PHP利用RSS订阅别处文章
这篇文章是接上篇利用PHP操作XML文件的。RSS是基于XML的一种形式，它的具体规范如下（我们以截取的新浪RSS订阅频道的格式来看）：
输入：http://rss.sina.com.cn/news/world/focus15.xml 查看页面源码就可以看到RSS的结构：
<?xml version="1.0" encoding="utf-8"?> <?xml-stylesheet type="text/xsl" title="XSL Formatting" href="/show_new_final.xsl" media="all"?> <rss version="2.0"> <channel> <title> <![CDATA[国际要闻-新浪新闻]]> </title> <image> <title> <![CDATA[新闻中心-国际新闻]]> </title> <link>http://news.sina.com.cn/world</link> <url>http://www.sinaimg.cn/home/deco/2009/0330/logo_home_news.gif</url> </image> <description> <![CDATA[国际新闻-焦点新闻]]> </description> <link>http://news.sina.com.cn/491/2008/0827/1.html</link> <language>zh-cn</language> <generator>WWW.SINA.COM.CN</generator> <ttl>5</ttl> <copyright> <![CDATA[Copyright 1996 - 2012 SINA Inc. All Rights Reserved]]> </copyright> <pubDate>Sat, 22 Dec 2012 05:32:05 GMT</pubDate> <category> <![CDATA[]]> </category> <item> <title> <![CDATA[111个国家支持暂缓使用死刑 中美朝等41国反对]]> </title> <link>http://go.rss.sina.com.cn/redirect.php?url=http://news.sina.com.cn/w/2012-12-22/120825871683.shtml</link> <author>WWW.SINA.COM.CN</author> <guid>http://go.rss.sina.com.cn/redirect.php?url=http://news.sina.com.cn/w/2012-12-22/120825871683.shtml</guid> <category> <![CDATA[国际新闻-焦点新闻]]> </category> <pubDate>Sat, 22 Dec 2012 04:08:09 GMT</pubDate> <comments></comments> <description> <![CDATA[ 【法新社联合国12月20日电】周四，在联大讨论人权问题的主旨会议上，有创纪录的111个国家投票支持暂缓使用死刑。 虽然这次投票在法律上不具备约束力，但是人权活动分子说，每两年举行一次的表决，是向那些依然保留死刑的国家发出的强烈信号，这些数量在逐步减少的国家....]]> </description> </item> </channel> </rss>
具体规范信息是代表什么意思，根据标签的内容我们就可以很容易的知道，下面我们写一个rss.php来读取这个xml，从而获取这上面的文章：
<?php header("Content-Type:text/html;charset=utf-8"); ?>
<html>
<head>
<title>XML</title>
</head>
<body>
<?php
$dom = simplexml_load_file("http://rss.sina.com.cn/news/world/focus15.xml");
//var_dump($dom);
?>
<h2 id="The-example-of-RSS">The example of RSS</h2>
<ul>
<?php
foreach($dom->channel->item as $item)
{
print("<li>");
print("<a href='$item->link'>");
print($item->title);
print("</a>");
print("</li>");
}
?>
</ul>
</body>
</html>
注意这个函数：simplexml_load_file() ; 它既可以读本地的xml文件，也可以读网络上的xml。
运行结果：
Ok， That's all .... 天道酬勤！！
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