PHP 如何使用quot; XML 中包含 DOMdocument 的实体

Question

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

我正在处理的 XML 数据有 &quot；在我进行操作之前添加元素，我想在完成修改后按照 http://www.w3.org/TR/REC-xml/ 保留这些元素。

但是我在 PHP 更改 " 元素时遇到问题。看我的例子。

$temp = 'Hello &quot;XML&quot;.';
$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 错误还是我做错了什么？我希望不必在每个字符位置都使用 createEntityReference。

类似问题： PHP XML Entity Encoding issue

编辑：作为一个例子来展示保存XML不应该像&那样转换"实体，它的行为是正确的。这个 $temp 字符串实际上应该被输出，因为它最初是在 saveXML().

期间与实体一起输入的

$temp = 'Hello &quot;XML&quot; &amp;.';
$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 &amp;
$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" &.

Answer 1

答案是根据 spec（跳过 CDATA 的提及），它实际上不需要任何转义：

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 " > " (...)

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 " " ".

您可以通过使用 createTextNode() 执行正确的转义来轻松验证这一点：

$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>

PHP 如何使用quot; XML 中包含 DOMdocument 的实体

PHP How to use quot; entities in XML with DOMdocument

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