PHP生成RSS文件类实例

<?php 
if (defined('_class_rss_php')) return; 
define('_class_rss_php教程',1); 
/** 
 
 *  使用说明： 
 *  $rss = new rss('redfox','http://bbs.vevb.com/',"redfox's blog"); 
 *  $rss->additem('rss class',"http://www.vevb.com","xxx",date()); 
 *  $rss->additem(...); 
 *  $rss->savetofile(...); 
 */ 
 
class rss { 
   //public 
   $rss_ver = "2.0"; 
   $channel_title = ''; 
   $channel_link = ''; 
   $channel_description = ''; 
   $language = 'zh_cn'; 
   $copyright = ''; 
   $webmaster = ''; 
   $pubdate = ''; 
   $lastbuilddate = ''; 
   $generator = 'redfox rss generator'; 
 
   $content = ''; 
   $items = array(); 
 
   function rss($title, $link, $description) { 
       $this->channel_title = $title; 
       $this->channel_link = $link; 
       $this->channel_description = $description; 
       $this->pubdate = date('y-m-d h:i:s',time()); 
       $this->lastbuilddate = date('y-m-d h:i:s',time()); 
   } 
 
   function additem($title, $link, $description ,$pubdate) { 
       $this->items[] = array('titile' => $title , 
                        'link' => $link, 
                        'description' => $description, 
                        'pubdate' => $pubdate); 
   } 
 
   function buildrss() { 
       $s = "<!--l version="1.0" encoding="gb2312"--> "; 
       // start channel 
       $s .= " "; 
       $s .= " " 
       $s .= "<link />{$this->channel_link} "; 
       $s .= "{$this->channel_description} "; 
       $s .= "{$this->language} "; 
       if (!emptyempty($this->copyright)) { 
          $s .= "{$this->copyright} "; 
       } 
       if (!emptyempty($this->webmaster)) { 
          $s .= "{$this->webmaster} "; 
       } 
       if (!emptyempty($this->pubdate)) { 
          $s .= "{$this->pubdate} "; 
       } 
 
       if (!emptyempty($this->lastbuilddate)) { 
          $s .= "{$this->lastbuilddate} "; 
       } 
 
       if (!emptyempty($this->generator)) { 
          $s .= "{$this->generator} "; 
       } 
       
       // start items 
       for ($i=0;$iitems),$i++) { 
           $s .= " "; 
           $s .= " "; 
           $s .= "<link />{$this->items[$i]['link']} "; 
           $s .= "<!--data[{$thi-->items[$i]['description']}]]> "; 
           $s .= "{$this->items[$i]['pubdate']} ";           
           $s .= " "; 
       } 
      
      // close channel 
      $s .= " "; 
      $this->content = $s; 
   } 
 
   function show() { 
       if (emptyempty($this->content)) $this->buildrss(); 
       header('content-type:text/xml'); 
       echo($this->content); 
   } 
 
   function savetofile($fname) { 
       if (emptyempty($this->content)) $this->buildrss(); 
       $handle = fopen($fname, 'wb'); 
       if ($handle === false)  return false; 
       fwrite($handle, $this->content); 
       fclose($handle); 
   } 
} 
?>