根据以前的兄弟值，DOMXPath得到同级 [英] DOMXPath get sibling depending on previous sibling value

问题描述

假设我有这个：

 < foo> 
< bar> CCC< / bar> 
< baz> sometexthere< / baz> 
< / foo> 
< foo> 
< bar> AAA< / bar> 
< baz> sometext< / baz> 
< / foo> 
< foo> 
< bar> DDD< / bar> 
< baz> something< / baz> 
< / foo> 
  

现在，我想获得正确的 baz 值在栏之后，值 AAA （！但只有值 AAA ！）。我不知道我有多少foo，所以我不能写出如下的东西：

  $ element - > item（0）//我不知道确切的数字
  

那么我怎么能得到具有特定值的bar之后的baz的值？

（对于上面的示例，我想获得 sometext 因为它是在 AAA 之后）

解决方案

一个基本的查询将是找到 bar s包含 AAA ，然后导航到相应的 baz 元素。 / p>

  // foo / bar [。=AAA] /../ baz 
  

或者，找到所有 baz 并根据相关的栏进行过滤。

  // foo / baz [../ bar =AAA] 
  

或 baz 包含 c> c c $ b

  // foo [bar =AAA] / baz 
  

如果你不熟悉XPath表达式，为 XML路径语言（XPath）添加书签。

Let's say I have this:

<foo>
    <bar>CCC</bar>
    <baz>sometexthere</baz>
</foo>
<foo>
    <bar>AAA</bar>
    <baz>sometext</baz>
</foo>
<foo>
    <bar>DDD</bar>
    <baz>something</baz>
</foo>

Now, I want to get the baz value, which is coming right after bar with the value AAA (!but only with the value AAA!). I don't know how many "foo"s I have, so I can't exactly write something like:

$element->item(0) // I don't know the exact number

So how can I get the value of the baz, which follows after bar with a particular value?

(For the example above, I would like to get sometext because it comes after AAA)

解决方案

A basic query would be to find the bars that contain AAA, then navigate to the corresponding baz element.

//foo/bar[.="AAA"]/../baz

Or, find all baz and filter based on the associated bar.

//foo/baz[../bar = "AAA"]

Or, bazs within foos containing bar having AAA.

//foo[bar="AAA"]/baz

If you're not familiar with XPath expressions, bookmark XML Path Language (XPath) for later.

这篇关于根据以前的兄弟值，DOMXPath得到同级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！