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实例讲解PHP原生代码生成RSS文档，代码如下：
<?php
header("Content-Type:text/xml; charset=gb2312");
echo "<?xml version=\"1.0\" encoding=\"gb2312\"?>\n";
echo "<rss version=\"2.0\">\n";
echo "<channel>\n";
echo "<title><![CDATA[“十万个为什么”电脑学习网-办公自动化频道]]></title>\n";
echo "<description><![CDATA[http://why100000.com]]></description>\n";
echo "<link>http://why100000.com/</link>\n";
echo "<language>zh-cn</language>\n";
echo "<docs>WHY100000.COM Document Center</docs>\n";
echo "<generator>Rss Generator By WWW.WHY100000.COM</generator>\n";
$title = "PPS 有图像没声音的四个解决方法";
$link = "http://www.why100000.com/show_answer.asp?autoid=1046&Path=_oa";
$description = "PPS 有图像没声音的四个解决方法：今天打开PPS，发现只有图像却听不到声音，其他的程序声音都是正常的，说明是PPS的问题了，那么怎么样解决这…\n";
$author = "why100000.com";
$pubDate = "2008-4-20 18:22:28";
create_item($title, $link, $description, $author, $pubDate);
echo "</channel></rss>\n";
function create_item($title_data, $link_data, $description_data, $author_data, $pubDate_data)
{
echo "<item>\n";
echo "<title><![CDATA[$title_data]]></title>\n";
echo "<link><![CDATA[$link_data]]></link>\n";
echo "<description><![CDATA[$description_data]]></description>\n";
echo "<author><![CDATA[$author_data]]></author>\n";
echo "<pubDate><![CDATA[$pubDate_data]]></pubDate>\n";
echo "</item>\n";
}
?>
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