在用simplexml_load_string时调用asXML会改变原有xml文本格式

[DreamlingBig]

Description

<?php

$xml = '<?xml version="1.0" encoding="UTF-8"?><root><teenMode>0</teenMode><M-Value>V/WvP1WCRxH9uDe6ZW6VrA==
</M-Value><uid>5470686000</uid><qq>861683052</qq>
<item cmd="1" optime="1714311948" QQ="861683052"/></root>';
$post_body = simplexml_load_string($xml);
$post_body->item['QQ'] = 99408162;
$post_body = $post_body->asXML();//Return a well-formed XML string based on SimpleXML element
print_r($post_body);

上面返回的结果（第一行后面应该是没有换行的，调用asXML后会改变了原有的格式）

<?xml version="1.0" encoding="UTF-8"?>
<root><teenMode>0</teenMode><M-Value>V/WvP1WCRxH9uDe6ZW6VrA==
</M-Value><uid>5470686000</uid><qq>861683052</qq>
<item cmd="1" optime="1714311948" QQ="99408162"/></root>

应该返回的结果

<?xml version="1.0" encoding="UTF-8"?><root><teenMode>0</teenMode><M-Value>V/WvP1WCRxH9uDe6ZW6VrA==
</M-Value><uid>5470686000</uid><qq>99408162</qq>
<item cmd="1" optime="1714311948" QQ="861683052"/></root>

[nielsdos]

There are two differences in what you expect vs what you got:

• The <?xml version="1.0" encoding="UTF-8"?> is on a new line because whitespace after the xml delaration is not significant to an XML parser, and so they are not stored. That means that SimpleXML cannot know whether there was any whitespace, and it chooses to emit a newline for clarity. This has no impact on any parser and should thus not be a concern.
• There's a newline after V/WvP1WCRxH9uDe6ZW6VrA== because in your original XML code you also have a newline after this string. Newlines inside elements are significant and thus are preserved.

So there is not a bug here. The first one doesn't matter and the second one can be fixed by removing the newline.

[github-actions]

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