使用DOMDocument生成的XML文件未显示编码

Question

$doc = new DOMDocument('1.0', 'UTF-8');
$doc->xmlStandalone = true;
$doc->loadXML($error);
echo $doc->saveXML();

输出

<?xml version="1.0"?>
<error status="fatal" httpResponseCode="500" httpResponseMessage="Internal Server Error">
        <errorType>InternalServerError</errorType>
        <errorServer>FeedServer</errorServer>
        <errorMessage>Failed to process GetFeed request</errorMessage>
        <friendlyMessage/>
        <innerMessage>No permitted outlet found</innerMessage>
</error>

$doc    = new DOMDocument('1.0', 'UTF-8');
$doc->loadXML($error);
$doc->xmlStandalone = true;
$doc->encoding = 'UTF-8';
echo $doc->saveXML(); 

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<error status="fatal" httpResponseCode="500" httpResponseMessage="Internal Server Error">
        <errorType>InternalServerError</errorType>
        <errorServer>FeedServer</errorServer>
        <errorMessage>Failed to process GetFeed request</errorMessage>
        <friendlyMessage/>
        <innerMessage>No permitted outlet found</innerMessage>
</error>

Answer 1

当调用loadXML时，New DOMDocument构造函数中的参数将被加载的XML文档中的值覆盖。

如果在调用savexml之前设置了输出文档的编码（例如$doc->encoding='utf-8')，则应该将其添加到XML声明中。