类方法返回值，奇怪的现象

Question

本帖最后由 xuzuning 于 2013-03-08 14:59:52 编辑

Answer 1

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

Answer 2

那为什么echo 时，能打印呢

Answer 3

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。

Answer 4

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

Answer 5

方法的最后加上
return $this->strLable;

Answer 6

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？

Answer 7

 public function accountTreeType1($arrData){
        $strLable .= '<ul>';
        foreach($arrData as $val){
            if(is_array($val['child'])){
                $this->accountTreeType1($val['child']);
            }else{
                $strLable .= '<li>'.$val['acc_code'].$val['acc_name'].'</li>';
            }
        }
        return $strLable.'</ul>';
 }

Answer 8

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？

Answer 9

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

Answer 10

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

Answer 11

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
                                        )                                )                        )                )        )
）

Answer 12

 public function accountTreeType1($arrData){
        $strLable .= '<ul>';
        foreach($arrData as $val){
            if(is_array($val['child'])){
                $strLable .= '<li>'.$val['acc_code'].$val['acc_name'].'</li>';
                $strLable .= $this->accountTreeType1($val['child']);
            }else{
                $strLable .= '<li>'.$val['acc_code'].$val['acc_name'].'</li>';
            }
        }
        return $strLable.'</ul>';
 }