php 如何使用 DOMDocument 替换节点的文本
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How to replace the text of a node using DOMDocument
提问by Salman A
This is my code that loads an existing XML file or string into a DOMDocument object:
这是我将现有 XML 文件或字符串加载到 DOMDocument 对象中的代码：
$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($linkText));
I need to overwrite the value inside the title, description and link tags. The Last three lines in the above code are my attempt at doing so; but seems like if the nodes are not empty then the text will be "appended" to existing content. How can I empty the text content of a node and append new text in one line.
我需要覆盖标题、描述和链接标签内的值。上面代码中的最后三行是我尝试这样做的；但似乎如果节点不为空，则文本将“附加”到现有内容中。如何清空节点的文本内容并在一行中附加新文本。
回答by lonesomeday
Set DOMNode::$nodeValueinstead:
DOMNode::$nodeValue改为设置：
$doc->getElementsByTagName("title")->item(0)->nodeValue = $titleText;
$doc->getElementsByTagName("description")->item(0)->nodeValue = $descriptionText;
$doc->getElementsByTagName("link")->item(0)->nodeValue = $linkText;
This overwrites the existing content with the new value.
这将使用新值覆盖现有内容。
回答by Raaghu
as doub1eHyman mentioned
正如 doub1eHyman 提到的
$doc->getElementsByTagName("title")->item(0)->nodeValue = $titleText;
will give error if $titleText = "& is not allowed in Node::nodeValue";
会报错，如果 $titleText = "& is not allowed in Node::nodeValue";
So the better solution would be
所以更好的解决方案是
// clear the existing text content
$doc->getElementsByTagName("title")->item(0)->nodeValue = "";
// then create new TextNode
$doc->getElementsByTagName("title")->item(0)->appendChild($doc->createTextNode($titleText));
