在XML中创建子元素 [英] Creating sub element in XML

问题描述

我正在尝试完成以下任务:

I am trying to accomplish the following:

<?xml version="1.0"?>
<books>
<book>
<name>Harry potter</name>
<category>Adventure | Family | Fantasy</category>
<pages>850</pages>
<author>
<author_name>Jhon Doe</author_name>
<author_wiki>http://wikipedia....</author_wiki>
</author>
<description>lorem ipsum blabla</description>
</book>
</books>

我无法工作的部分是介于两者之间的作者元素. 但是我不能再这样下去了，香港专业教育学院尝试了很多事情，但似乎只给了我空白页面. 我现在所拥有的:

The part i cant get to work is de author element in between. But i cant go futher then is, ive tried a lot of things but it seems to only give me blanco pages. What i have now:

<?xml version="1.0"?>
<books>
<book>
<name>Harry potter</name>
<category>Adventure | Family | Fantasy</category>
<pages>850</pages>
<description>lorem ipsum blabla</description>
</book>
</books>

<?php header('Content-Type: text/xml;'); 
// Start XML file, create parent node
$doc = new DOMDocument('1.0');
$root = $doc->createElement('books');
$root = $doc->appendChild($root);
// we want a nice output
$doc->formatOutput = true;
$user = $doc->createElement('book');
$user = $doc->appendChild($user);
$title = $doc->createElement('name');
$title = $user->appendChild($title);
$text = $doc->createTextNode('Harry potter');
$text = $title->appendChild($text);
$title = $doc->createElement('category');
$title = $user->appendChild($title);
$text = $doc->createTextNode('Adventure | Family | Fantasy');
$text = $title->appendChild($text);
$title = $doc->createElement('pages');
$title = $user->appendChild($title);
$text = $doc->createTextNode('850');
$text = $title->appendChild($text);
$title = $doc->createElement('description');
$title = $user->appendChild($title);
$text = $doc->createTextNode('lorem ipsum blabla');
$text = $title->appendChild($text);
$user = $root->appendChild($user);
echo $doc->saveXML();
?>

推荐答案

向DOM添加节点需要3个步骤

Addding nodes to the DOM requires 3 Steps

1. 使用诸如createElement()或createTextNode()
之类的Document方法创建节点
2. 配置节点并追加子节点
3. 将节点附加到其父节点

1. Create the node using Document methods like createElement() or createTextNode()
2. Configure the node and append child nodes
3. Append the node to its parent node

第2步和第3步是可交换的.您可以在附加节点之后或之前配置节点. appendChild()返回附加节点.

Step 2 and 3 are exchangeable. You can configure a node after you appended it or before. appendChild() returns the append node.

我根据结果xml中的级别缩进了调用:

I indented the calls depending on the level in the result xml:

$doc = new DOMDocument('1.0');
$doc->formatOutput = true;

$books = $doc->appendChild($doc->createElement('books'));
  $book = $books->appendChild($doc->createElement('book'));
    $name = $book->appendChild($doc->createElement('name'));
      $name->appendChild($doc->createTextNode('Harry potter'));
    $category = $book->appendChild($doc->createElement('category'));
      $category->appendChild($doc->createTextNode('Adventure | Family | Fantasy'));
    $pages = $book->appendChild($doc->createElement('pages'));
      $pages->appendChild($doc->createTextNode('850'));

    $author = $book->appendChild($doc->createElement('author'));
      $authorName = $author->appendChild($doc->createElement('author_name'));
        $authorName->appendChild($doc->createTextNode('John Doe'));
      $authorWiki = $author->appendChild($doc->createElement('author_wiki'));
        $authorWiki->appendChild($doc->createTextNode('http://wikipedia....'));

    $description = $book->appendChild($doc->createElement('description'));
      $description->appendChild($doc->createTextNode('lorem ipsum blabla'));

echo $doc->saveXML();

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