PHP生成RSS订阅的程序代码

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。下面的生成RSS订阅的代码：
rss XML结构

<pre class=\"brush:xml;toolbar:false\"><?xml version="1.0" encoding="utf-8"?> <rss version="2.0"> <channel> <title>网站名称</title> <link>http://www.jiaochengji.com/</link> <description>网站描述!</description> <item> <title>RSS Tutorial</title> <link>网站地址/rss</link> <description>New RSS tutorial on W3School</description> </item> <item> <title>XML Tutorial</title> <link>网站地址/xml</link> <description>New XML tutorial on W3School</description> </item> </channel> </rss></pre>

RSS实例

<pre class=\"brush:php;toolbar:false\"><?php class Rss { public function createFeed() { //RSS头部 $webUrl = 'http://'.$_SERVER['HTTP_HOST'];//网站地址 $webName = '网站名称';    //网站名称 $webDesc = '网站描述';    //网站描述 $html = '<?xml version="1.0" encoding="utf-8"?> <rss version="2.0"> <channel> <title>'.$webName.'</title> <link>'.$webUrl.'</link> <description>'.$webDesc.'</description> '.$this->createItem().' </channel> </rss> '; echo $html; } private function createItem() { //RSS item //$data可替换为自己的数据 $html = ''; //文章数据 $data = array( 'id' => 1, 'date' => date('r', time()), 'title' => '文章标题', 'link' => 'http://www.jiaochengji.com',    //文章地址 'description' => '网站描述' ); for($i = 0; $i < 6; $i ) { $html .= ' <item> <title>'.$data['title'].'</title> <link>'.$data['link'].'</link> <pubDate>'.$data['date'].'</pubDate> <description><![CDATA['.$data['description'].']]></description> </item> '; } return $html; } } header("Content-Type: text/xml; charset=utf-8"); $rss = new Rss(); $rss->createFeed(); exit; ?></pre>

RSS Feed 生成后，如何设置才能给网站添加 RSS 呢？并且让 Firefox、IE7 或其它 Feed 机器人自动发现？很简单，在网页的 Head 节添加一个特定的 Link 标签即可，如下：
<link rel=”alternate” type=”application/rss xml” title=”网站名称 RSS Feed” href=”http://www.jiaochengji.com” />
设置 title 为 Feed 标题，href 为 Feed 地址，一切就 OK 了！

例子2

<pre class=\"brush:xml;toolbar:false\"><?xml version="1.0" encoding="utf-8"?> <rss version="2.0"> <channel> <title>php程序员教程网</title> <link>http://www.jiaochengji.com/</link> <description>本站是一个php程序员的工作生活笔记!</description> <item> <title>RSS Tutorial</title> <link>网站地址/rss</link> <description>New RSS tutorial on W3School</description> </item> <item> <title>XML Tutorial</title> <link>网站地址/xml</link> <description>New XML tutorial on W3School</description> </item> </channel> </rss></pre>

