php 生成RSS文件类实例代码

<?php    if (defined(&#39;_class_rss_php&#39;)) return;   define(&#39;_class_rss_php教程&#39;,1);     class rss {      //public      $rss_ver = "2.0";      $channel_title = &#39;&#39;;      $channel_link = &#39;&#39;;      $channel_description = &#39;&#39;;      $language = &#39;zh_cn&#39;;      $copyright = &#39;&#39;;      $webmaster = &#39;&#39;;      $pubdate = &#39;&#39;;      $lastbuilddate = &#39;&#39;;      $generator = &#39;redfox rss generator&#39;;         $content = &#39;&#39;;      $items = array();         function rss($title, $link, $description) {          $this->channel_title = $title;          $this-&gt;channel_link = $link;          $this-&gt;channel_description = $description;          $this-&gt;pubdate = date('y-m-d h:i:s',time());          $this-&gt;lastbuilddate = date('y-m-d h:i:s',time());      }         function additem($title, $link, $description ,$pubdate) {          $this-&gt;items[] = array('titile' =&gt; $title ,                           'link' =&gt; $link,                           'description' =&gt; $description,                           'pubdate' =&gt; $pubdate);      }         function buildrss() {          $s = "<!--l version="1.0" encoding="gb2312"--> ";          // start channel          $s .= " ";          $s .= " "          $s .= "<link>{$this-&gt;channel_link} ";          $s .= "{$this-&gt;channel_description} ";          $s .= "{$this-&gt;language} ";          if (!emptyempty($this-&gt;copyright)) {             $s .= "{$this-&gt;copyright} ";          }          if (!emptyempty($this-&gt;webmaster)) {             $s .= "{$this-&gt;webmaster} ";          }          if (!emptyempty($this-&gt;pubdate)) {             $s .= "{$this-&gt;pubdate} ";          }             if (!emptyempty($this-&gt;lastbuilddate)) {             $s .= "{$this-&gt;lastbuilddate} ";          }             if (!emptyempty($this-&gt;generator)) {             $s .= "{$this-&gt;generator} ";          }                   // start items          for ($i=0;$iitems),$i++) {              $s .= " ";              $s .= " ";              $s .= "<link>{$this-&gt;items[$i]['link']} ";              $s .= "<!--data[{$thi-->items[$i]['description']}]]&gt; ";              $s .= "{$this-&gt;items[$i]['pubdate']} ";                        $s .= " ";          }                 // close channel         $s .= " ";         $this-&gt;content = $s;      }         function show() {          if (emptyempty($this-&gt;content)) $this-&gt;buildrss();          header('content-type:text/xml');          echo($this-&gt;content);      }         function savetofile($fname) {          if (emptyempty($this-&gt;content)) $this-&gt;buildrss();          $handle = fopen($fname, 'wb');          if ($handle === false)  return false;          fwrite($handle, $this-&gt;content);          fclose($handle);      }   }   ?&gt;