类方法返回值，奇怪的现象

各位大侠，请看如下代码:
我要实现的功能是，利用一个多维数组输出一个树状结构，下面的参数是多维数组。

//递归树状输出格式一

	public function accountTreeType1($arrData){		$this->strLable = $this->strLable.'<ul>';		foreach($arrData as $val){			if(is_array($val['child'])){				$this->strLable = $this->strLable.'<li>'.$val['acc_code'].$val['acc_name'];				$this->accountTreeType1($val['child']);			}else{				$this->strLable = $this->strLable.'<li>'.$val['acc_code'].$val['acc_name'].'</li>';                                 if($val[id]=='最后一个ID')｛                                      return $this->strLable; //在这里没有返回值，不过用echo $this->strLable;是可以打印出来，但是返回值为空。                                 ｝			}		}		$this->strLable = $this->strLable.'</ul>';	}

回复讨论(解决方案)

第 9 行的 $this->accountTreeType1 没有承接第 14 行的返回

第 9 行的 $this->accountTreeType1 没有承接第 14 行的返回

那为什么echo 时，能打印呢

你是如何调用这个方法的？

function return了之后表示该方法已经运行完了，后面的代码都不会执行了。

$str = D('Account')->accountTreeType1($Data);

方法的最后加上
return $this->strLable;

1、class 里strLable定义了没？ 
2、return了 你不接收返回值你是要做什么？
3、echo 当然可以输出，你是不是没搞清楚什么是递归函数？

加了之后，有返回值了。但是不是很理解为什么这样写。

 public function accountTreeType1($arrData){
        $strLable .= '

';
        foreach($arrData as $val){
            if(is_array($val['child'])){
                $this->accountTreeType1($val['child']);
            }else{
                $strLable .= '
• '.$val['acc_code'].$val['acc_name'].'
';
            }
        }
        return $strLable.'

';
 }

你都不return 怎么获取值

你都不return 怎么获取值

我刚刚代码有return。只是搞不明白，什么时候return。而且在方法最后面加return，那它递归，每次调用都会return不是吗？

$val[id],id是什么？应该是$id或者"id"吧...所以根本不会返回$this->strLabel

return 是跳出当前方法 你刚才其实调用了当前function好几次  你递归没搞懂
你最好搞懂 
return back continue 和递归

public function accountTreeType1($arrData){
        $strLable .= '

';
        foreach($arrData as $val){
            if(is_array($val['child'])){
                $this->accountTre……
这个方法不能返回所有的值

$arrData 打印出来看看

Array
(
    [1] => Array
        (
            [id] => 1
            [acc_code] => 1001
            [acc_name] => 库存现金
            [acc_level] => 1
            [acc_detail] => 0
            [acc_parent_id] => 0
            [acc_root_id] => 1
            [acc_state] => 1
            [child] => Array
                (
                    [38] => Array
                        (
                            [id] => 38
                            [acc_code] => 100101
                            [acc_name] => 深圳现钞
                            [acc_level] => 2
                            [acc_detail] => 0
                            [acc_parent_id] => 1
                            [acc_root_id] => 1
                            [acc_state] => 1
                            [child] => Array
                                (
                                    [39] => Array
                                        (
                                            [id] => 39
                                            [acc_code] => 10010101
                                            [acc_name] => 詹军涛
                                            [acc_level] => 3
                                            [acc_detail] => 0
                                            [acc_parent_id] => 38
                                            [acc_root_id] => 1
                                            [acc_state] => 1
                                            [child] => Array
                                                (
                                                    [804] => Array
                                                        (
                                                            [id] => 804
                                                            [acc_code] => 1001010101
                                                            [acc_name] => fdsaf
                                                            [acc_level] => 4
                                                            [acc_detail] => 1
                                                            [acc_parent_id] => 39
                                                            [acc_root_id] => 1
                                                            [acc_state] => 1
                                                        )

                                                )

                                        )