下面分享一段使用 php 动态生成 RSS 的代码示例：

<pre class=\"brush:php;toolbar:false\"><?php /** ** php 动态生成 RSS 类 **/ define("TIME_ZONE",""); define("FEEDCREATOR_VERSION","www.jiaochengji.com");//您的网址 class FeedItem extends HtmlDescribable{  var $title,$description,$link;  var $author,$authorEmail,$image,$category,$comments,$guid,$source,$creator;  var $date;  var $additionalElements=Array(); } class FeedImage extends HtmlDescribable{  var $title,$url,$link;  var $width,$height,$description; } class HtmlDescribable{  var $descriptionHtmlSyndicated;  var $descriptionTruncSize;  function getDescription(){   $descriptionField=new FeedHtmlField($this->description);   $descriptionField->syndicateHtml=$this->descriptionHtmlSyndicated;   $descriptionField->truncSize=$this->descriptionTruncSize;   return $descriptionField->output();  } } class FeedHtmlField{  var $rawFieldContent;  var $truncSize,$syndicateHtml;  function FeedHtmlField($parFieldContent){   if($parFieldContent){    $this->rawFieldContent=$parFieldContent;   }  }  function output(){   if(!$this->rawFieldContent){    $result="";   }    elseif($this->syndicateHtml){    $result="<![CDATA[".$this->rawFieldContent."]]>";   }else{    if($this->truncSize and is_int($this->truncSize)){     $result=FeedCreator::iTrunc(htmlspecialchars($this->rawFieldContent),$this->truncSize);    }else{     $result=htmlspecialchars($this->rawFieldContent);    }   }   return $result;  } } class UniversalFeedCreator extends FeedCreator{  var $_feed;  function _setFormat($format){   switch (strtoupper($format)){    case "2.0":     // fall through    case "RSS2.0":     $this->_feed=new RSSCreator20();     break;    case "0.91":     // fall through    case "RSS0.91":     $this->_feed=new RSSCreator091();     break;    default:     $this->_feed=new RSSCreator091();     break;   }   $vars=get_object_vars($this);   cssStyleSheet) $xml .= "<?xml-stylesheet href=\\"".$this->cssStyleSheet."\\" type=\\"text/css\\"?>\\n";   if($this->xslStyleSheet) $xml .= "<?xml-stylesheet href=\\"".$this->xslStyleSheet."\\" type=\\"text/xsl\\"?>\\n";   return $xml;  }  function createFeed(){}  function _generateFilename(){   $fileInfo=pathinfo($_SERVER["PHP_SELF"]);   return substr($fileInfo["basename"],0,-(strlen($fileInfo["extension"]) 1)).".xml";  }  function _redirect($filename){   Header("Content-Type: ".$this->contentType."; charset=".$this->encoding."; filename=".basename($filename));   Header("Content-Disposition: inline; filename=".basename($filename));   readfile($filename,"r");   die();  }  function useCached($filename="",$timeout=3600){   $this->_timeout=$timeout;   if($filename==""){    $filename=$this->_generateFilename();   }   if(file_exists($filename) && (time()-filemtime($filename) < $timeout)){    $this->_redirect($filename);   }  }  function saveFeed($filename="",$displayContents=true){   if($filename==""){    $filename=$this->_generateFilename();   }   $feedFile=fopen($filename,"w ");   if($feedFile){    fputs($feedFile,$this->createFeed());    fclose($feedFile);    if($displayContents){     $this->_redirect($filename);    }   }else{    echo "<br /><b>Error creating feed file, please check write permissions.</b><br />";   }  } } class FeedDate{  var $unix;  function FeedDate($dateString=""){   if($dateString=="") $dateString=date("r");   if(is_integer($dateString)){    $this->unix=$dateString;    return;   }   if(preg_match("~(?:(?:Mon|Tue|Wed|Thu|Fri|Sat|Sun),\\\\s )?(\\\\d{1,2})\\\\s ([a-zA-Z]{3})\\\\s (\\\\d{4})\\\\s (\\\\d{2}):(\\\\d{2}):(\\\\d{2})\\\\s (.*)~",$dateString,$matches)){    $months=Array("Jan"=>1,"Feb"=>2,"Mar"=>3,"Apr"=>4,"May"=>5,"Jun"=>6,"Jul"=>7,"Aug"=>8,"Sep"=>9,"Oct"=>10,"Nov"=>11,"Dec"=>12);    $this->unix=mktime($matches[4],$matches[5],$matches[6],$months[$matches[2]],$matches[1],$matches[3]);    if(substr($matches[7],0,1)==' ' OR substr($matches[7],0,1)=='-'){     $tzOffset=(substr($matches[7],0,3) * 60   substr($matches[7],-2)) * 60;    }else{     if(strlen($matches[7])==1){      $oneHour=3600;      $ord=ord($matches[7]);      if($ord < ord("M")){       $tzOffset=(ord("A") - $ord - 1) * $oneHour;      } elseif($ord >= ord("M") && $matches[7]!="Z"){       $tzOffset=($ord - ord("M")) * $oneHour;      } elseif($matches[7]=="Z"){       $tzOffset=0;      }     }     switch ($matches[7]){      case "UT":      case "GMT":    $tzOffset=0;     }    }    $this->unix  = $tzOffset;    return;   }   if(preg_match("~(\\\\d{4})-(\\\\d{2})-(\\\\d{2})T(\\\\d{2}):(\\\\d{2}):(\\\\d{2})(.