Interpret the role of PHP DOMDocument in parsing XML files_PHP Tutorial

When using

Regarding the XML file used, take the XML in the article "A Brief Discussion on the Use of Simplexml for Php Xml Processing" as an example. The file name is: me.xml. The code is as follows:

PHP XML processing XML code

1. ?xml version="1.0" encoding="utf-8"?>
2. phplamp>
3. post>
4. title id=" 1">Introduction to PHP XML Processing 1 /title>
5. details>Details 1 /details>
6. /post >
7. post>
8. title id="2">PHP XML processing introduction 2 /title> ; 
9. details>Details 2 /details>
10. /post>
11. post > >=
12. "3">Introduction to PHP XML processing three /title> details> >Details 3
/details
13. > < ; /post>
/phplamp
14. > Then you need to use PHP DOMDocument to process this file and parse out any elements in the XML file. The code is as follows, with comments inside.
PHP DOMDocument parsing XML file code
15. This is just one method, PHP DOMDocument is quite powerful, and there are more parsing methods and strategies waiting for you to discover .
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<ol class="dp-xml">
<li class="alt"><span><span class="tag"><span> ?php   </span></span></span></li>
<li><span>// 首先要建一个DOMDocument对象   </span></li>
<li class="alt">
<span>$</span><span class="attribute">xml</span><span> = </span><span class="attribute-value">new</span><span> DOMDocument();   </span>
</li>
<li><span> </span></li>
<li class="alt"><span>// 加载Xml文件   </span></li>
<li>
<span>$xml-</span><span class="tag">></span><span>load("me.xml");   </span>
</li>
<li class="alt"><span> </span></li>
<li><span>// 获取所有的post标签   </span></li>
<li class="alt">
<span>$</span><span class="attribute">postDom</span><span> = $xml-</span><span class="tag">><br></span><span>getElementsByTagName("post");   </span>
</li>
<li><span> </span></li>
<li class="alt"><span>// 循环遍历post标签   </span></li>
<li><span>foreach($postDom as $post){   </span></li>
<li class="alt"><span>// 获取Title标签Node   </span></li>
<li>
<span>$</span><span class="attribute">title</span><span> = $post-</span><span class="tag">><br></span><span>getElementsByTagName("title");   </span>
</li>
<li class="alt"><span> </span></li>
<li><span>/**   </span></li>
<li class="alt"><span>* 要获取Title标签的Id属性要分两部走   </span></li>
<li>
<span>* 1. 获取title中所有属性的<br>列表也就是$title-</span><span class="tag">></span><span>item(0)-</span><span class="tag">></span><span>attributes   </span>
</li>
<li class="alt"><span>* 2. 获取title中id的属性，<br>因为其在第一位所以用item(0)   </span></li>
<li><span>*   </span></li>
<li class="alt"><span>* 小提示：   </span></li>
<li>
<span>* 若取属性的值可以用item(*)-</span><span class="tag">></span><span>nodeValue   </span>
</li>
<li class="alt">
<span>* 若取属性的标签可以用item(*)-</span><span class="tag">></span><span>nodeName   </span>
</li>
<li>
<span>* 若取属性的类型可以用item(*)-</span><span class="tag">></span><span>nodeType   </span>
</li>
<li class="alt"><span>*/   </span></li>
<li>
<span>echo "Id: " . $title-</span><span class="tag">></span><span>item(0)-</span><span class="tag">><br></span><span>attributes-</span><span class="tag">></span><span>item(0)-</span><span class="tag">></span><span>nodeValue . "</span><span class="tag"><span> </span><span class="tag-name">br</span><span> </span><span class="tag">/></span><span>";   </span></span>
</li>
<li class="alt">
<span>echo "Title: " . $title-</span><span class="tag">><br></span><span>item(0)-</span><span class="tag">></span><span>nodeValue . "</span><span class="tag"><span> </span><span class="tag-name">br</span><span> </span><span class="tag">/></span><span>";   </span></span>
</li>
<li>
<span>echo "Details: " . $post-</span><span class="tag">><br></span><span>getElementsByTagName("details")-</span><span class="tag">></span><span>i<br>tem(0)-</span><span class="tag">></span><span>nodeValue . "</span><span class="tag"><span> </span><span class="tag-name">br</span><span> </span><span class="tag">/></span><span class="tag"><span> </span><span class="tag-name">br</span><span> </span><span class="tag">/></span><span>";   </span></span></span>
</li>
<li class="alt"><span>}   </span></li>
<li>
<span class="tag">?></span><span>  </span>
</li>
</ol>

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In using the XML files used, we also use Php Xml to process the simplexml usage method. The XML in the article is as For example, the file name is: me.xml. The code is as follows: PHP XML processing XML code ?xml versi...