xpath 查询到 xpath 查询结果 [英] xpath query to xpath result of query
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问题描述
例如我们有这个xml:
for example we have this xml:
<body>
<a>
<b>
<c>hello</c>
<c>world</c>
</b>
</a>
<a>
<b>
<c>another hello</c>
<c>world</c>
</b>
</a>
</body>
通过 Xpath 查询，我们可以找到所有B"标签.但是我们需要在每个找到的B"标签中找到所有的C"标签.我写了这段代码:
by Xpath query we can find all "B"-tags. But then we need to find all "C"-tags in every found "B"-tag. I wrote this code:
$dom = new DOMDocument();
$dom->loadXML($xml);
$xpath = new DOMXPath($dom);
$btags = $xpath->query("//b");
foreach ($btags as $b)
{
$ctags = $xpath->query("/b/c", $b);
foreach ($ctags as $c) {
echo $c->nodeValue;
}
}
但它不起作用.可以用 XPath 查询来做到这一点吗?
But it doesn't work. It possible to do this with XPath query's?
推荐答案
对于你的第二个 XPath，试试这个:$ctags = $xpath->query("c", $b);
For your second XPath, try this instead: $ctags = $xpath->query("c", $b);
第二个 XPath 已经相对于 'b' 节点...如果我没记错的话，PHP XPath 语句中的相对路径要求您省略前导的 '/'.
This second XPath is already relative to the 'b' node...if I'm not mistaken, relative pathing in PHP XPath statements requires that you omit the leading '/'.
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