假设需要一个 PHP 页面将 RSS 提要(feed)转化成 HTML。RSS 是一种简单的 XML 格式用于发布连锁内容。文档的根元素是 rss，它包括一个 channel 元素。channel 元素包含关于提要的元数据，如标题、语言和 URL。它还包含各种封装在 item 元素中的报道。每个 item 都有一个 link 元素，包括一个 URL，还有 title 或 description(通常两者都有)，包含普通文本。不使用名称空间。RSS 的内容当然不止这些，不过对本文来说知道这些就足够了。清单 1 显示了一个典型的例子，它包含两个新闻项。
清单 1. RSS 提要
<?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
