[英]php DOMXpath query on DOMElement not working correctly
我正在尝试运行xpath查询以返回设置了key_id属性的<div class =“ classB”>内的所有元素。
<?php
$dom = new DOMDocument;
$dom->loadHTML('
<html>
<head></head>
<body>
<div class="classA">
<div key_id="a:1234"></div>
<div key_id="a:2345"></div>
<div key_id="a:3456"></div>
<div class="sub"></div>
<div class="sub"></div>
</div>
<div class="classB">
<div key_id="b:1234"></div>
<div key_id="b:2345"></div>
<div key_id="b:3456"></div>
<div class="sub"></div>
<div class="sub"></div>
</div>
</body>
</html>
');
$xpath = new DOMXpath ($dom);
$classB = $xpath->query("//*[contains(concat(' ', @class, ' '), ' classB ')]")->item(0);
$subNodes = $xpath->query("//*[@key_id]", $classB);
foreach($subNodes as $elem) {
var_dump($elem->getAttribute('key_id'));
}
?>
输出以下内容:
string(6) "a:1234"
string(6) "a:2345"
string(6) "a:3456"
string(6) "b:1234"
string(6) "b:2345"
string(6) "b:3456"
但我试图得到这个:
string(6) "b:1234"
string(6) "b:2345"
string(6) "b:3456"
如您所见,我将“ classB” div作为相对查询传递:
$subNodes = $xpath->query("//*[@key_id]", $classB);
我的理解是查询采用DOMNode类型的可选domContext,而$ classB是扩展DOMNode的DOMElement。
我究竟做错了什么?
尝试
$xpath = new DOMXpath ($dom);
$subNodes = $xpath->query("*/div[@class='classB']/div[@key_id]");
foreach($subNodes as $elem) {
echo $elem->getAttribute('key_id');
}
在此处查看演示
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