PHP如何使用“;(PHP How to use quot; entities in XML with DOMdocument)

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。

我正在使用的XML数据有&quot 在我进行操作之前的元素，并且当我完成修改时，我想按照http://www.w3.org/TR/REC-xml/保留这些元素。

但是我遇到了PHP改变"问题" 元素。看看我的例子。

$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 "

产量

<?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？我希望没有必要在每个char位置使用createEntityReference。

类似问题： PHP XML实体编码问题

编辑：作为一个示例，显示saveXML不应该转换为" 实体就像& 行为正常。这个$ temp字符串应该输出，因为它最初是在saveXML（）期间与实体一起输入的。

$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 " &

产量

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

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.

The XML data I'm working with has " 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.

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 "

Output

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

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

Similar Question: PHP XML Entity Encoding issue

EDIT: 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 " &

Output

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

最满意答案

答案是根据规范它实际上并不需要任何转义（跳过CDATA的提及）：

＆符号（＆）和左尖括号（<）不得以其字面形式出现（...）如果在别处需要它们，则必须使用数字字符引用或字符串" & "和" < "转义" < " 。右尖括号（>）可以使用字符串" > " （...）

为了允许属性值包含单引号和双引号，撇号或单引号字符（'）可以表示为" ' " ，而双引号字符（“）表示为" " " " " " 。

您可以使用createTextNode()轻松验证这一点，以执行正确的转义：

$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: <, ampersand: &, closing tag: ></description>

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

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 " " ".

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();

Output:

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

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