PHP生成RSS订阅的程序代码-PHP源码-PHP中文网

生成RSS非常的简单只需要使用rss格式然后生成输出到浏览器就可以了，重点就是要告诉浏览器你是rss格式的数据即可，具体来看个例子。

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

<?xml version="1.0" encoding="utf-8"?>
<rss version="2.0">
<channel>
<title>网站名称</title>
<link>http://www.111cn.net/</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>

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RSS实例

<?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
$data = array(
'id' => 1,
'date' => date('r', time()),
'title' => '文章标题',
'link' => 'http://www.111cn.net',    //文章地址
'description' => '网站描述'
);
for($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;
?>

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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：

设置 title 为 Feed 标题，href 为 Feed 地址，一切就 OK 了！

例子2

<?xml version="1.0" encoding="utf-8"?>

<rss version="2.0">

<channel>

<title>php程序员教程网</title>

<link>http://www.111cn.net/</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>

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下面分享一段使用 php 动态生成 RSS 的代码示例：

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<?php
/**
** php 动态生成 RSS 类
**/
define("TIME_ZONE","");
define("FEEDCREATOR_VERSION","www.111cn.net");//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);
  foreach ($vars as $key => $value){
   // prevent overwriting of properties "contentType","encoding"; do not copy "_feed" itself
   if(!in_array($key, array("_feed","contentType","encoding"))){
    $this->_feed->{$key}=$this->{$key};
   }
  }
 }
 function createFeed($format="RSS0.91"){
  $this->_setFormat($format);
  return $this->_feed->createFeed();
 }
 function saveFeed($format="RSS0.91",$filename="",$displayContents=true){
  $this->_setFormat($format);
  $this->_feed->saveFeed($filename,$displayContents);
 }
 function useCached($format="RSS0.91",$filename="",$timeout=3600){
  $this->_setFormat($format);
  $this->_feed->useCached($filename,$timeout);
 }
}
class FeedCreator extends HtmlDescribable{
 var $title,$description,$link;
 var $syndicationURL,$image,$language,$copyright,$pubDate,$lastBuildDate,$editor,$editorEmail,$webmaster,$category,$docs,$ttl,$rating,$skipHours,$skipDays;
 var $xslStyleSheet="";
 var $items=Array();
 var $contentType="application/xml";
 var $encoding="utf-8";
 var $additionalElements=Array();
 function addItem($item){
  $this->items[]=$item;
 }
 function clearItem2Null(){
  $this->items=array();
 }
 function iTrunc($string,$length){
  if(strlen($string)<=$length){
   return $string;
  }
  $pos=strrpos($string,".");
  if($pos>=$length-4){
   $string=substr($string,0,$length-4);
   $pos=strrpos($string,".");
  }
  if($pos>=$length*0.4){
   return substr($string,0,$pos+1)." ...";
  }
  $pos=strrpos($string," ");
  if($pos>=$length-4){
   $string=substr($string,0,$length-4);
   $pos=strrpos($string," ");
  }
  if($pos>=$length*0.4){
   return substr($string,0,$pos)." ...";
  }
  return substr($string,0,$length-4)." ...";
 }

