Method usergroup

/**
 * Displays a list of the available user groups.
 *
 * @param   string   $name      The form field name.
 * @param   string   $selected  The name of the selected section.
 * @param   string   $attribs   Additional attributes to add to the select field.
 * @param   boolean  $allowAll  True to add "All Groups" option.
 * @param   mixed    $id        The form field id
 *
 * @return  string   The required HTML for the SELECT tag.
 *
 * @see     \Joomla\CMS\Form\Field\UsergrouplistField
 * @since   1.6
 */
public static function usergroup($name, $selected, $attribs = '', $allowAll = true, $id = false)
{
    $options = array_values(UserGroupsHelper::getInstance()->getAll());
    for ($i = 0, $n = count($options); $i < $n; $i++) {
        $options[$i]->value = $options[$i]->id;
        $options[$i]->text = str_repeat('- ', $options[$i]->level) . $options[$i]->title;
    }
    // If all usergroups is allowed, push it into the array.
    if ($allowAll) {
        array_unshift($options, HTMLHelper::_('select.option', '', Text::_('JOPTION_ACCESS_SHOW_ALL_GROUPS')));
    }
    return HTMLHelper::_('select.genericlist', $options, $name, array('list.attr' => $attribs, 'list.select' => $selected, 'id' => $id));
}