如何处理 PHP DOMXPath 中的多个子元素？
[英]How to handle multiple sub-elements in PHP DOMXPath?
问题描述
I'd like to import an HTML document onto a MySQL database using PHP.
我想使用 PHP 将 HTML 文档导入 MySQL 数据库。
The structure of the document looks like this:文档的结构如下所示：
<p class="word">
<span class="word-text">word1</span>
<span class="grammatical-type">noun</span>
</p>
...
<p class="word">
<span class="word-text">word128</span>
<span class="grammatical-type">adjective</span>
</p>
For each word , I only have one word-text and one grammatical-type .对于每个单词，我只有一个word-text和一个grammatical-type 。
I'm able to find each word node, but for each of its children word-text and grammatical-type I'd like to perform a MySQL query:我能够找到每个单词节点，但是对于它的每个子单词文本和语法类型，我想执行 MySQL 查询：
$dom = new DOMDocument();
$dom->loadHTMLFile($location);
$xpath = new DomXPath($dom);
$res = $xpath->query("//p[@class='word']");
foreach ($res as $textNode) {
//do something here for each *word-text*->nodeValue
//do something here for each *grammatical-type*->nodeValue
}
}
I tried in the foreach loop to pass $textNode , which is a DOMNode , as a $contextNode as follows:我尝试在foreach循环中将$textNode （一个DOMNode ）作为$contextNode ，如下所示：
$wordText = $xpath->query("span[@class='word-text']", $textNode);
$myWord = $wordText->nodeValue;
But in $wordText I only have a DOMNodeList with a NULL nodeValue .但是在 $wordText 我只有一个带有NULL nodeValue的 DOMNodeList 。
How can I, starting from the word node, manage the children nodes?如何从单词节点开始管理子节点？
Thanks谢谢
2 个解决方案
解决方案1
0 2022-01-24 07:36:09
Solved.解决了。
You just need to, as you know that the node only contains a single element, select this single element using item(0) :你只需要，因为你知道node只包含一个元素， select 这个单个元素使用item(0) ：
$dom = new DOMDocument();
$dom->loadHTMLFile($location);
$xpath = new DomXPath($dom);
$res = $xpath->query("//p[@class='word']");
foreach ($res as $textNode) {
$wordTextNode = $xpath->query("span[@class='word-text']", $textNode);
$word = $wordTextNode->item(0)->nodeValue;
//do same thing here for each *grammatical-type*
}
}
解决方案2
0 2022-01-24 07:38:13
You can provide different node as context in your $xpath->query calls:您可以在$xpath->query调用中提供不同的节点作为上下文：
<?php
$location = 'so-dom.html';
$dom = new DOMDocument();
$dom->loadHTMLFile($location);
$xpath = new DomXPath($dom);
$res = $xpath->query("//p[@class='word']");
foreach ($res as $textNode) {
echo $xpath->query('./a/text()', $textNode)[0]->nodeValue;
//^^^^^^^^^
};
?>
Where doc is文档在哪里
<head></head>
<body>
<p class="word"><a>one</a></p>
<p class="word"><a>two</a></p>
</body>
will print "onetwo"将打印“onetwo”
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