 function _createGeneratorComment(){
  return "<!-- generator="".FEEDCREATOR_VERSION."" -->
";
 }
 function _createAdditionalElements($elements,$indentString=""){
  $ae="";
  if(is_array($elements)){
   foreach($elements AS $key => $value){
    $ae.= $indentString."<$key>$value</$key>
";
   }
  }
  return $ae;
 }
 function _createStylesheetReferences(){
  $xml="";
  if($this->cssStyleSheet) $xml .= "<?xml-stylesheet href="".$this->cssStyleSheet."" type="text/css"?>
";
  if($this->xslStyleSheet) $xml .= "<?xml-stylesheet href="".$this->xslStyleSheet."" type="text/xsl"?>
";
  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.""?>
";
  $feed.= $this->_createGeneratorComment();
  if($this->cssStyleSheet==""){
   $cssStyleSheet="http://www.w3.org/2000/08/w3c-synd/style.css";
  }
  $feed.= $this->_createStylesheetReferences();
  $feed.= "<rdf:RDF
";
  $feed.= "    xmlns="http://purl.org/rss/1.0/"
";
  $feed.= "    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
";
  $feed.= "    xmlns:slash="http://purl.org/rss/1.0/modules/slash/"
";
  $feed.= "    xmlns:dc="http://purl.org/dc/elements/1.1/">
";
  $feed.= "    <channel rdf:about="".$this->syndicationURL."">
";
  $feed.= "        <title>".htmlspecialchars($this->title)."</title>
";
  $feed.= "        <description>".htmlspecialchars($this->description)."</description>
";
  $feed.= "        <link>".$this->link."</link>
";
  if($this->image!=null){
   $feed.= "        <image rdf:resource="".$this->image->url."" />
";
  }
  $now=new FeedDate();
  $feed.= "       <dc:date>".htmlspecialchars($now->iso8601())."</dc:date>
";
  $feed.= "        <items>
";
  $feed.= "            <rdf:Seq>
";
  for ($i=0;$i<count($this->items);$i++){
   $feed.= "                <rdf:li rdf:resource="".htmlspecialchars($this->items[$i]->link).""/>
";
  }
  $feed.= "            </rdf:Seq>
";
  $feed.= "        </items>
";
  $feed.= "    </channel>
";
  if($this->image!=null){
   $feed.= "    <image rdf:about="".$this->image->url."">
";
   $feed.= "        <title>".$this->image->title."</title>
";
   $feed.= "        <link>".$this->image->link."</link>
";
   $feed.= "        <url>".$this->image->url."</url>
";
   $feed.= "    </image>
";
  }
  $feed.= $this->_createAdditionalElements($this->additionalElements,"    ");
  for ($i=0;$i<count($this->items);$i++){
   $feed.= "    <item rdf:about="".htmlspecialchars($this->items[$i]->link)."">
";
   //$feed.= "        <dc:type>Posting</dc:type>
";
   $feed.= "        <dc:format>text/html</dc:format>
";
   if($this->items[$i]->date!=null){
    $itemDate=new FeedDate($this->items[$i]->date);
    $feed.= "        <dc:date>".htmlspecialchars($itemDate->iso8601())."</dc:date>
";
   }
   if($this->items[$i]->source!=""){
    $feed.= "        <dc:source>".htmlspecialchars($this->items[$i]->source)."</dc:source>
";
   }
   if($this->items[$i]->author!=""){
    $feed.= "        <dc:creator>".htmlspecialchars($this->items[$i]->author)."</dc:creator>
";
   }
   $feed.= "        <title>".htmlspecialchars(strip_tags(strtr($this->items[$i]->title,"

