Общий форум

Мне нужно создать расширение блока Moodle, которое будет отображать пользователю время, проведенное им на курсах. Данные берутся из Attendance Register. Так вот, я пытаюсь рассчитать время, но все равно показывает 0, хотя Attendance Register указывает, что я провел 24 минуты. Что я делаю не так, почему вместо 24 мне показывает 0? Вот мой код:

<?php
defined('MOODLE_INTERNAL') || die();

class block_time_spent extends block_base {
    public function init() {
        $this->title = get_string('pluginname', 'block_time_spent');
    }

    public function get_content() {
        global $USER, $DB, $OUTPUT;

        if ($this->content !== null) {
            return $this->content;
        }

        $this->content = new stdClass();

        $filterCategory = optional_param('filterCategory', null, PARAM_INT);

        $courses = enrol_get_all_users_courses($USER->id);

        $chart = new \core\chart_pie();
        $labels = [];
        $timeSpentData = [];

        foreach ($courses as $course) {
            if (has_capability('mod/attendance:view', context_course::instance($course->id))) {
                if ($filterCategory !== null && $course->category != $filterCategory) {
                    continue;
                }

                $attendanceregisterRecord = $DB->get_record('attendanceregister', array('course' => $course->id));
                if ($attendanceregisterRecord) {
                    $totalDuration = 0;
                    $sessions = $DB->get_records('attendanceregister_session', array('register' => $attendanceregisterRecord->id, 'userid' => $USER->id));
                    if ($sessions) {
                        foreach ($sessions as $session) {
                            $totalDuration += $session->duration;
                        }
                    }

                    if ($filterCategory !== null) {
                        $label = $course->fullname;
                    } else {
                        $category = \core_course_category::get($course->category, IGNORE_MISSING);
                        $label = $category ? $category->get_formatted_name() : 'Unknown';
                    }

                    $index = array_search($label, $labels);
                    if ($index === false) {
                        $labels[] = $label;
                        $timeSpentData[] = $totalDuration;
                    } else {
                        $timeSpentData[$index] += $totalDuration;
                    }
                }
            }
        }

        $chart->set_labels($labels);
        $chart->add_series(new \core\chart_series(get_string('time_spent', 'block_time_spent'), $timeSpentData));

        // Add category filter form.
        $categoryFilterForm = html_writer::start_tag('form', array('action' => '', 'method' => 'get'));
        $categoryFilterForm .= html_writer::start_tag('div');
        $categoryFilterForm .= html_writer::label('Filter by category: ', 'filterCategory', false);
        $categoryFilterForm .= html_writer::select(\core_course_category::make_categories_list(), 'filterCategory', $filterCategory);
        $categoryFilterForm .= html_writer::empty_tag('input', array('type' => 'submit', 'value' => 'Filter'));
        $categoryFilterForm .= html_writer::end_tag('div');
        $categoryFilterForm .= html_writer::end_tag('form');

        $this->content->text = $categoryFilterForm;
        $this->content->text .= $OUTPUT->render($chart);

        return $this->content;
    }
}