问PHP递归树形视图生成器是否只从填充的“选定”数组中选择一个选项？

EN

public function genTree($tree, $selectedValues = [1,2,3,4])
{
    $output = '<ul class="treeview">';

    foreach($tree as $arr)
    {
        $output .= '<li>';

        foreach($selectedValues as $num)
        {
            if ($num == $arr['id'])
            {
                $output .= '<input checked type="checkbox" id="'.$arr['name'].'" name="selected[]" value="'.$arr['id'].'"></input>';
            } else {
                $output .= '<input type="checkbox" id="'.$arr['name'].'" name="selected[]" value="'.$arr['id'].'"></input>';    
            }
        }

        $output .= '<label for"'.$arr['name'].'">'.ucfirst($arr['name']).'</label>';    

        if (isset($arr['children']) && count($arr['children']) > 0)
        {       
            $output .= $this->genTree($arr['children'], $selectedValues);   
        }
        $output .= '</li>';
    }
    $output .= '</ul>';

    return $output;
}