在Moodle活动模块中过滤和搜索选项

Question

In my very simple new activity module in Moodle I need to add filter and search options for the table with users and the columns with user data.

We have two tabs Userlist and Add. In the first tab we have table, which shows username timepickedup timereturn cartype city status. And lists the userdata bellow these columns. The code is as follows:

$rows = carhiring_users($cm->id);

foreach ($rows as $carpicker) {
    $data = array();
    $user = carhiring_get_user($carpicker->userid);
    $data[] = $carpicker->cartype;
    $data[] = date('d.m.Y H:i', strtotime($carpicker->datepick));
    $data[] = date('d.m.Y H:i', strtotime($carpicker->datereturn));
    $data[] = $user->firstname . " " . $user->lastname;
    $data[] = $carpicker->city;
    $datetime1 = strtotime($carpicker->datepick);
    $datetime2 = strtotime($carpicker->datereturn);
    $interval = $datetime2 - $datetime1;
    $data[] = max(1, floor($interval/(60*60*24))) . get_string('carhiring_days', 'carhiring');
    switch ($carpicker->carhiring_status) {
            case 1:
                $carhiring_status = get_string('booked', 'carhiring');
                break;
            case 2:
                $carhiring_status = get_string('bookedbutdamaged', 'carhiring');
                break;
            case 3:
                $carhiring_status = get_string('returned', 'carhiring');
                break;
    }
    $data[] = $carhiring_status;
    $table->add_data($data);
}

We add users trough the second tab Add, where we can choose the user from the users in the Moodle site and manually add the rest of custom data.

I didn't find any search or filter forms for developers in Moodle. How should such form be structured in order to work in Moodle? If it is possible, I need to put it above the table, not in separate tab.