下面分享一段使用 php 动态生成 RSS 的代码示例：
<p><?php</p>/**<br />** php 动态生成 RSS 类<br />**/<br />define("TIME_ZONE","");<br />define("FEEDCREATOR_VERSION","www.scutephp.com");//您的网址<br />class FeedItem extends HtmlDescribable{<br /> var $title,$description,$link;<br /> var $author,$authorEmail,$image,$category,$comments,$guid,$source,$creator;<br /> var $date;<br /> var $additionalElements=Array();<br />}<br /><br />class FeedImage extends HtmlDescribable{<br /> var $title,$url,$link;<br /> var $width,$height,$description;<br />}<br /><br />class HtmlDescribable{<br /> var $descriptionHtmlSyndicated;<br /> var $descriptionTruncSize;<br /><br /> function getDescription(){<br /> $descriptionField=new FeedHtmlField($this->description);<br /> $descriptionField->syndicateHtml=$this->descriptionHtmlSyndicated;<br /> $descriptionField->truncSize=$this->descriptionTruncSize;<br /> return $descriptionField->output();<br /> }<br />}<br /><br />class FeedHtmlField{<br /> var $rawFieldContent;<br /> var $truncSize,$syndicateHtml;<br /> function FeedHtmlField($parFieldContent){<br /> if($parFieldContent){<br /> $this->rawFieldContent=$parFieldContent;<br /> }<br /> }<br /> function output(){<br /> if(!$this->rawFieldContent){<br /> $result="";<br /> } elseif($this->syndicateHtml){<br /> $result="<![CDATA[".$this->rawFieldContent."]]>";<br /> }else{<br /> if($this->truncSize and is_int($this->truncSize)){<br /> $result=FeedCreator::iTrunc(htmlspecialchars($this->rawFieldContent),$this->truncSize);<br /> }else{<br /> $result=htmlspecialchars($this->rawFieldContent);<br /> }<br /> }<br /> return $result;<br /> }<br /><br />}<br /><br />class UniversalFeedCreator extends FeedCreator{<br /> var $_feed;<br /><br /> function _setFormat($format){<br /> switch (strtoupper($format)){<br /> case "2.0":<br /> // fall through<br /> case "RSS2.0":<br /> $this->_feed=new RSSCreator20();<br /> break;<br /> case "0.91":<br /> // fall through<br /> case "RSS0.91":<br /> $this->_feed=new RSSCreator091();<br /> break;<br /> default:<br /> $this->_feed=new RSSCreator091();<br /> break;<br /> }<br /><br /> $vars=get_object_vars($this);<br /> foreach ($vars as $key => $value){<br /> // prevent overwriting of properties "contentType","encoding"; do not copy "_feed" itself<br /> if(!in_array($key, array("_feed","contentType","encoding"))){<br /> $this->_feed->{$key}=$this->{$key};<br /> }<br /> }<br /> }<br /><br /> function createFeed($format="RSS0.91"){<br /> $this->_setFormat($format);<br /> return $this->_feed->createFeed();<br /> }<br /><br /> function saveFeed($format="RSS0.91",$filename="",$displayContents=true){<br /> $this->_setFormat($format);<br /> $this->_feed->saveFeed($filename,$displayContents);<br /> }<br /><br /> function useCached($format="RSS0.91",$filename="",$timeout=3600){<br /> $this->_setFormat($format);<br /> $this->_feed->useCached($filename,$timeout);<br /> }<br /><br />}<br /><br />class FeedCreator extends HtmlDescribable{<br /> var $title,$description,$link;<br /> var $syndicationURL,$image,$language,$copyright,$pubDate,$lastBuildDate,$editor,$editorEmail,$webmaster,$category,$docs,$ttl,$rating,$skipHours,$skipDays;<br /> var $xslStyleSheet="";<br /> var $items=Array();<br /> var $contentType="application/xml";<br /> var $encoding="utf-8";<br /> var $additionalElements=Array();<br /><br /> function addItem($item){<br /> $this->items[]=$item;<br /> }<br /><br /> function clearItem2Null(){<br /> $this->items=array();<br /> }<br /><br /> function iTrunc($string,$length){<br /> if(strlen($string)<=$length){<br /> return $string;<br /> }<br /><br /> $pos=strrpos($string,".");<br /> if($pos>=$length-4){<br /> $string=substr($string,0,$length-4);<br /> $pos=strrpos($string,".");<br /> }<br /> if($pos>=$length*0.4){<br /> return substr($string,0,$pos+1)." ...";<br /> }<br /><br /> $pos=strrpos($string," ");<br /> if($pos>=$length-4){<br /> $string=substr($string,0,$length-4);<br /> $pos=strrpos($string," ");<br /> }<br /> if($pos>=$length*0.4){<br /> return substr($string,0,$pos)." ...";<br /> }<br /><br /> return substr($string,0,$length-4)." ...";<br /> }<br /><br /><br /> function _createGeneratorComment(){<br /> return "<!-- generator=\"".FEEDCREATOR_VERSION."\" -->\n";<br /> }<br /><br /> function _createAdditionalElements($elements,$indentString=""){<br /> $ae="";<br /> if(is_array($elements)){<br /> foreach($elements AS $key => $value){<br /> $ae.= $indentString."<$key>$value</$key>\n";<br /> }<br /> }<br /> return $ae;<br /> }<br /><br /> function _createStylesheetReferences(){<br /> $xml="";<br /> if($this->cssStyleSheet) $xml .= "<?xml-stylesheet href=\"".$this->cssStyleSheet."\" type=\"text/css\"?>\n";<br /> if($this->xslStyleSheet) $xml .= "<?xml-stylesheet href=\"".$this->xslStyleSheet."\" type=\"text/xsl\"?>\n";<br /> return $xml;<br /> }<br /><br /> function createFeed(){}<br /><br /> function _generateFilename(){<br /> $fileInfo=pathinfo($_SERVER["PHP_SELF"]);<br /> return substr($fileInfo["basename"],0,-(strlen($fileInfo["extension"])+1)).".xml";<br /> }<br /><br /> function _redirect($filename){<br /> Header("Content-Type: ".$this->contentType."; charset=".$this->encoding."; filename=".basename($filename));<br /> Header("Content-Disposition: inline; filename=".basename($filename));<br /> readfile($filename,"r");<br /> die();<br /> }<br /><br /> function useCached($filename="",$timeout=3600){<br /> $this->_timeout=$timeout;<br /> if($filename==""){<br /> $filename=$this->_generateFilename();<br /> }<br /> if(file_exists($filename) && (time()-filemtime($filename) < $timeout)){<br /> $this->_redirect($filename);<br /> }<br /> }<br /><br /> function saveFeed($filename="",$displayContents=true){<br /> if($filename==""){<br /> $filename=$this->_generateFilename();<br /> }<br /> $feedFile=fopen($filename,"w+");<br /> if($feedFile){<br /> fputs($feedFile,$this->createFeed());<br /> fclose($feedFile);<br /> if($displayContents){<br /> $this->_redirect($filename);<br /> }<br /> }else{<br /> echo "<br /><b>Error creating feed file, please check write permissions.</b><br />";<br /> }<br /> }<br /><br />}<br /><br />class FeedDate{<br /> var $unix;<br /> function FeedDate($dateString=""){<br /> if($dateString=="") $dateString=date("r");<br /><br /> if(is_integer($dateString)){<br /> $this->unix=$dateString;<br /> return;<br /> }<br /> 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)){<br /> $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);<br /> $this->unix=mktime($matches[4],$matches[5],$matches[6],$months[$matches[2]],$matches[1],$matches[3]);<br /> if(substr($matches[7],0,1)=='+' OR substr($matches[7],0,1)=='-'){<br /> $tzOffset=(substr($matches[7],0,3) * 60 + substr($matches[7],-2)) * 60;<br /> }else{<br /> if(strlen($matches[7])==1){<br /> $oneHour=3600;<br /> $ord=ord($matches[7]);<br /> if($ord < ord("M")){<br /> $tzOffset=(ord("A") - $ord - 1) * $oneHour;<br /> } elseif($ord >= ord("M") && $matches[7]!