如何使用DOMDocument替换节点的文本 [英] How to replace the text of a node using DOMDocument

问题描述

这是我的代码，用于将现有XML文件或字符串加载到DOMDocument对象中:

This is my code that loads an existing XML file or string into a DOMDocument object:

$doc = new DOMDocument();
$doc->formatOutput = true;

// the content actually comes from an external file
$doc->loadXML('<rss version="2.0">
<channel>
    <title></title>
    <description></description>
    <link></link>
</channel>
</rss>');

$doc->getElementsByTagName("title")->item(0)->appendChild($doc->createTextNode($titleText));
$doc->getElementsByTagName("description")->item(0)->appendChild($doc->createTextNode($descriptionText));
$doc->getElementsByTagName("link")->item(0)->appendChild($doc->createTextNode($linkText));

我需要覆盖标题，描述和链接标记内的值.上面代码中的最后三行是我这样做的尝试；但似乎如果节点不为空，则文本将附加"到现有内容.如何清空节点的文本内容并在一行中添加新文本.

I need to overwrite the value inside the title, description and link tags. The Last three lines in the above code are my attempt at doing so; but seems like if the nodes are not empty then the text will be "appended" to existing content. How can I empty the text content of a node and append new text in one line.

推荐答案

设置 DOMNode::$nodeValue 代替:

$doc->getElementsByTagName("title")->item(0)->nodeValue = $titleText;
$doc->getElementsByTagName("description")->item(0)->nodeValue = $descriptionText;
$doc->getElementsByTagName("link")->item(0)->nodeValue = $linkText;

这会用新值覆盖现有内容.

This overwrites the existing content with the new value.

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