通过xpath和所有子元素获取父元素 [英] Get parent element through xpath and all child elements

问题描述

好吧，假设我有一些这样的 XML...

Ok so let’s say I have some XML like this…

<blaah1 name="whatever">
<gender name="male">

<example1 baseurl="male/86644/">
<x u="lol.png"/>
<x u="haha.png"/>
<x u="name.png"/>
</example1>

<example2 baseurl="male/27827/">
<x u="page.png"/>
<x u="examp.png"/>
<x u="bottom.png"/>
</example2>

</gender>
</blaah1>

我需要怎么做才能在每个孩子的父级 baseurl 末尾显示 u="" 内容?

What do I need to do to display the u="" content on the end of the parent's baseurl for each child?

推荐答案

据我所知，您不能使用单个 xpath 表达式来做到这一点，但您需要遍历结果.这种循环的一个例子:

As far as I know, you can not do that with a single xpath expression but you would need to loop over the result. An example of such a loop:

$base = '';
foreach($xp->query('//@baseurl|//*[@baseurl]/x/@u') as $element) {
    $value = $element->value;
    if (substr($value, -1,1) === '/') {
        $base = $value;
    } else {
        echo $base, $value, "\n";
    }
}

使用您的示例 XML 文档:

With your example XML document:

male/86644/lol.png
male/86644/haha.png
male/86644/name.png
male/27827/page.png
male/27827/examp.png
male/27827/bottom.png

此示例使用联合运算符 | 一次获取所有想要的节点.

This example is using the union operator | to obtain all wanted nodes at once.

我最初是想在 xpath 中执行以下操作，但 AFAIK 是不可能的.但是 PHP 可以解决这个问题:在上下文中运行 Xpath 表达式到先前的 xpath 查询节点:

I was originally looking for doing the following within xpath but is not possible AFAIK. However PHP can take care of this: Run an Xpath expression in context to a previous xpath query nodes:

$array = array_map(function($context) use($xp) {
    return $xp->evaluate('concat(../../@baseurl, .)', $context);
}, iterator_to_array($xp->query('//x/@u')));

给 $array 然后:

Array
(
    [0] => male/86644/lol.png
    [1] => male/86644/haha.png
    [2] => male/86644/name.png
    [3] => male/27827/page.png
    [4] => male/27827/examp.png
    [5] => male/27827/bottom.png
)

这可能更直接.

这篇关于通过xpath和所有子元素获取父元素的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！