本文实例讲述了php制作基于xml的RSS订阅源功能。分享给大家供大家参考，具体如下：
首先制作一个 RSS 模板，模板的文件名是 feed.xml，代码如下：
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<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0" xmlns:wfw="http://wellformedweb.org/CommentAPI/"></rss>
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再就是用php文件从数据库读取数据并生成 RSS 文件，这里用一个数组模拟从数据库读取的数据：
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<?php
class Rss{
protected $dom = null;
protected $temp = './feed.xml';
protected $rss = null;
protected $title = '';
protected $desc = '';
protected $link = '';
public function __construct(){
$this->title = '物理学';
$this->desc = '现代物理学';
$this->link = 'http://mysql/rss.php';
$this->dom = new DOMDocument('1.0','utf-8');
$this->dom->load($this->temp);
$this->rss = $this->dom->getElementsByTagName('rss')->item(0);
}
public function feed($arr){
$this->createChannel();
$channel = $this->dom->getElementsByTagName('channel')->item(0);
foreach ($arr as $v){
$channel->appendChild($this->createItem($v));
}
header('content-type:text/xml');
echo $this->dom->savexml();
}
protected function createChannel(){
$channel = $this->dom->createElement('channel');
$channel->appendChild($this->createEle('title',$this->title));
$channel->appendChild($this->createEle('link',$this->link));
$channel->appendChild($this->createEle('description',$this->desc));
$this->rss->appendChild($channel);
}
protected function createItem($arr){
$item = $this->dom->createElement('item');
foreach($arr as $k => $v){
$item->appendChild($this->createEle($k,$v));
}
return $item;
}
protected function createEle($name,$value){
$e=$this->dom->createElement($name);
$t=$this->dom->createTextNode($value);
$e->appendChild($t);
return $e;
}
}
$arr = array(
array(
'title'=>'牛顿力学',
'link'=>'1',
'description'=>'牛顿力学'
),
array(
'title'=>'相对论',
'link'=>'1',
'description'=>'爱因斯坦的相对论'
)
);
$rss = new Rss;
$rss->feed($arr);
?>
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最后在火狐下效果：
希望本文所述对大家PHP程序设计有所帮助。