PHP如何使用具有DOMdocument的XML中的实体 [英] PHP How to use quot; entities in XML with DOMdocument

问题描述

我正在修改其他库生成的XML文件的内容。我正在使用PHP（5.3.10）进行一些DOM修改，然后重新插入替换节点。

I am working on modifying the contents of an XML file generated by some other library. I'm making some DOM modifications with PHP (5.3.10) and reinserting a replacement node.

我正在使用的XML数据具有 & quot ;元素，然后再进行操作，我希望按照 http：// www保留这些元素。 w3.org/TR/REC-xml/ 完成修改后。

The XML data I'm working with has &quot; elements before I do the manipulation and I want to keep those elements as per http://www.w3.org/TR/REC-xml/ when I'm done with the modifications.

但是我在更改<$时遇到了PHP问题c $ c>& 元素。参见我的示例。

However I'm having problems with PHP changing the " elements. See my example.

$temp = 'Hello "XML".';
$doc = new DOMDocument('1.0', 'utf-8');
$newelement = $doc->createElement('description', $temp);
$doc->appendChild($newelement);
echo $doc->saveXML() . PHP_EOL; // shows " instead of element
$node = $doc->getElementsByTagName('description')->item(0);
echo $node->nodeValue . PHP_EOL; // also shows "

输出

<?xml version="1.0" encoding="utf-8"?> 
<description>Hello "XML".</description>

Hello "XML".

这是PHP错误还是做错了？我希望不必在每个字符位置都使用createEntityReference。

Is this a PHP error or am I doing something wrong? I hope it isn't necessary to use createEntityReference in every char location.

类似的问题：
PHP XML实体编码问题

编辑：作为示例，显示saveXML不应像& & 实体>行为正常。这个$ temp字符串应该真正输出，因为它是在saveXML（）期间最初与实体​​一起输入的。

As an example to show saveXML should not be converting the " entities just like the & which behaves properly. This $temp string should really be output as it is initially entered with the entities during saveXML().

$temp = 'Hello "XML" &.';
$doc = new DOMDocument('1.0', 'utf-8');
$newelement = $doc->createElement('description', $temp);
$doc->appendChild($newelement);
echo $doc->saveXML() . PHP_EOL; // shows " instead of element like &
$node = $doc->getElementsByTagName('description')->item(0);
echo $node->nodeValue . PHP_EOL; // also shows " &

输出

<?xml version="1.0" encoding="utf-8"?>
<description>Hello "XML" &amp;.</description>

Hello "XML" &.

推荐答案

答案是，它实际上并不需要根据规范进行转义（跳过对CDATA的提及）：

The answer is that it doesn't actually need any escaping according to the spec (skipping the mentions of CDATA):

&字符（&）和左尖括号（<）不得以其原义形式出现（... ）如果在其他地方需要使用它们，则必须必须使用数字字符引用或字符串进行转义。 & amp; 和 & lt; " 。右尖括号（>） 可以用字符串表示。 & gt; " （...）

The ampersand character (&) and the left angle bracket (<) must not appear in their literal form (...) If they are needed elsewhere, they must be escaped using either numeric character references or the strings " & " and " < " respectively. The right angle bracket (>) may be represented using the string " > " (...)

要允许属性值同时包含单引号和双引号，可以表示单引号或单引号字符（'）为 &’ " ，并且双引号字符（）为" & quot; 。

To allow attribute values to contain both single and double quotes, the apostrophe or single-quote character (') may be represented as " ' ", and the double-quote character (") as " " ".

您可以使用 createTextNode（）执行正确的转义：

You can verify this easily by using createTextNode() to perform the correct escaping:

$dom = new DOMDocument;
$e = $dom->createElement('description');
$content = 'single quote: \', double quote: ", opening tag: <, ampersand: &, closing tag: >';
$t = $dom->createTextNode($content);
$e->appendChild($t);
$dom->appendChild($e);

echo $dom->saveXML();

输出：

<?xml version="1.0"?>
<description>single quote: ', double quote: ", opening tag: &lt;, ampersand: &amp;, closing tag: &gt;</description>

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