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类方法返回值,奇怪的现象

WBOY
WBOYOriginal
2016-06-23 14:02:111199Durchsuche

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。
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