类方法返回值，奇怪的现象
- WBOY原创
- 2016-06-23 14:02:111195浏览
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){
$strLable .= '
- ';
- '.$val['acc_code'].$val['acc_name'].' ';
foreach($arrData as $val){
if(is_array($val['child'])){
$this->accountTreeType1($val['child']);
}else{
$strLable .= '
}
}
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){
$strLable .= '
- ';
- '.$val['acc_code'].$val['acc_name'].' ';
- '.$val['acc_code'].$val['acc_name'].' ';
- 这个可以实现。谢谢你们，我有点明白，我错在哪了。
foreach($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 .= '
$strLable .= $this->accountTreeType1($val['child']);
}else{
$strLable .= '
}
}
return $strLable.'
}
public function accountTreeType1($arrData){
$strLable .= '
- ';
foreach($arrData as $val){
if(is_array($val['child'])){
$strLable .= '