php 无限分类获取子类

public function getAllNextId($id,$data=[]){
    $pids = DB::name(‘Category‘)->where(‘pid‘,$id)->column(‘id‘);
    if(count($pids)>0){
        foreach($pids as $v){
            $data[] = $v;
            $data = $this->getAllNextId($v,$data); //注意写$data 返回给上级
        }
    }
    if(count($data)>0){
            return $data;
        }else{
            return false;
        }
}