有没有办法在DOMNode上执行xpath查询？或至少将其转换为DOMXPath？
<html>
...
<div id="content">
...
<div class="listing">
...
<div></div>
<div></div>
<div class='foo'>
<h3>Get me 1</h3>
<a>and me too 1</a>
</div>
</div>
<div class="listing">
...
<div></div>
<div></div>
<div class='foo'>
<h3>Get me 2</h3>
<a>and me too 1</a>
</div>
</div>
....
</div>
</html>
这是我的代码我正在尝试获取一个数组的列表,其中包含h3的值和每个数组中的一个标签.为此,我需要获得每个列表,然后在每个列表中获取h3和标签的值.
$html_dom = new DOMDocument();
@$html_dom->loadHTML($html);
$x_path = new DOMXPath($html_dom);
$nodes= $x_path->query("//div[@id='content']//div[@class='listing']");
foreach ($nodes as $node)
{
// I want to further dig down here using query on a DOMNode
}
将节点作为第二个参数传递给
DOMXPath::query
contextnode: The optional contextnode can be specified for doing relative XPath queries. By default,the queries are relative to the root element.
例：
foreach ($nodes as $node) {
foreach ($x_path->query('h3|a',$node) as $child) {
echo $child->nodeValue,PHP_EOL;
}
}
这使用UNION operator的结果
Get me 1 and me too 1 Get me 2 and me too 1
如果你不需要任何复杂的查询,你也可以做
foreach ($nodes as $node) {
foreach ($node->getElementsByTagName('a') as $a) {
echo $a->nodeValue,PHP_EOL;
}
}
或者甚至通过迭代子节点(请注意,这包括所有文本节点)
foreach ($nodes as $node) {
foreach ($node->childNodes as $child) {
echo $child->nodeName,PHP_EOL;
}
}
但是,所有这些都是不必要的,因为您可以直接获取这些节点：
$nodes= $x_path->query("/html/body//div[@class='listing']/div[last()]");
foreach ($nodes as $i => $node) {
echo $i,$node->nodeValue,PHP_EOL;
}
将给所有div的最后一个div子节点中的两个节点列出一个类属性值,并输出组合的文本节点值,包括空格
0
Get me 1
and me too 1
1
Get me 2
and me too 1
同样,以下
"//div[@class='listing']/div[last()]/node()[name() = 'h3' or name() = 'a']"
将给你四个孩子H3和A节点并输出
0Get me 1 1and me too 1 2Get me 2 3and me too 1
如果您需要通过名称来区分这些名称,然后迭代它们就可以
foreach ($nodes as $i => $node) {
echo $i,$node->nodeName,PHP_EOL;
}
然后给予
0h3Get me 1 1aand me too 1 2h3Get me 2 3aand me too 1