我有一个像这样的数组：
SimpleXMLElement Object
(
[BrowseNodes] => SimpleXMLElement Object
(
[BrowseNode] => SimpleXMLElement Object
(
[BrowseNodeId] => 969391031
[Name] => Bambine e ragazze
[Children] => SimpleXMLElement Object
(
[BrowseNode] => Array
(
[0] => SimpleXMLElement Object
(
[BrowseNodeId] => 969394031
[Name] => Calze
)
[1] => SimpleXMLElement Object
(
[BrowseNodeId] => 3635837031
[Name] => Felpe
)
[2] => SimpleXMLElement Object
(
[BrowseNodeId] => 3635838031
[Name] => Giacche
)
[3] => SimpleXMLElement Object
(
[BrowseNodeId] => 3635839031
[Name] => Guanti da giocatore
)
[4] => SimpleXMLElement Object
(
[BrowseNodeId] => 969392031
[Name] => Maglie
)
[5] => SimpleXMLElement Object
(
[BrowseNodeId] => 4351854031
[Name] => Maglie per tifosi
)
[6] => SimpleXMLElement Object
(
[BrowseNodeId] => 3635840031
[Name] => Magliette da portiere
)
[7] => SimpleXMLElement Object
(
[BrowseNodeId] => 969393031
[Name] => Pantaloncini
)
[8] => SimpleXMLElement Object
(
[BrowseNodeId] => 3635841031
[Name] => Pantaloncini da portiere
)
[9] => SimpleXMLElement Object
(
[BrowseNodeId] => 3635842031
[Name] => Pantaloni
)
[10] => SimpleXMLElement Object
(
[BrowseNodeId] => 3635843031
[Name] => Tute da ginnastica
)
)
)
[Ancestors] => SimpleXMLElement Object
(
[BrowseNode] => SimpleXMLElement Object
(
[BrowseNodeId] => 969386031
[Name] => Abbigliamento
[Ancestors] => SimpleXMLElement Object
(
[BrowseNode] => SimpleXMLElement Object
(
[BrowseNodeId] => 937258031
[Name] => Calcio
[Ancestors] => SimpleXMLElement Object
(
[BrowseNode] => SimpleXMLElement Object
(
[BrowseNodeId] => 524013031
[Name] => Categorie
[IsCategoryRoot] => 1
[Ancestors] => SimpleXMLElement Object
(
[BrowseNode] => SimpleXMLElement Object
(
[BrowseNodeId] => 524012031
[Name] => Sport e tempo libero
)
)
)
)
)
)
)
)
)
)
)
我需要做的是使用Anchestors构建一个面包屑.列表末尾的那个应该是第一个.所以,作为一个例子：
Sport e tempo libero>分类> CALCIO …
我试图用这种方式迭代xml而没有成功：
$rec=$result->BrowseNodes->BrowseNode->Ancestors->BrowseNode;
$bread=array();
function recursive($r)
{
do{
$bread[]=$r->BrowseNodeId;
recursive($r->Ancestors->BrowseNode);
}while(isset($r->Ancestors));
$bread=array_reverse($bread);
return $bread;
}
print_r(recursive($rec));
我在stackoverflow上发现了类似的东西,但没有任何建议帮助我解决这个问题.
要使用输出创建递归函数,您需要三件事：
>用于保存当前位置的变量或参数,即代码中的$r.
你有这个权利.
>保存结果的变量或参数,您没有.
起初它似乎是$bread,但它没有保持任何值,因为每次调用recursive()时它都是空的.
一个简单的解决方案是在函数内声明它是全局的.
> if语句,用于检查您没有的停止条件.
相反,您的代码中有一个do-while循环.
那么,你有两个错误.
根据您的代码并尽可能少地修改它,这是正确的代码：
$rec = $result->BrowseNodes->BrowseNode->Ancestors->BrowseNode;
$bread = array();
function recursive($r)
{
global $bread;
$bread[] = strval($r->BrowseNodeId);
if(isset($r->Ancestors)){
return recursive($r->Ancestors->BrowseNode);
}else{
return array_reverse($bread);
}
}
print_r(recursive($rec));
你去吧
更新：我同意@FlameStorm,如果可能,应该避免全局.
我也收到了使用static的建议,但它引入了一个bug.
因此,如果您不确定如何使用它,我建议也避免静电.
这是改进的代码：
$rec = $result->BrowseNodes->BrowseNode->Ancestors->BrowseNode;
function recursive($r)
{
if(isset($r->Ancestors))
$bread = recursive($r->Ancestors->BrowseNode);
$bread[] = strval($r->BrowseNodeId);
return $bread;
}
print_r(recursive($rec));
不再需要函数外部的$bread变量.此外,既不使用全局也不使用静态.