="Z"){<br /> $tzOffset=($ord - ord("M")) * $oneHour;<br /> } elseif($matches[7]=="Z"){<br /> $tzOffset=0;<br /> }<br /> }<br /> switch ($matches[7]){<br /> case "UT":<br /> case "GMT": $tzOffset=0;<br /> }<br /> }<br /> $this->unix += $tzOffset;<br /> return;<br /> }<br /> if(preg_match("~(\\d{4})-(\\d{2})-(\\d{2})T(\\d{2}):(\\d{2}):(\\d{2})(.*)~",$dateString,$matches)){<br /> $this->unix=mktime($matches[4],$matches[5],$matches[6],$matches[2],$matches[3],$matches[1]);<br /> if(substr($matches[7],0,1)=='+' OR substr($matches[7],0,1)=='-'){<br /> $tzOffset=(substr($matches[7],0,3) * 60 + substr($matches[7],-2)) * 60;<br /> }else{<br /> if($matches[7]=="Z"){<br /> $tzOffset=0;<br /> }<br /> }<br /> $this->unix += $tzOffset;<br /> return;<br /> }<br /> $this->unix=0;<br /> }<br /><br /> function rfc822(){<br /> $date=gmdate("Y-m-d H:i:s",$this->unix);<br /> if(TIME_ZONE!="") $date .= " ".str_replace(":","",TIME_ZONE);<br /> return $date;<br /> }<br /><br /> function iso8601(){<br /> $date=gmdate("Y-m-d H:i:s",$this->unix);<br /> $date=substr($date,0,22) . ':' . substr($date,-2);<br /> if(TIME_ZONE!="") $date=str_replace("+00:00",TIME_ZONE,$date);<br /> return $date;<br /> }<br /><br /> function unix(){<br /> return $this->unix;<br /> }<br />}<br /><br />class RSSCreator10 extends FeedCreator{<br /> function createFeed(){<br /> $feed="<?xml version=\"1.0\" encoding=\"".$this->encoding."\"?>\n";<br /> $feed.= $this->_createGeneratorComment();<br /> if($this->cssStyleSheet==""){<br /> $cssStyleSheet="http://www.w3.org/2000/08/w3c-synd/style.css";<br /> }<br /> $feed.= $this->_createStylesheetReferences();<br /> $feed.= "<rdf:RDF\n";<br /> $feed.= " xmlns=\"http://purl.org/rss/1.0/\"\n";<br /> $feed.= " xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\"\n";<br /> $feed.= " xmlns:slash=\"http://purl.org/rss/1.0/modules/slash/\"\n";<br /> $feed.= " xmlns:dc=\"http://purl.org/dc/elements/1.1/\">\n";<br /> $feed.= " <channel rdf:about=\"".$this->syndicationURL."\">\n";<br /> $feed.= " <title>".htmlspecialchars($this->title)."</title>\n";<br /> $feed.= " <description>".htmlspecialchars($this->description)."</description>\n";<br /> $feed.= " <link>".$this->link."</link>\n";<br /> if($this->image!=null){<br /> $feed.= " <image rdf:resource=\"".$this->image->url."\" />\n";<br /> }<br /> $now=new FeedDate();<br /> $feed.= " <dc:date>".htmlspecialchars($now->iso8601())."</dc:date>\n";<br /> $feed.= " <items>\n";<br /> $feed.= " <rdf:Seq>\n";<br /> for ($i=0;$i<count($this->items);$i++){<br /> $feed.= " <rdf:li rdf:resource=\"".htmlspecialchars($this->items[$i]->link)."\"/>\n";<br /> }<br /> $feed.= " </rdf:Seq>\n";<br /> $feed.= " </items>\n";<br /> $feed.= " </channel>\n";<br /> if($this->image!=null){<br /> $feed.= " <image rdf:about=\"".$this->image->url."\">\n";<br /> $feed.= " <title>".$this->image->title."</title>\n";<br /> $feed.= " <link>".$this->image->link."</link>\n";<br /> $feed.= " <url>".$this->image->url."</url>\n";<br /> $feed.= " </image>\n";<br /> }<br /> $feed.= $this->_createAdditionalElements($this->additionalElements," ");<br /><br /> for ($i=0;$i<count($this->items);$i++){<br /> $feed.