protected function section_header($section, $course, $onsectionpage, $sectionreturn=null) {
        global $PAGE;

        $o = '';
        $currenttext = '';
        $sectionstyle = '';

        if ($section->section != 0) {
            // Only in the non-general sections.
            if (!$section->visible) {
                $sectionstyle = ' hidden';
            }
            if (course_get_format($course)->is_section_current($section)) {
                $sectionstyle = ' current';
            }
        }

        $o.= html_writer::start_tag('li', array('id' => 'section-'.$section->section,
            'class' => 'section main clearfix'.$sectionstyle, 'role'=>'region',
            'aria-label'=> get_section_name($course, $section)));

        // Create a span that contains the section title to be used to create the keyboard section move menu.
        $o .= html_writer::tag('span', get_section_name($course, $section), array('class' => 'hidden sectionname'));

        $leftcontent = $this->section_left_content($section, $course, $onsectionpage);
        $o.= html_writer::tag('div', $leftcontent, array('class' => 'left side'));

        $rightcontent = $this->section_right_content($section, $course, $onsectionpage);
        $o.= html_writer::tag('div', $rightcontent, array('class' => 'right side'));
        $o.= html_writer::start_tag('div', array('class' => 'content'));

        // When not on a section page, we display the section titles except the general section if null
        $hasnamenotsecpg = (!$onsectionpage && ($section->section != 0 || !is_null($section->name)));

        // When on a section page, we only display the general section title, if title is not the default one
        $hasnamesecpg = ($onsectionpage && ($section->section == 0 && !is_null($section->name)));

        $classes = ' accesshide';
        if ($hasnamenotsecpg || $hasnamesecpg) {
            $classes = '';
        }
        $sectionname = html_writer::tag('span', $this->section_title($section, $course));
        $o.= $this->output->heading($sectionname, 3, 'sectionname' . $classes);

        $o .= $this->section_availability($section);

        $o .= html_writer::start_tag('div', array('class' => 'summary'));
        if ($section->uservisible || $section->visible) {
            // Show summary if section is available or has availability restriction information.
            // Do not show summary if section is hidden but we still display it because of course setting
            // "Hidden sections are shown in collapsed form".
            $o .= $this->format_summary_text($section);
        }
        $o .= html_writer::end_tag('div');

        return $o;
    }