PHP：从递归函数返回一个数组
发布时间：2020-12-13 13:33:53 所属栏目：PHP教程 来源：网络整理
导读：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] =
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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. 那么,你有两个错误. $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. 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. （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |