PHP XML Parser

使用了Document Object Model (DOM) extension。

XML范例文件：test.xml

<?xml version="1.0" encoding="ISO-8859-1"?>
<mynotes>
<note>
<tasks>Validate data</tasks>
<details>Validate data in SQL2005 Database with SQL manager</details>
</note>
<note>
<tasks>Download Music</tasks>
<details>Download latest music from site abc</details>
</note>
</mynotes>

PHP代码：

<?
  // DOMElement->getElementsByTagName() -- Gets elements by tagname
  // nodeValue : The value of this node, depending on its type.
  // Load XML File. You can use loadXML if you wish to load XML data from a string
  $objDOM = new DOMDocument();
  $objDOM->load("test.xml"); //make sure path is correct
  $note = $objDOM->getElementsByTagName("note");
  // for each note tag, parse the document and get values for
  // tasks and details tag.
  foreach( $note as $value )
  {
    $tasks = $value->getElementsByTagName("tasks");
    $task  = $tasks->item(0)->nodeValue;
    $details = $value->getElementsByTagName("details");
    $detail  = $details->item(0)->nodeValue;
    echo "$task :: $detail <br>";
  }
?> 

处理过程中碰到一个错误：“DOMDocument::LoadXML Extra content at the end of the document in Entity...”

原因是源文件不是标准的XML，没有root element，导致无法生成DOM tree。自己手动加上了一对tag，名字无所谓，因为没有严格的schema校验。

官方参考：http://us3.php.net/manual/en/refs.xml.php

参考：http://www.geekpedia.com/tutorial156_How-to-read-XML-using-PHP-DOM.html

http://www.dave78.com/2008/02/19/domdocumentloadxml-extra-content-at-the-end-of-the-document-in-entity/