*)~",$dateString,$matches)){    $this->unix=mktime($matches[4],$matches[5],$matches[6],$matches[2],$matches[3],$matches[1]);    if(substr($matches[7],0,1)==' ' OR substr($matches[7],0,1)=='-'){     $tzOffset=(substr($matches[7],0,3) * 60   substr($matches[7],-2)) * 60;    }else{     if($matches[7]=="Z"){      $tzOffset=0;     }    }    $this->unix  = $tzOffset;    return;   }   $this->unix=0;  }  function rfc822(){   $date=gmdate("Y-m-d H:i:s",$this->unix);   if(TIME_ZONE!="") $date .= " ".str_replace(":","",TIME_ZONE);   return $date;  }  function iso8601(){   $date=gmdate("Y-m-d H:i:s",$this->unix);   $date=substr($date,0,22) . ':' . substr($date,-2);   if(TIME_ZONE!="") $date=str_replace(" 00:00",TIME_ZONE,$date);   return $date;  }  function unix(){   return $this->unix;  } } class RSSCreator10 extends FeedCreator{  function createFeed(){   $feed="<?xml version=\\"1.0\\" encoding=\\"".$this->encoding."\\"?>\\n";   $feed.= $this->_createGeneratorComment();   if($this->cssStyleSheet==""){    $cssStyleSheet="http://www.w3.org/2000/08/w3c-synd/style.css";   }   $feed.= $this->_createStylesheetReferences();   $feed.= "<rdf:RDF\\n";   $feed.= "    xmlns=\\"http://purl.org/rss/1.0/\\"\\n";   $feed.= "    xmlns:rdf=\\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\\"\\n";   $feed.= "    xmlns:slash=\\"http://purl.org/rss/1.0/modules/slash/\\"\\n";   $feed.= "    xmlns:dc=\\"http://purl.org/dc/elements/1.1/\\">\\n";   $feed.= "    <channel rdf:about=\\"".$this->syndicationURL."\\">\\n";   $feed.= "        <title>".htmlspecialchars($this->title)."</title>\\n";   $feed.= "        <description>".htmlspecialchars($this->description)."</description>\\n";   $feed.= "        <link>".$this->link."</link>\\n";   if($this->image!=null){    $feed.= "        <image rdf:resource=\\"".$this->image->url."\\" />\\n";   }   $now=new FeedDate();   $feed.= "       <dc:date>".htmlspecialchars($now->iso8601())."</dc:date>\\n";   $feed.= "        <items>\\n";   $feed.= "            <rdf:Seq>\\n";   for ($i=0;$i<count($this->items);$i ){    $feed.= "                <rdf:li rdf:resource=\\"".htmlspecialchars($this->items[$i]->link)."\\"/>\\n";   }   $feed.= "            </rdf:Seq>\\n";   $feed.= "        </items>\\n";   $feed.= "    </channel>\\n";   if($this->image!=null){    $feed.= "    <image rdf:about=\\"".$this->image->url."\\">\\n";    $feed.= "        <title>".$this->image->title."</title>\\n";    $feed.= "        <link>".$this->image->link."</link>\\n";    $feed.= "        <url>".$this->image->url."</url>\\n";    $feed.= "    </image>\\n";   }   $feed.= $this->_createAdditionalElements($this->additionalElements,"    ");   for ($i=0;$i<count($this->items);$i ){    $feed.= "    <item rdf:about=\\"".htmlspecialchars($this->items[$i]->link)."\\">\\n";    //$feed.= "        <dc:type>Posting</dc:type>\\n";    $feed.= "        <dc:format>text/html</dc:format>\\n";    if($this->items[$i]->date!=null){     $itemDate=new FeedDate($this->items[$i]->date);     $feed.= "        <dc:date>".htmlspecialchars($itemDate->iso8601())."</dc:date>\\n";    }    if($this->items[$i]->source!=""){     $feed.= "        <dc:source>".htmlspecialchars($this->items[$i]->source)."</dc:source>\\n";    }    if($this->items[$i]->author!=""){     $feed.= "        <dc:creator>".htmlspecialchars($this->items[$i]->author)."</dc:creator>\\n";    }    $feed.= "        <title>".htmlspecialchars(strip_tags(strtr($this->items[$i]->title,"\\n\\r","  ")))."</title>\\n";    $feed.= "        <link>".htmlspecialchars($this->items[$i]->link)."</link>\\n";    $feed.= "        <description>".htmlspecialchars($this->items[$i]->description)."</description>\\n";    $feed.= $this->_createAdditionalElements($this->items[$i]->additionalElements,"        ");    $feed.= "    </item>\\n";   }   $feed.= "</rdf:RDF>\\n";   return $feed;  } } class RSSCreator091 extends FeedCreator{  var $RSSVersion;  function RSSCreator091(){   $this->_setRSSVersion("0.91");   $this->contentType="application/rss xml";  }  function _setRSSVersion($version){   $this->RSSVersion=$version;  }  function createFeed(){   $feed="<?xml version=\\"1.0\\" encoding=\\"".$this->encoding."\\"?>\\n";   $feed.= $this->_createGeneratorComment();   $feed.= $this->_createStylesheetReferences();   $feed.= "<rss version=\\"".$this->RSSVersion."\\">\\n";   $feed.= "    <channel>\\n";   $feed.= "        <title>".FeedCreator::iTrunc(htmlspecialchars($this->title),100)."</title>\\n";   $this->descriptionTruncSize=500;   $feed.= "        <description>".$this->getDescription()."</description>\\n";   $feed.= "        <link>".$this->link."</link>\\n";   $now=new FeedDate();   $feed.= "        <lastBuildDate>".htmlspecialchars($now->rfc822())."