交替出现错误(文档末尾的额外内容) [英] Alternately getting the error (Extra content at the end of the document )

问题描述

我在加载 xml 文件时出错.我得到了许多与该主题相关的答案，但我真的找不到为什么我的文件中可能会出现此错误.

I am getting error while loading the xml file. I got many answers related to the topic but I really could not find why this error maybe coming in my file.

Warning: DOMDocument::load() [<a href='domdocument.load'>domdocument.load</a>]: Extra content at the end of the document 

当我运行文件时，它运行成功，但是当我重新加载它时，它给出了上述错误而不是添加另一个节点.但是，下次当我重新加载它时，它会再次成功运行.这是交替发生的.请有人告诉我为什么会发生这种情况以及如何解决问题.

When I am running the file, it runs successfully, but when I reload it, it gives the above error instead of adding another node. But, next time when I reload it runs successfully again. This is happening alternatively. Please someone tell me why is this happening and how to solve the problem.

我正在使用这个 php 代码来编辑 xml 文件:

I am using this php code to edit the xml file:

<?php
$dom = new DomDocument("1.0", "UTF-8");
$dom->load('filename.xml');

$noteElem = $dom->createElement('note');
$toElem = $dom->createElement('to', 'Chikck');
$fromElem = $dom->createElement('from', 'ewrw');

$noteElem->appendChild($toElem);
$noteElem->appendChild($fromElem);

$dom->appendChild($noteElem);
$dom->formatOutput = TRUE;
//$xmlString = $dom->saveXML();
//echo $xmlString;
$dom->save('filename.xml');
?>

这是我正在编辑的 xml 文件:

This is the xml file I am editing:

<?xml version="1.0" encoding="UTF-8"?>
<note>
  <to>Chikck</to>
  <from>ewrw</from>
</note>

推荐答案

额外的内容错误是由于将两个相同的节点(在本例中为 note 节点)作为根元素引起的.

The extra content error is caused by having two of the same node, in this case the note node, as a root element.

例如，您可以添加一个新的根元素 notes，然后在其中添加更多 note 元素.

You could add a new root element notes for example, and then add more note elements within that.

这里有一个使用 simplexml 库的例子(只是因为我使用了这个并且我很熟悉它)

Here's an example using the simplexml library (just because I use this one and I'm familiar with it)

新的 filename2.xml:(添加了 notes 元素作为根)

New filename2.xml: (with added notes element as root)

<?xml version="1.0" encoding="UTF-8"?>
<notes>
    <note>
        <to>Chikck</to>
        <from>ewrw</from>
    </note>
</notes>

PHP 脚本:

<?php
    $xml = simplexml_load_file('filename2.xml');
    $note = $xml->addChild('note');
    $to = $note->addchild('to', 'Chikck');
    $from = $note->addChild('from', 'ewrw');
    $xml->asXML('filename2.xml');
?>

运行脚本后的filename2.xml:

filename2.xml after running script:

<?xml version="1.0" encoding="UTF-8"?>
<notes>
    <note>
        <to>Chikck</to>
        <from>ewrw</from>
    </note>
    <note>
        <to>Chikck</to>
        <from>ewrw</from>
    </note>
</notes>

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