DOMXPath 根据前一个同级值获取同级
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，我想获取 baz 值，该值紧随 bar 之后，值为 AAA （！但是仅具有值AAA！）。我不知道我有多少个“foo”，所以我不能准确地写出这样的内容：
$element->item(0) // I don't know the exact number
那么我怎样才能获得 baz 的值，它跟在 bar 之后，具有特定的值？
（对于上面的示例，我想获得 sometext 因为它位于 AAA 之后）
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)
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有不同的方法来编写匹配的 XPath，具体取决于您希望如何执行匹配。这里有一些选项：
找到一个 baz，其中还有一个
AAA 查找前面为
AAA 查找立即 前面的 baz
AAA 查找
AAA There are different ways to write a matching XPath depending on exactly how you want the match to be performed. Here are some options:
Find a baz where there's also a
<bar>AAA</bar>, not necessarily preceding it though (it could come after, or there could be other elements in between):Find a baz preceded by
<bar>AAA</bar>:Find a baz immediately preceded by
<bar>AAA</bar>:Find a
<bar>AAA</bar>and return whatever element comes immediately after it, not necessarily named baz.基本查询是查找包含
AAA的bar，然后导航到相应的baz元素。或者，查找所有
baz并根据关联的bar进行过滤。或者，
baz位于foo中，其中包含具有AAA的bar。如果您不熟悉 XPath 表达式，请为 XML 路径语言 (XPath) 添加书签以供稍后使用。
A basic query would be to find the
bars that containAAA, then navigate to the correspondingbazelement.Or, find all
bazand filter based on the associatedbar.Or,
bazs withinfoos containingbarhavingAAA.If you're not familiar with XPath expressions, bookmark XML Path Language (XPath) for later.