                                    [40] => Array
                                        (
                                            [id] => 40
                                            [acc_code] => 10010102
                                            [acc_name] => 林全茂
                                            [acc_level] => 3
                                            [acc_detail] => 1
                                            [acc_parent_id] => 38
                                            [acc_root_id] => 1
                                            [acc_state] => 1
                                        )

                                    [41] => Array
                                        (
                                            [id] => 41
                                            [acc_code] => 10010103
                                            [acc_name] => 吴雪如
                                            [acc_level] => 3
                                            [acc_detail] => 1
                                            [acc_parent_id] => 38
                                            [acc_root_id] => 1
                                            [acc_state] => 1
                                        )

                                    [42] => Array
                                        (
                                            [id] => 42
                                            [acc_code] => 10010104
                                            [acc_name] => 关蓉
                                            [acc_level] => 3
                                            [acc_detail] => 1
                                            [acc_parent_id] => 38
                                            [acc_root_id] => 1
                                            [acc_state] => 1
                                        )

                                    [43] => Array
                                        (
                                            [id] => 43
                                            [acc_code] => 10010105
                                            [acc_name] => 胡振明
                                            [acc_level] => 3
                                            [acc_detail] => 1
                                            [acc_parent_id] => 38
                                            [acc_root_id] => 1
                                            [acc_state] => 1
                                        )

                                    [44] => Array
                                        (
                                            [id] => 44
                                            [acc_code] => 10010106
                                            [acc_name] => 黄锦雄
                                            [acc_level] => 3
                                            [acc_detail] => 1
                                            [acc_parent_id] => 38
                                            [acc_root_id] => 1
                                            [acc_state] => 1
                                        )

                                    [45] => Array
                                        (
                                            [id] => 45
                                            [acc_code] => 10010107
                                            [acc_name] => 陈培怀
                                            [acc_level] => 3
                                            [acc_detail] => 1
                                            [acc_parent_id] => 38
                                            [acc_root_id] => 1
                                            [acc_state] => 1
                                        )

                                    [46] => Array
                                        (
                                            [id] => 46
                                            [acc_code] => 10010108
                                            [acc_name] => 陈镇江
                                            [acc_level] => 3
                                            [acc_detail] => 1
                                            [acc_parent_id] => 38
                                            [acc_root_id] => 1
                                            [acc_state] => 1
                                        )

                                    [789] => Array
                                        (
                                            [id] => 789
                                            [acc_code] => 435435
                                            [acc_name] => fdsaf
                                            [acc_level] => 3
                                            [acc_detail] => 1
                                            [acc_parent_id] => 38
                                            [acc_root_id] => 1
                                            [acc_state] => 1
                                        )

                                )

                        )

                    [47] => Array
                        (
                            [id] => 47
                            [acc_code] => 100102
                            [acc_name] => 广州现钞
                            [acc_level] => 2
                            [acc_detail] => 0
                            [acc_parent_id] => 1
                            [acc_root_id] => 1
                            [acc_state] => 1
                            [child] => Array
                                (
                                    [48] => Array
                                        (
                                            [id] => 48
                                            [acc_code] => 10010201
                                            [acc_name] => 吴昆伦
                                            [acc_level] => 3
                                            [acc_detail] => 1
                                            [acc_parent_id] => 47
                                            [acc_root_id] => 1
                                            [acc_state] => 1
                                        )

                                )

                        )

                )

        )
）

 public function accountTreeType1($arrData){
        $strLable .= '

';
        foreach($arrData as $val){
            if(is_array($val['child'])){
                $strLable .= '
• '.$val['acc_code'].$val['acc_name'].'
';
                $strLable .= $this->accountTreeType1($val['child']);
            }else{
                $strLable .= '
• '.$val['acc_code'].$val['acc_name'].'
';
            }
        }
        return $strLable.'
';
 }

public function accountTreeType1($arrData){
        $strLable .= '

';
        foreach($arrData as $val){
            if(is_array($val['child'])){
                $strLable .= '
• 这个可以实现。谢谢你们，我有点明白，我错在哪了。