制作Rss源

<?php 
/****
连接数据库，动态生成Rss Feed
****/

class feed{
	public $title = '';//channel的title
	public $link = '';//channel的link
	public $description = '';//channel的description

	public $template ='./feed.xml';//xml模板
	public $dom = null;

	public function __construct()//记得是双下划线
	{
		$this->dom = new DOMDocument('1.0','utf-8');
		$this->dom->load($this->template);
	}

	

	//封装createChannel方法，用来创建唯一且必须的channel节点
	public 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->description));

		$this->dom->appendChild($channel);
	}

	//调用createItem，把所有的item节点都生成
	public function display()
	{
		$this->createChannel();
		header('content-type:text/xml');
		echo $this->dom->savexml();

	}

	//封装一个方法，用来造item
	protected function createItem($arr)
	{
		$item = $this->dom->createElement('item');
		foreach ($$arr as $k => $v) {
			$item->appendChild($this->createEle($k,$v));
		}

		return $item;
	}

	//封装一个方法，直接创建如<ele>some text</ele>这样的节点
	protected function createEle($name,$value)
	{
		$ele = $this->dom->createElement($name);
		$text = $this->dom->createTextNode($value);

		$ele->appendChild($text);

		return $ele;
	}
}


$feed = new feed();
$feed->display();
?>

运行结果如下:

会用到的feed.xml如下：

<?xml version="1.0" encoding="utf-8"?>
<!-- rss输出模板 用php动态制造channel和item -->
<rss	version="2.0" xmlns:wfw="http://wellformedweb.org/CommentAPI">

</rss>