ThinkPHP中常用的无限级查找代理

项目中常用到无限级，所以把之前写的循环拿出来整理下，以后遇到省的调试

	//无限级查询上级
    public function getParent($uid = 0){
        
        if (!$this->find($uid)) {
            return [];
        }
        $pid = $this->where('id',$uid)->value('pid');
        if ($pid) {
            $this->res[] = $pid;
            $this->getParent($pid);
        }else return [];
        return $this->res;
    }
	
	//无限级向上查找最近等级的会员信息
    public function getLevelParent($uid = 0,$level = 0){
        if (!$this->find($uid)) {
            return [];
        }
        $parent = $this->where('id',$uid)->find();
        if ($parent['level'] >= $level) {
            return $parent;
        }else{
            return $this->getLevelParent($parent['pid'],$level);
        }
    }
    
	//查到无限极代理
    protected function getAgent($user_id)
    {
        $user = U::where('id', $user_id)->lock(true)->find();
        if (!$user) {
            return [];
        }
        if($user->isagent){
            return $user;
        }else{
            return $this->getAgent($user->pid);
        }
    }
    
	//获得伞下所有人
	public function getChild($id)
	{
		$childs = M('member')->where(array('parent_id'=>$id))->field('id')->select();;
		if (!$childs) {
			return [];
		}else{
			foreach($childs as $child){
				$this->childs[] = $child['id'];
				$this->getChild($child['id']);
			}
		}
		return $this->childs;
	}

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