$PAGE->set_title($stredit);
$PAGE->set_heading($course->fullname);
$PAGE->navbar->add($stredit);
echo $OUTPUT->header();

echo $OUTPUT->heading($strsummaryof);

$mform->display();
echo $OUTPUT->footer();