根据以前的兄弟值，DOMXPath得到同级

问题描述

假设我有这个：

  c>  c  $ b 
  // foo [bar =AAA] / baz 
  
如果你不熟悉XPath表达式，为添加书签。
 
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.
                        
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