</lastBuildDate>\\n";   $feed.= "        <generator>".FEEDCREATOR_VERSION."</generator>\\n";   if($this->image!=null){    $feed.= "        <image>\\n";    $feed.= "            <url>".$this->image->url."</url>\\n";    $feed.= "            <title>".FeedCreator::iTrunc(htmlspecialchars($this->image->title),100)."</title>\\n";    $feed.= "            <link>".$this->image->link."</link>\\n";    if($this->image->width!=""){     $feed.= "            <width>".$this->image->width."</width>\\n";    }    if($this->image->height!=""){     $feed.= "            <height>".$this->image->height."</height>\\n";    }    if($this->image->description!=""){     $feed.= "            <description>".$this->image->getDescription()."</description>\\n";    }    $feed.= "        </image>\\n";   }   if($this->language!=""){    $feed.= "        <language>".$this->language."</language>\\n";   }   if($this->copyright!=""){    $feed.= "        <copyright>".FeedCreator::iTrunc(htmlspecialchars($this->copyright),100)."</copyright>\\n";   }   if($this->editor!=""){    $feed.= "        <managingEditor>".FeedCreator::iTrunc(htmlspecialchars($this->editor),100)."</managingEditor>\\n";   }   if($this->webmaster!=""){    $feed.= "        <webMaster>".FeedCreator::iTrunc(htmlspecialchars($this->webmaster),100)."</webMaster>\\n";   }   if($this->pubDate!=""){    $pubDate=new FeedDate($this->pubDate);    $feed.= "        <pubDate>".htmlspecialchars($pubDate->rfc822())."</pubDate>\\n";   }   if($this->category!=""){    $feed.= "        <category>".htmlspecialchars($this->category)."</category>\\n";   }   if($this->docs!=""){    $feed.= "        <docs>".FeedCreator::iTrunc(htmlspecialchars($this->docs),500)."</docs>\\n";   }   if($this->ttl!=""){    $feed.= "        <ttl>".htmlspecialchars($this->ttl)."</ttl>\\n";   }   if($this->rating!=""){    $feed.= "        <rating>".FeedCreator::iTrunc(htmlspecialchars($this->rating),500)."</rating>\\n";   }   if($this->skipHours!=""){    $feed.= "        <skipHours>".htmlspecialchars($this->skipHours)."</skipHours>\\n";   }   if($this->skipDays!=""){    $feed.= "        <skipDays>".htmlspecialchars($this->skipDays)."</skipDays>\\n";   }   $feed.= $this->_createAdditionalElements($this->additionalElements,"    ");   for ($i=0;$i<count($this->items);$i ){    $feed.= "        <item>\\n";    $feed.= "            <title>".FeedCreator::iTrunc(htmlspecialchars(strip_tags($this->items[$i]->title)),100)."</title>\\n";    $feed.= "            <link>".htmlspecialchars($this->items[$i]->link)."</link>\\n";    $feed.= "            <description>".$this->items[$i]->getDescription()."</description>\\n";    if($this->items[$i]->author!=""){     $feed.= "            <author>".htmlspecialchars($this->items[$i]->author)."</author>\\n";    }    /*     // on hold     if($this->items[$i]->source!=""){     $feed.= "            <source>".htmlspecialchars($this->items[$i]->source)."</source>\\n";     }     */    if($this->items[$i]->category!=""){     $feed.= "            <category>".htmlspecialchars($this->items[$i]->category)."</category>\\n";    }    if($this->items[$i]->comments!=""){     $feed.= "            <comments>".htmlspecialchars($this->items[$i]->comments)."</comments>\\n";    }    if($this->items[$i]->date!=""){     $itemDate=new FeedDate($this->items[$i]->date);     $feed.= "            <pubDate>".htmlspecialchars($itemDate->rfc822())."</pubDate>\\n";    }    if($this->items[$i]->guid!=""){     $feed.= "            <guid>".htmlspecialchars($this->items[$i]->guid)."</guid>\\n";    }    $feed.= $this->_createAdditionalElements($this->items[$i]->additionalElements,"        ");    $feed.= "        </item>\\n";   }   $feed.= "    </channel>\\n";   $feed.= "</rss>\\n";   return $feed;  } } class RSSCreator20 extends RSSCreator091{  function RSSCreator20(){   parent::_setRSSVersion("2.0");  } }</pre>

使用示例：

<pre class=\"brush:php;toolbar:false\"><?php header('Content-Type:text/html; charset=utf-8'); $db=mysql_connect('127.0.0.1','root','123456'); mysql_query("set names utf8"); mysql_select_db('dbname',$db); $brs=mysql_query('select * from article order by add_time desc limit 0,10',$db); $rss=new UniversalFeedCreator(); $rss->title="页面标题"; $rss->link="网址http://"; $rss->description="rss标题"; while($rowbrs=mysql_fetch_array($brs)){  $item=new FeedItem();  $item->title =$rowbrs['subject'];  $item->link='http://www.jiaochengji.com/';  $item->description =$rowbrs['description'];  $rss->addItem($item); } mysql_close($db); $rss->saveFeed("RSS2.0","rss.xml");</pre>

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