分享一个RSS类

RSS（简易信息聚合，也叫聚合内容）是一种描述和同步网站内容的格式。网络用户可以在客户端借助于支持RSS的聚合工具软件，在不打开网站内容页面的情况下阅读支持RSS输出的网站内容。
RSS的作用，就是帮助用户快速筛选获取网站最新更新的自己喜欢的内容，节省了到网站去搜寻的时间。似乎博客总是少不了RSS，下面分享一个我在WBlog程序中使用的一个RSS类
完整的代码：

<?php

// +----------------------------------------------------------------------

// | YBlog

// +----------------------------------------------------------------------

// | Copyright (c) 2008 http://www.yhustc.com All rights reserved.

// +----------------------------------------------------------------------

// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )

// +----------------------------------------------------------------------

// | Author: yhustc <yhustc@gmail.com>

// +----------------------------------------------------------------------

// $Id$

 

/**

 +------------------------------------------------------------------------------

 * RSS生成类

 +------------------------------------------------------------------------------

 * @author    yhustc <yhustc@gmail.com>

 * @version   $Id$

 +------------------------------------------------------------------------------

 */

class RSS

{

    /**

     +----------------------------------------------------------

     * RSS频道名

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $channel_title = '';

    /**

     +----------------------------------------------------------

     * RSS频道链接

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $channel_link = '';

    /**

     +----------------------------------------------------------

     * RSS频道描述

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $channel_description = '';

    /**

     +----------------------------------------------------------

     * RSS频道使用的小图标的URL

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $channel_imgurl = '';

    /**

     +----------------------------------------------------------

     * RSS频道所使用的语言

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $language = 'zh_CN';

    /**

     +----------------------------------------------------------

     * RSS文档创建日期，默认为今天

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $pubDate = '';

    protected $lastBuildDate = '';

 

    protected $generator = 'YBlog RSS Generator';

 

    /**

     +----------------------------------------------------------

     * RSS单条信息的数组

     +----------------------------------------------------------

     * @var string

     * @access protected

     +----------------------------------------------------------

     */

    protected $items = array();

 

    /**

     +----------------------------------------------------------

     * 构造函数

     +----------------------------------------------------------

     * @access public 

     +----------------------------------------------------------

     * @param string $title  RSS频道名

     * @param string $link  RSS频道链接

     * @param string $description  RSS频道描述

     * @param string $imgurl  RSS频道图标

     +----------------------------------------------------------

     */

    public function __construct($title, $link, $description, $imgurl = '')

    {

        $this->channel_title = $title;

        $this->channel_link = $link;

        $this->channel_description = $description;

        $this->channel_imgurl = $imgurl;

        $this->pubDate = Date('Y-m-d H:i:s', time());

        $this->lastBuildDate = Date('Y-m-d H:i:s', time());

    }

 

    /**

     +----------------------------------------------------------

     * 设置私有变量

     +----------------------------------------------------------

     * @access public 

     +----------------------------------------------------------

     * @param string $key  变量名

     * @param string $value  变量的值

     +----------------------------------------------------------

     */

     public function Config($key,$value)

     {

        $this->{$key} = $value;

     }

 

    /**

     +----------------------------------------------------------

     * 添加RSS项

     +----------------------------------------------------------

     * @access public 

     +----------------------------------------------------------

     * @param string $title  日志的标题

     * @param string $link  日志的链接

     * @param string $description  日志的摘要

     * @param string $pubDate  日志的发布日期

     +----------------------------------------------------------

     */

     function AddItem($title, $link, $description, $pubDate)

     {

        $this->items[] = array('title' => $title, 'link' => $link, 'description' => $description, 'pubDate' => $pubDate);

     }

 

     /**

     +----------------------------------------------------------

     * 输出RSS的XML为字符串

     +----------------------------------------------------------

     * @access public 

     +----------------------------------------------------------

     * @return string

     +----------------------------------------------------------

     */

    public function Fetch()

    {

        $rss = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\r\n";

        $rss = "<rss version=\"2.0\">\r\n";

        $rss .= "<channel>\r\n";

        $rss .= "<title><![CDATA[{$this->channel_title}]]></title>\r\n";

        $rss .= "<description><![CDATA[{$this->channel_description}]]></description>\r\n";

        $rss .= "<link>{$this->channel_link}</link>\r\n";

        $rss .= "<language>{$this->language}</language>\r\n";

 

        if (!empty($this->pubDate))

            $rss .= "<pubDate>{$this->pubDate}</pubDate>\r\n";

        if (!empty($this->lastBuildDate))

            $rss .= "<lastBuildDate>{$this->lastBuildDate}</lastBuildDate>\r\n";

        if (!empty($this->generator))

            $rss .= "<generator>{$this->generator}</generator>\r\n";

 

        $rss .= "<ttl>5</ttl>\r\n";

 

        if (!empty($this->channel_imgurl)) {

            $rss .= "<image>\r\n";

            $rss .= "<title><![CDATA[{$this->channel_title}]]></title>\r\n";

            $rss .= "<link>{$this->channel_link}</link>\r\n";

            $rss .= "<url>{$this->channel_imgurl}</url>\r\n";

            $rss .= "</image>\r\n";

        }

 

        for ($i = 0; $i < count($this->items); $i++) {

            $rss .= "<item>\r\n";

            $rss .= "<title><![CDATA[{$this->items[$i]['title']}]]></title>\r\n";

            $rss .= "<link>{$this->items[$i]['link']}</link>\r\n";

            $rss .= "<description><![CDATA[{$this->items[$i]['description']}]]></description>\r\n";

            $rss .= "<pubDate>{$this->items[$i]['pubDate']}</pubDate>\r\n";

            $rss .= "</item>\r\n";

        }

 

        $rss .= "</channel>\r\n</rss>";

        return $rss;

    }

 

    /**

     +----------------------------------------------------------

     * 输出RSS的XML到浏览器

     +----------------------------------------------------------

     * @access public 

     +----------------------------------------------------------

     * @return void

     +----------------------------------------------------------

     */

    public function Display()

    {

        header("Content-Type: text/xml; charset=utf-8");

        echo $this->Fetch();

        exit;

    }

}

?>

 在thinkphp控制器中的调用方法

<?php

02	class FeedAction extends Action {

03

04

// 首页

05	public function index() {

06	$Bloginfo = M('Bloginfo')->find();//查询bloginfo表的一行记录

07

08	$Bloglist = D('News')->order('id')->limit(10)->select();//查询news表的记录

09

10	import("@.ORG.Rss");//加载Rss.class.php类文件,我放在前台项目Lib/ORG目录中。

11

12	$RSS = new RSS($Bloginfo['name'],'',$Bloginfo['description'],'');//初始化类，给RSS加上标题及描述信息，具体参数看构造器__construct

13

14	foreach($Bloglist as $list){ //遍历$Bloglist

15	$RSS->AddItem($list['title'],U('/Web/'.$list['id']),$list['content'],$list['ctime']);

16

}

17	$RSS->Display();//输出日记列表,不需要模板。

18

}

19

20

}

21

22

?>

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