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Php Xpath - 如何在子节点中获取两个信息
[英] Php Xpath - How to get two information in a child node
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问题描述
如何在xpath中获取以下信息?
文本 01 - link_1.com
文本 02 - link_2.com
$page = '<div class="新闻"><div class="内容"><div><span class="title">文本 01</span><span class="link">link_1.com</span>
<div class="内容"><div><span class="title">文本 02</span><span class="link">link_2.com</span>
';@$this->dom->loadHTML($page);$xpath = new DOMXPath($this->dom);//执行步骤#1$childElements = $xpath->query("///*[@class='content']");$lista = '';foreach ($childElements 作为 $child) {//执行步骤#2$textChildren = $xpath->query("///*[@class='title']", $child);foreach ($textChildren as $n) {echo $n->nodeValue.'
';}$linkChildren = $xpath->query("///*[@class='link']", $child);foreach ($linkChildren as $n) {echo $n->nodeValue.'
';}}
我的结果回来了
文本 01
文字 02
link_1.com
link_2.com
文本 01
文字 02
link_1.com
link_2.com
解决方案
在第二个和第三个 xpath 中将 // 替换为 descendant::，因为 // 告诉 xpath 在 xml 中的任何地方搜索此元素，而不是在特定节点(根据需要)，并且 $child 不是单独的 XML.descendat:: 表示任意子节点
@$this->dom->loadHTML($page);$xpath = new DOMXPath($this->dom);//执行步骤#1$childElements = $xpath->query("///*[@class='content']");$lista = '';foreach ($childElements 作为 $child) {//执行步骤#2$textChildren = $xpath->query("descendant::*[@class='title']", $child);foreach ($textChildren as $n) {echo $n->nodeValue.'
';}$linkChildren = $xpath->query("descendant::*[@class='link']", $child);foreach ($linkChildren as $n) {echo $n->nodeValue.'
';}}
How can I get the following information in xpath?
Text 01 - link_1.com
Text 02 - link_2.com
$page = '
<div class="news">
<div class="content">
<div>
<span class="title">Text 01</span>
<span class="link">link_1.com</span>
</div>
</div>
<div class="content">
<div>
<span class="title">Text 02</span>
<span class="link">link_2.com</span>
</div>
</div>
</div>';
@$this->dom->loadHTML($page);
$xpath = new DOMXPath($this->dom);
// perform step #1
$childElements = $xpath->query("//*[@class='content']");
$lista = '';
foreach ($childElements as $child) {
// perform step #2
$textChildren = $xpath->query("//*[@class='title']", $child);
foreach ($textChildren as $n) {
echo $n->nodeValue.'<br>';
}
$linkChildren = $xpath->query("//*[@class='link']", $child);
foreach ($linkChildren as $n) {
echo $n->nodeValue.'<br>';
}
}
My result is returning
Text 01
Text 02
link_1.com
link_2.com
Text 01
Text 02
link_1.com
link_2.com
解决方案
Replace // by descendant:: in second and third xpath, because // tells xpath to search this element evrywhere in xml and not in specific node (as you need), and $child is NOT separate XML. descendat:: means any child node
@$this->dom->loadHTML($page);
$xpath = new DOMXPath($this->dom);
// perform step #1
$childElements = $xpath->query("//*[@class='content']");
$lista = '';
foreach ($childElements as $child) {
// perform step #2
$textChildren = $xpath->query("descendant::*[@class='title']", $child);
foreach ($textChildren as $n) {
echo $n->nodeValue.'<br>';
}
$linkChildren = $xpath->query("descendant::*[@class='link']", $child);
foreach ($linkChildren as $n) {
echo $n->nodeValue.'<br>';
}
}
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