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php5新增了Simplexml extension,我们可以借助它来解析,修改XML。在IBM的知识库里找到一篇文章对此做了专门的介绍，而且比较详细，感兴趣的话可以看看最后的参考文档。 一个RSS Feed
下面是一个RSS的例子，我们准备用simplexml来解析它。
<?xml version="1.0" encoding="UTF-8"?>
<rss version="0.92">
<channel>
<title>Mokka mit Schlag</title>
<link>http://www.elharo.com/blog</link>
<language>en</language>
<item>
<title>Penn Station: Gone but not Forgotten</title>
<description>
The old Penn Station in New York was torn down before I was born.
Looking at these pictures, that feels like a mistake. The current site is
functional, but no more; really just some office towers and underground
corridors of no particular interest or beauty. The new Madison Square...
</description>
<link>http://www.elharo.com/blog/new-york/2006/07/31/penn-station</link>
</item>
<item>
<title>Personal for Elliotte Harold</title>
<description>Some people use very obnoxious spam filters that require you
to type some random string in your subject such as E37T to get through.
Needless to say neither I nor most other people bother to communicate with
these paranoids. They are grossly overreacting to the spam problem.
Personally I won’t ...</description>
<link>http://www.elharo.com/blog/tech/2006/07/28/personal-for-elliotte-harold/</link>
</item>
</channel>
</rss> |
解析XML
首先载入一个xml
| $rss = simplexml_load_file(’http://www.ooso.net/index.php/feed/’); |
这里使用的是simplexml_load_file函数，能够马上解析指定url的xml文件，因为是simplexml，所以simple。下面就可以象读取php数组一样来使用解析后xml的内容了，比如读取RSS的标题：
$title = $rss->channel->title;
<title><?php echo $title; ?></title> |
或者是循环显示rss的各个ITEM节点
| $rss->channel->item //这个是item |
foreach ($rss->channel->item as $item) {
echo "<h2>" . $item->title . "</h2>";
echo "<p>" . $item->description . "</p>";
} |
一个简单但完整的RSS Reader
把上面的代码整合在一起，就是一个五脏俱全的麻雀牌RSS Reader了
<?php
// 载入并解析XML
$rss = simplexml_load_file(’http://partners.userland.com/nytRss/nytHomepage.xml’);
$title = $rss->channel->title;
?>
<html xml:lang="en" lang="en">
<head>
<title><?php echo $title; ?></title>
</head>
<body>
<h1><?php echo $title; ?></h1>
<?php
// 循环输出ITEM节点的说明
foreach ($rss->channel->item as $item) {
echo "<h2><a href=’" . $item->link . "’>" . $item->title . "</a></h2>";
echo "<p>" . $item->description . "</p>";
}
?>
</body>
</html> |
Simplexml,真的很simple,不信可以拿去和php的DOM function做下比较:)
参考
http://www-128.ibm.com/developerworks/xml/library/x-simplexml.html | 