","  ")))."</title>
";
   $feed.= "        <link>".htmlspecialchars($this->items[$i]->link)."</link>
";
   $feed.= "        <description>".htmlspecialchars($this->items[$i]->description)."</description>
";
   $feed.= $this->_createAdditionalElements($this->items[$i]->additionalElements,"        ");
   $feed.= "    </item>
";
  }
  $feed.= "</rdf:RDF>
";
  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.""?>
";
  $feed.= $this->_createGeneratorComment();
  $feed.= $this->_createStylesheetReferences();
  $feed.= "<rss version="".$this->RSSVersion."">
";
  $feed.= "    <channel>
";
  $feed.= "        <title>".FeedCreator::iTrunc(htmlspecialchars($this->title),100)."</title>
";
  $this->descriptionTruncSize=500;
  $feed.= "        <description>".$this->getDescription()."</description>
";
  $feed.= "        <link>".$this->link."</link>
";
  $now=new FeedDate();
  $feed.= "        <lastBuildDate>".htmlspecialchars($now->rfc822())."</lastBuildDate>
";
  $feed.= "        <generator>".FEEDCREATOR_VERSION."</generator>
";
  if($this->image!=null){
   $feed.= "        <image>
";
   $feed.= "            <url>".$this->image->url."</url>
";
   $feed.= "            <title>".FeedCreator::iTrunc(htmlspecialchars($this->image->title),100)."</title>
";
   $feed.= "            <link>".$this->image->link."</link>
";
   if($this->image->width!=""){
    $feed.= "            <width>".$this->image->width."</width>
";
   }
   if($this->image->height!=""){
    $feed.= "            <height>".$this->image->height."</height>
";
   }
   if($this->image->description!=""){
    $feed.= "            <description>".$this->image->getDescription()."</description>
";
   }
   $feed.= "        </image>
";
  }
  if($this->language!=""){
   $feed.= "        <language>".$this->language."</language>
";
  }
  if($this->copyright!=""){
   $feed.= "        <copyright>".FeedCreator::iTrunc(htmlspecialchars($this->copyright),100)."</copyright>
";
  }
  if($this->editor!=""){
   $feed.= "        <managingEditor>".FeedCreator::iTrunc(htmlspecialchars($this->editor),100)."</managingEditor>
";
  }
  if($this->webmaster!=""){
   $feed.= "        <webMaster>".FeedCreator::iTrunc(htmlspecialchars($this->webmaster),100)."</webMaster>
";
  }
  if($this->pubDate!=""){
   $pubDate=new FeedDate($this->pubDate);
   $feed.= "        <pubDate>".htmlspecialchars($pubDate->rfc822())."</pubDate>
";
  }
  if($this->category!=""){
   $feed.= "        <category>".htmlspecialchars($this->category)."</category>
";
  }
  if($this->docs!=""){
   $feed.= "        <docs>".FeedCreator::iTrunc(htmlspecialchars($this->docs),500)."</docs>
";
  }
  if($this->ttl!=""){
   $feed.= "        <ttl>".htmlspecialchars($this->ttl)."</ttl>
";
  }
  if($this->rating!=""){
   $feed.= "        <rating>".FeedCreator::iTrunc(htmlspecialchars($this->rating),500)."</rating>
";
  }
  if($this->skipHours!=""){
   $feed.= "        <skipHours>".htmlspecialchars($this->skipHours)."</skipHours>
";
  }
  if($this->skipDays!=""){
   $feed.= "        <skipDays>".htmlspecialchars($this->skipDays)."</skipDays>
";
  }
  $feed.= $this->_createAdditionalElements($this->additionalElements,"    ");
  for ($i=0;$i<count($this->items);$i++){
   $feed.= "        <item>
";
   $feed.= "            <title>".FeedCreator::iTrunc(htmlspecialchars(strip_tags($this->items[$i]->title)),100)."</title>
";
   $feed.= "            <link>".htmlspecialchars($this->items[$i]->link)."</link>
";
   $feed.= "            <description>".$this->items[$i]->getDescription()."</description>
";
   if($this->items[$i]->author!=""){
    $feed.= "            <author>".htmlspecialchars($this->items[$i]->author)."</author>
";
   }
   /*
    // on hold
    if($this->items[$i]->source!=""){
    $feed.= "            <source>".htmlspecialchars($this->items[$i]->source)."</source>
";
    }
    */
   if($this->items[$i]->category!=""){
    $feed.= "            <category>".htmlspecialchars($this->items[$i]->category)."</category>
";
   }
   if($this->items[$i]->comments!=""){
    $feed.= "            <comments>".htmlspecialchars($this->items[$i]->comments)."</comments>
";
   }
   if($this->items[$i]->date!=""){
    $itemDate=new FeedDate($this->items[$i]->date);
    $feed.= "            <pubDate>".htmlspecialchars($itemDate->rfc822())."</pubDate>
";
   }
   if($this->items[$i]->guid!=""){
    $feed.= "            <guid>".htmlspecialchars($this->items[$i]->guid)."</guid>
";
   }
   $feed.= $this->_createAdditionalElements($this->items[$i]->additionalElements,"        ");
   $feed.= "        </item>
";
  }
  $feed.= "    </channel>
";
  $feed.= "</rss>
";
  return $feed;
 }
}
class RSSCreator20 extends RSSCreator091{
 function RSSCreator20(){
  parent::_setRSSVersion("2.0");
 }
}

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使用示例：

<?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.111cn.net/';
 $item->description =$rowbrs['description'];
 $rss->addItem($item);
}
mysql_close($db);
$rss->saveFeed("RSS2.0","rss.xml");

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