= " <item rdf:about=\"".htmlspecialchars($this->items[$i]->link)."\">\n";<br /> //$feed.= " <dc:type>Posting</dc:type>\n";<br /> $feed.= " <dc:format>text/html</dc:format>\n";<br /> if($this->items[$i]->date!=null){<br /> $itemDate=new FeedDate($this->items[$i]->date);<br /> $feed.= " <dc:date>".htmlspecialchars($itemDate->iso8601())."</dc:date>\n";<br /> }<br /> if($this->items[$i]->source!=""){<br /> $feed.= " <dc:source>".htmlspecialchars($this->items[$i]->source)."</dc:source>\n";<br /> }<br /> if($this->items[$i]->author!=""){<br /> $feed.= " <dc:creator>".htmlspecialchars($this->items[$i]->author)."</dc:creator>\n";<br /> }<br /> $feed.= " <title>".htmlspecialchars(strip_tags(strtr($this->items[$i]->title,"\n\r"," ")))."</title>\n";<br /> $feed.= " <link>".htmlspecialchars($this->items[$i]->link)."</link>\n";<br /> $feed.= " <description>".htmlspecialchars($this->items[$i]->description)."</description>\n";<br /> $feed.= $this->_createAdditionalElements($this->items[$i]->additionalElements," ");<br /> $feed.= " </item>\n";<br /> }<br /> $feed.= "</rdf:RDF>\n";<br /> return $feed;<br /> }<br />}<br /><br />class RSSCreator091 extends FeedCreator{<br /> var $RSSVersion;<br /><br /> function RSSCreator091(){<br /> $this->_setRSSVersion("0.91");<br /> $this->contentType="application/rss+xml";<br /> }<br /><br /> function _setRSSVersion($version){<br /> $this->RSSVersion=$version;<br /> }<br /><br /> function createFeed(){<br /> $feed="<?xml version=\"1.0\" encoding=\"".$this->encoding."\"?>\n";<br /> $feed.= $this->_createGeneratorComment();<br /> $feed.= $this->_createStylesheetReferences();<br /> $feed.= "<rss version=\"".$this->RSSVersion."\">\n";<br /> $feed.= " <channel>\n";<br /> $feed.= " <title>".FeedCreator::iTrunc(htmlspecialchars($this->title),100)."</title>\n";<br /> $this->descriptionTruncSize=500;<br /> $feed.= " <description>".$this->getDescription()."</description>\n";<br /> $feed.= " <link>".$this->link."</link>\n";<br /> $now=new FeedDate();<br /> $feed.= " <lastBuildDate>".htmlspecialchars($now->rfc822())."</lastBuildDate>\n";<br /> $feed.= " <generator>".FEEDCREATOR_VERSION."</generator>\n";<br /><br /> if($this->image!=null){<br /> $feed.= " <image>\n";<br /> $feed.= " <url>".$this->image->url."</url>\n";<br /> $feed.= " <title>".FeedCreator::iTrunc(htmlspecialchars($this->image->title),100)."</title>\n";<br /> $feed.= " <link>".$this->image->link."</link>\n";<br /> if($this->image->width!=""){<br /> $feed.= " <width>".$this->image->width."</width>\n";<br /> }<br /> if($this->image->height!=""){<br /> $feed.= " <height>".$this->image->height."</height>\n";<br /> }<br /> if($this->image->description!=""){<br /> $feed.= " <description>".$this->image->getDescription()."</description>\n";<br /> }<br /> $feed.= " </image>\n";<br /> }<br /> if($this->language!=""){<br /> $feed.= " <language>".$this->language."</language>\n";<br /> }<br /> if($this->copyright!=""){<br /> $feed.= " <copyright>".FeedCreator::iTrunc(htmlspecialchars($this->copyright),100)."</copyright>\n";<br /> }<br /> if($this->editor!=""){<br /> $feed.= " <managingEditor>".FeedCreator::iTrunc(htmlspecialchars($this->editor),100)."</managingEditor>\n";<br /> }<br /> if($this->webmaster!=""){<br /> $feed.= " <webMaster>".FeedCreator::iTrunc(htmlspecialchars($this->webmaster),100)."