php RSS生成类

一个专门用来生成RSS的php类

/* E X A M P L E -----------------------------------------------
		$feed = new RSS();
		$feed->title       = "RSS Feed Title";
		$feed->link        = "http://website.com";
		$feed->description = "Recent articles on your website.";
 
		$db->query($query);
		$result = $db->result;
		while($row = mysql_fetch_array($result, MYSQL_ASSOC))
		{
			$item = new RSSItem();
			$item->title = $title;
			$item->link  = $link;
			$item->setPubDate($create_date); 
			$item->description = "<![CDATA[ $html ]]>";
			$feed->addItem($item);
		}
		echo $feed->serve();
	---------------------------------------------------------------- */
 
	class RSS
	{
		var $title;
		var $link;
		var $description;
		var $language = "en-us";
		var $pubDate;
		var $items;
		var $tags;
 
		function RSS()
		{
			$this->items = array();
			$this->tags  = array();
		}
 
		function addItem($item)
		{
			$this->items[] = $item;
		}
 
		function setPubDate($when)
		{
			if(strtotime($when) == false)
				$this->pubDate = date("D, d M Y H:i:s ", $when) . "GMT";
			else
				$this->pubDate = date("D, d M Y H:i:s ", strtotime($when)) . "GMT";
		}
 
		function getPubDate()
		{
  			if(empty($this->pubDate))
				return date("D, d M Y H:i:s ") . "GMT";
			else
				return $this->pubDate;
		}
 
		function addTag($tag, $value)
		{
			$this->tags[$tag] = $value;
		}
 
		function out()
		{
			$out  = $this->header();
			$out .= "<channel>\n";
			$out .= "<title>" . $this->title . "</title>\n";
			$out .= "<link>" . $this->link . "</link>\n";
			$out .= "<description>" . $this->description . "</description>\n";
			$out .= "<language>" . $this->language . "</language>\n";
			$out .= "<pubDate>" . $this->getPubDate() . "</pubDate>\n";
 
			foreach($this->tags as $key => $val) $out .= "<$key>$val</$key>\n";
			foreach($this->items as $item) $out .= $item->out();
 
			$out .= "</channel>\n";
 
			$out .= $this->footer();
 
			$out = str_replace("&", "&", $out);
 
			return $out;
		}
 
		function serve($contentType = "application/xml")
		{
			$xml = $this->out();
			header("Content-type: $contentType");
			echo $xml;
		}
 
		function header()
		{
			$out  = '<?xml version="1.0" encoding="utf-8"?>' . "\n";
			$out .= '<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/">' . "\n";
			return $out;
		}
 
		function footer()
		{
			return '</rss>';
		}
	}
 
	class RSSItem
	{
		var $title;
		var $link;
		var $description;
		var $pubDate;
		var $guid;
		var $tags;
		var $attachment;
		var $length;
		var $mimetype;
 
		function RSSItem()
		{ 
			$this->tags = array();
		}
 
		function setPubDate($when)
		{
			if(strtotime($when) == false)
				$this->pubDate = date("D, d M Y H:i:s ", $when) . "GMT";
			else
				$this->pubDate = date("D, d M Y H:i:s ", strtotime($when)) . "GMT";
		}
 
		function getPubDate()
		{
			if(empty($this->pubDate))
				return date("D, d M Y H:i:s ") . "GMT";
			else
				return $this->pubDate;
		}
 
		function addTag($tag, $value)
		{
			$this->tags[$tag] = $value;
		}
 
		function out()
		{
			$out .= "<item>\n";
			$out .= "<title>" . $this->title . "</title>\n";
			$out .= "<link>" . $this->link . "</link>\n";
			$out .= "<description>" . $this->description . "</description>\n";
			$out .= "<pubDate>" . $this->getPubDate() . "</pubDate>\n";
 
			if($this->attachment != "")
				$out .= "<enclosure url='{$this->attachment}' length='{$this->length}' type='{$this->mimetype}' />";
 
			if(empty($this->guid)) $this->guid = $this->link;
			$out .= "<guid>" . $this->guid . "</guid>\n";
 
			foreach($this->tags as $key => $val) $out .= "<$key>$val</$key\n>";
			$out .= "</item>\n";
			return $out;
		}
 
		function enclosure($url, $mimetype, $length)
		{
			$this->attachment = $url;
			$this->mimetype   = $mimetype;
			$this->length     = $length;
		}
	}