php生成RSS订阅类

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 />			$result="rawFieldContent."]]>";<br />		}else{<br />			if($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 "<!---ecms -ecms  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.= $indentString."$value\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($matches[7],-2)) * 60;<br />			}else{<br />				<p>4本文￥来源gao!%daima.com搞$代*!码$网9</p><pre>搞代gaodaima码

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&#8221;;
}
$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.= ” syndicationURL.”\”>\n”;
$feed.= ” \n”;
$feed.= ” “.htmlspecialchars($this->description).”\n”;
$feed.= ” <link>”.$this->link.”\n”;
if($this->image!=null){
$feed.= ” image->url.”\” />\n”;
}
$now=new FeedDate();
$feed.= ” “.htmlspecialchars($now->iso8601()).”\n”;
$feed.= ” \n”;
$feed.= ” \n”;
for ($i=0;$iitems);$i++){
$feed.= ” items[$i]->link).”\”/>\n”;
}
$feed.= ” \n”;
$feed.= ” \n”;
$feed.= ” \n”;
if($this->image!=null){
$feed.= ” image->url.”\”>\n”;
$feed.= ” \n”;
$feed.= ” <link>”.$this->image->link.”\n”;
$feed.= ” “.$this->image->url.”\n”;
$feed.= ” \n”;
}
$feed.= $this->_createAdditionalElements($this->additionalElements,” “);

for ($i=0;$iitems);$i++){
$feed.= ” items[$i]->link).”\”>\n”;
//$feed.= ” Posting\n”;
$feed.= ” text/html\n”;
if($this->items[$i]->date!=null){
$itemDate=new FeedDate($this->items[$i]->date);
$feed.= ” “.htmlspecialchars($itemDate->iso8601()).”\n”;
}
if($this->items[$i]->source!=””){
$feed.= ” “.htmlspecialchars($this->items[$i]->source).”\n”;
}
if($this->items[$i]->author!=””){
$feed.= ” “.htmlspecialchars($this->items[$i]->author).”\n”;
}
$feed.= ” \n”;
$feed.= ” <link>”.htmlspecialchars($this->items[$i]->link).”\n”;
$feed.= ” “.htmlspecialchars($this->items[$i]->description).”\n”;
$feed.= $this->_createAdditionalElements($this->items[$i]->additionalElements,” “);
$feed.= ” \n”;
}
$feed.= “\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.= “RSSVersion.”\”>\n”;
$feed.= ” \n”;
$feed.= ” \n”;
$this->descriptionTruncSize=500;
$feed.= ” “.$this->getDescription().”\n”;
$feed.= ” <link>”.$this->link.”\n”;
$now=new FeedDate();
$feed.= ” “.htmlspecialchars($now->rfc822()).”\n”;
$feed.= ” “.FEEDCREATOR_VERSION.”\n”;

if($this->image!=null){
$feed.= ” \n”;
$feed.= ” “.$this->image->url.”\n”;
$feed.= ” \n”;
$feed.= ” <link>”.$this->image->link.”\n”;
if($this->image->width!=””){
$feed.= ” “.$this->image->width.”\n”;
}
if($this->image->height!=””){
$feed.= ” “.$this->image->height.”\n”;
}
if($this->image->description!=””){
$feed.= ” “.$this->image->getDescription().”\n”;
}
$feed.= ” \n”;
}
if($this->language!=””){
$feed.= ” “.$this->language.”\n”;
}
if($this->copyright!=””){
$feed.= ” “.FeedCreator::iTrunc(htmlspecialchars($this->copyright),100).”\n”;
}
if($this->editor!=””){
$feed.= ” “.FeedCreator::iTrunc(htmlspecialchars($this->editor),100).”\n”;
}
if($this->webmaster!=””){
$feed.= ” “.FeedCreator::iTrunc(htmlspecialchars($this->webmaster),100).”\n”;
}
if($this->pubDate!=””){
$pubDate=new FeedDate($this->pubDate);
$feed.= ” “.htmlspecialchars($pubDate->rfc822()).”\n”;
}
if($this->category!=””){
$feed.= ” “.htmlspecialchars($this->category).”\n”;
}
if($this->docs!=””){
$feed.= ” “.FeedCreator::iTrunc(htmlspecialchars($this->docs),500).”\n”;
}
if($this->ttl!=””){
$feed.= ” “.htmlspecialchars($this->ttl).”\n”;
}
if($this->rating!=””){
$feed.= ” “.FeedCreator::iTrunc(htmlspecialchars($this->rating),500).”\n”;
}
if($this->skipHours!=””){
$feed.= ” “.htmlspecialchars($this->skipHours).”\n”;
}
if($this->skipDays!=””){
$feed.= ” “.htmlspecialchars($this->skipDays).”\n”;
}
$feed.= $this->_createAdditionalElements($this->additionalElements,” “);

for ($i=0;$iitems);$i++){
$feed.= ” \n”;
$feed.= ” \n”;
$feed.= ” <link>”.htmlspecialchars($this->items[$i]->link).”\n”;
$feed.= ” “.$this->items[$i]->getDescription().”\n”;

if($this->items[$i]->author!=””){
$feed.= ” “.htmlspecialchars($this->items[$i]->author).”\n”;
}
/*
// on hold
if($this->items[$i]->source!=””){
$feed.= ” “.htmlspecialchars($this->items[$i]->source).”\n”;
}
*/
if($this->items[$i]->category!=””){
$feed.= ” “.htmlspecialchars($this->items[$i]->category).”\n”;
}
if($this->items[$i]->comments!=””){
$feed.= ” “.htmlspecialchars($this->items[$i]->comments).”\n”;
}
if($this->items[$i]->date!=””){
$itemDate=new FeedDate($this->items[$i]->date);
$feed.= ” “.htmlspecialchars($itemDate->rfc822()).”\n”;
}
if($this->items[$i]->guid!=””){
$feed.= ” “.htmlspecialchars($this->items[$i]->guid).”\n”;
}
$feed.= $this->_createAdditionalElements($this->items[$i]->additionalElements,” “);
$feed.= ” \n”;
}
$feed.= ” \n”;
$feed.= “\n”;
return $feed;
}
}

class RSSCreator20 extends RSSCreator091{

function RSSCreator20(){
parent::_setRSSVersion(“2.0”);
}

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