</webMaster>\n";<br /> }<br /> if($this->pubDate!=""){<br /> $pubDate=new FeedDate($this->pubDate);<br /> $feed.= " <pubDate>".htmlspecialchars($pubDate->rfc822())."</pubDate>\n";<br /> }<br /> if($this->category!=""){<br /> $feed.= " <category>".htmlspecialchars($this->category)."</category>\n";<br /> }<br /> if($this->docs!=""){<br /> $feed.= " <docs>".FeedCreator::iTrunc(htmlspecialchars($this->docs),500)."</docs>\n";<br /> }<br /> if($this->ttl!=""){<br /> $feed.= " <ttl>".htmlspecialchars($this->ttl)."</ttl>\n";<br /> }<br /> if($this->rating!=""){<br /> $feed.= " <rating>".FeedCreator::iTrunc(htmlspecialchars($this->rating),500)."</rating>\n";<br /> }<br /> if($this->skipHours!=""){<br /> $feed.= " <skipHours>".htmlspecialchars($this->skipHours)."</skipHours>\n";<br /> }<br /> if($this->skipDays!=""){<br /> $feed.= " <skipDays>".htmlspecialchars($this->skipDays)."</skipDays>\n";<br /> }<br /> $feed.= $this->_createAdditionalElements($this->additionalElements," ");<br /><br /> for ($i=0;$i<count($this->items);$i++){<br /> $feed.= " <item>\n";<br /> $feed.= " <title>".FeedCreator::iTrunc(htmlspecialchars(strip_tags($this->items[$i]->title)),100)."</title>\n";<br /> $feed.= " <link>".htmlspecialchars($this->items[$i]->link)."</link>\n";<br /> $feed.= " <description>".$this->items[$i]->getDescription()."</description>\n";<br /><br /> if($this->items[$i]->author!=""){<br /> $feed.= " <author>".htmlspecialchars($this->items[$i]->author)."</author>\n";<br /> }<br /> /*<br /> // on hold<br /> if($this->items[$i]->source!=""){<br /> $feed.= " <source>".htmlspecialchars($this->items[$i]->source)."</source>\n";<br /> }<br /> */<br /> if($this->items[$i]->category!=""){<br /> $feed.= " <category>".htmlspecialchars($this->items[$i]->category)."</category>\n";<br /> }<br /> if($this->items[$i]->comments!=""){<br /> $feed.= " <comments>".htmlspecialchars($this->items[$i]->comments)."</comments>\n";<br /> }<br /> if($this->items[$i]->date!=""){<br /> $itemDate=new FeedDate($this->items[$i]->date);<br /> $feed.= " <pubDate>".htmlspecialchars($itemDate->rfc822())."</pubDate>\n";<br /> }<br /> if($this->items[$i]->guid!=""){<br /> $feed.= " <guid>".htmlspecialchars($this->items[$i]->guid)."</guid>\n";<br /> }<br /> $feed.= $this->_createAdditionalElements($this->items[$i]->additionalElements," ");<br /> $feed.= " </item>\n";<br /> }<br /> $feed.= " </channel>\n";<br /> $feed.= "</rss>\n";<br /> return $feed;<br /> }<br />}<br /><br />class RSSCreator20 extends RSSCreator091{<br /><br /> function RSSCreator20(){<br /> parent::_setRSSVersion("2.0");<br /> }<br /><br /><p>}使用示例：
<p><?php</p>header('Content-Type:text/html; charset=utf-8');<br />$db=mysql_connect('127.0.0.1','root','123456');<br />mysql_query("set names utf8");<br />mysql_select_db('dbname',$db);<br />$brs=mysql_query('select * from article order by add_time desc limit 0,10',$db);<br />$rss=new UniversalFeedCreator();<br />$rss->title="页面标题";<br />$rss->link="网址http://";<br />$rss->description="rss标题";<br />while($rowbrs=mysql_fetch_array($brs)){<br /> $item=new FeedItem();<br /> $item->title =$rowbrs['subject'];<br /> $item->link='http://www.scutephp.com/';<br /> $item->description =$rowbrs['description'];<br /> $rss->addItem($item);<br />}<br />mysql_close($db);<br />$rss->saveFeed("RSS2.0","rss.xml");
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