无法在 PHP 中遍历 XML 节点 [英] Cannot loop through XML nodes in PHP

问题描述

我有一个用于存储评论的文件.文件名为 comments.xml:

I have a file where I store comments. The file name is comments.xml:

<?xml version="1.0" encoding="utf-8"?>
<comment>
  <user>User4251</user>
  <date>02.10.2018</date>
  <text>Comment body goes here</text>
</comment>
<comment>
  <user>User8650</user>
  <date>01.10.2018</date>
  <text>Comment body goes here</text>
</comment>

为了遍历 XML 树，我使用了 W3Schools 中给出的示例(对参数进行了一些修改).代码包含在 index.php 中:

To loop through the XML tree, I am using the example given at W3Schools (with some modifications to the parameters). The code is contained in index.php:

<?php
  $xml = simplexml_load_file("comments.xml") or die("Error: Cannot create object");
  foreach($xml -> children() as $comments) { 
    echo $comments -> user . ", "; 
    echo $comments -> date . ", "; 
    echo $comments -> text . "<br>";
  }
?>

根据示例，我期待:

User4251, 02.10.2018, Comment body goes here
User8650, 02.10.2018, Comment body goes here

但是，我收到三个错误:

However, I am getting three errors:

警告: simplexml_load_file():comments.xml:7:解析器错误:192.168.0.1/users/User8650/index.php中文档末尾的额外内容强>在线2

Warning: simplexml_load_file(): comments.xml:7: parser error : Extra content at the end of the document in 192.168.0.1/users/User8650/index.php on line 2

警告: simplexml_load_file():在 192.168.0.1/users/User8650/index.php 中 2

Warning: simplexml_load_file(): in 192.168.0.1/users/User8650/index.php on line 2

警告: simplexml_load_file(): ^ in 192.168.0.1/users/User8650/index.php 2

Warning: simplexml_load_file(): ^ in 192.168.0.1/users/User8650/index.php on line 2

错误:无法创建对象

第四个是由于 die() 语句.

The fourth one is due to the die() statement.

这个例子是错误的还是我哪里出错了?

Is the example erroneous or am I going wrong somewhere?

推荐答案

您没有有效的 XML 文档中的根元素.这将起作用:

You don't have a valid root element in your XML document. This will work:

<root_example>
 <comment>
   <user>User4251</user>
   <date>02.10.2018</date>
   <text>Comment body goes here</text>
  </comment>
  <comment>
   <user>User8650</user>
   <date>01.10.2018</date>
   <text>Comment body goes here</text>
 </comment>
</root_example>

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