Method usergroups

/**
 * Returns a UL list of user groups with checkboxes
 *
 * @param   string   $name             The name of the checkbox controls array
 * @param   array    $selected         An array of the checked boxes
 * @param   boolean  $checkSuperAdmin  If false only super admins can add to super admin groups
 *
 * @return  string
 *
 * @since   1.6
 */
public static function usergroups($name, $selected, $checkSuperAdmin = false)
{
    static $count;
    $count++;
    $isSuperAdmin = Factory::getUser()->authorise('core.admin');
    $groups = array_values(UserGroupsHelper::getInstance()->getAll());
    $html = array();
    for ($i = 0, $n = count($groups); $i < $n; $i++) {
        $item =& $groups[$i];
        // If checkSuperAdmin is true, only add item if the user is superadmin or the group is not super admin
        if (!$checkSuperAdmin || $isSuperAdmin || !AccessCheck::checkGroup($item->id, 'core.admin')) {
            // Setup  the variable attributes.
            $eid = $count . 'group_' . $item->id;
            // Don't call in_array unless something is selected
            $checked = '';
            if ($selected) {
                $checked = in_array($item->id, $selected) ? ' checked="checked"' : '';
            }
            $rel = $item->parent_id > 0 ? ' rel="' . $count . 'group_' . $item->parent_id . '"' : '';
            // Build the HTML for the item.
            $html[] = '	<div class="control-group">';
            $html[] = '		<div class="controls">';
            $html[] = '			<label class="form-check-label checkbox" for="' . $eid . '">';
            $html[] = '			<input class="form-check-input" type="checkbox" name="' . $name . '[]" value="' . $item->id . '" id="' . $eid . '"';
            $html[] = '					' . $checked . $rel . '>';
            $html[] = '			' . LayoutHelper::render('joomla.html.treeprefix', array('level' => $item->level + 1)) . $item->title;
            $html[] = '			</label>';
            $html[] = '		</div>';
            $html[] = '	</div>';
        }
    }
    return implode("\n", $html);
}