如何使用DOMDocument替换节点的文本

Question

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

$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.如何清空节点的文本内容并在一行中添加新文本.

Answer 1

设置DOMNode::$nodeValue改为:

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

这会使用新值覆盖现有内容.

Answer 2

正如doub1ejack所提到的

$doc->getElementsByTagName("title")->item(0)->nodeValue = $titleText;

如果出现错误 $titleText = "& is not allowed in Node::nodeValue";

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));