XMLWriter(PHP)的编码问题 [英] Encoding issues with XMLWriter (PHP)

问题描述

使用以下简单的PHP代码:

Take this simple PHP code:

$xmlWriter = new XMLWriter();
$xmlWriter->openURI('php://output');
$xmlWriter->startDocument('1.0', 'utf-8');

$xmlWriter->writeElement('test', $data);

$xmlWriter->endDocument();
$xmlWriter->flush();

XMLWriter类具有一个不错的功能:它将把您提供给它的所有数据转换为输出编码.例如，在这里它将把$data转换为UTF-8，因为我在startDocument函数中传递了'utf-8'.

The XMLWriter class has a nice feature: it will convert any data you give to it to the output encoding. For example here it will convert $data to UTF-8 because I passed 'utf-8' in the startDocument function.

问题在于，在我的情况下，$data的内容来自其输出格式为UTF-8的数据库，因此已经为UTF-8 了. XMLWriter 可能认为数据在ISO-8859-1中，然后再次将其转换为UTF-8，我得到了奇怪的符号，应该重音.

The problem is that in my case the content of $data comes from a database whose output format is UTF-8 and is therefore already in UTF-8. The XMLWriter probably thinks the data is in ISO-8859-1 and converts it again to UTF-8, and I get weird symbols where I should get accents.

目前，我正在对来自数据库的每个字符串使用utf8_decode，这意味着我正在从UTF-8转换为ISO-8859-1，然后XMLWriter将其转换回UTF-8.

Currently I'm using utf8_decode around each string coming from the database, which means I'm converting from UTF-8 to ISO-8859-1, and then XMLWriter turns it back into UTF-8.

这有效，但不干净:

$xmlWriter->writeElement('test', utf8_decode($data));

有更清洁的解决方案吗?

Is there a cleaner solution ?

编辑:显示完整示例

$xmlWriter = new XMLWriter();
$xmlWriter->openURI('php://output');
$xmlWriter->startDocument('1.0', 'utf-8');
$xmlWriter->startElement('usersList');

$database = new PDO('mysql:host=localhost;dbname=xxxxx', 'xxxxx', 'xxxxx');
$database->exec('SET CHARACTER SET UTF8');
$database->exec('SET NAMES UTF8');
foreach ($database->query('SELECT name FROM usersList') as $user)
   $xmlWriter->writeElement('user', $user[0]);   // if the user's name is 'hervé' in the database, it will print 'hervé' instead

$xmlWriter->endElement();
$xmlWriter->endDocument();
$xmlWriter->flush();

推荐答案

我不确定您从何处想到XMLWriter会转换编码.没有.您必须为其提供utf-8.它可以输出不同的编码，但是输入字符串必须为utf-8.

I'm not sure where you got the idea that XMLWriter converts encodings. It doesn't. You must supply it with utf-8. It can output different encodings, but input strings must be utf-8.

这里可能发生以下两种情况之一:

One of two things may be going on here:

1. 无论您使用什么视图，输出文档都将字符串解释为win-1252.如果在浏览器中查看输出，则可能需要设置content-type标头，如下所示:header('Content-Type: application/xml; charset=UTF-8');
2. 您将数据错误地存储在数据库中，并且您的é"实际上是两个Unicode字符é".解决这个问题很困难.

1. Whatever you are using to view your output document is interpreting the string as win-1252. If you are viewing your output in a browser, you may need to set the content-type header like so: header('Content-Type: application/xml; charset=UTF-8');
2. You stored your data in your database incorrectly, and your "é" is actually two unicode characters "é". Fixing this is difficult.

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