php生成rss订阅的方法，phprss订阅本文实例讲述了php生成rss订阅的方法。分享给大家供大家参考。具体分析如下：
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。rss可以是以下三个解释的其中一个： really simple syndication；rdf (resource description framework) site summary； rich site summary。但其实这三个解释都是指同一种syndication的技术。rss目前广泛用于网上新闻频道，blog和wiki。使用rss订阅能更快地获取信息，网站提供rss输出，有利于让用户获取网站内容的最新更新。网络用户可以在客户端借助于支持rss的聚合工具软件，在不打开网站内容页面的情况下阅读支持rss输出的网站内容。
从技术上来说一个rss文件就是一段规范的xml数据，该文件一般以rss，xml或者rdf作为后缀，下面是一段 rss 文件的内容示例：
复制代码 代码如下:
帮客之家
http://www.bkjia.com/
帮客之家
rss tutorial
网站地址/rss
new rss tutorial on w3school
xml tutorial
网站地址/xml
new xml tutorial on w3school
下面分享一段使用 php 动态生成 rss 的代码示例：
复制代码 代码如下:
/**
** php 动态生成 rss 类
**/
define(time_zone,);
define(feedcreator_version,www.jb51.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){
$result=rawfieldcontent.]]>;
}else{
if($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) 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 \n;
}
function _createadditionalelements($elements,$indentstring=){
$ae=;
if(is_array($elements)){
foreach($elements as $key => $value){
$ae.= $indentstring.$value$key>\n;
}
}
return $ae;
}
function _createstylesheetreferences(){
$xml=;
if($this->cssstylesheet) $xml .= cssstylesheet.\ type=\text/css\?>\n;
if($this->xslstylesheet) $xml .= 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) $this->_redirect($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
error creating feed file, please check write permissions.
;
}
}
}
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 $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=encoding.\?>\n;
$feed.= $this->_creategeneratorcomment();
if($this->cssstylesheet==){
$cssstylesheet=http://www.w3.org/2000/08/w3c-synd/style.css;
}
$feed.= $this->_createstylesheetreferences();
$feed.= $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;
$feed.= .htmlspecialchars($this->title).\n;
$feed.= .htmlspecialchars($this->description).\n;
$feed.= .$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;
$feed.= .$this->image->title.\n;
$feed.= .$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;
}
$feed.= .htmlspecialchars(strip_tags(strtr($this->items[$i]->title,\n\r, ))).\n;
$feed.= .htmlspecialchars($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=encoding.\?>\n;
$feed.= $this->_creategeneratorcomment();
$feed.= $this->_createstylesheetreferences();
$feed.= rssversion.\>\n;
$feed.= \n;
$feed.= .feedcreator::itrunc(htmlspecialchars($this->title),100).\n;
$this->descriptiontruncsize=500;
$feed.= .$this->getdescription().\n;
$feed.= .$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;
$feed.= .feedcreator::itrunc(htmlspecialchars($this->image->title),100).\n;
$feed.= .$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;
$feed.= .feedcreator::itrunc(htmlspecialchars(strip_tags($this->items[$i]->title)),100).\n;
$feed.= .htmlspecialchars($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);
}
}
使用示例：
复制代码 代码如下:
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.bkjia.com/';
$item->description =$rowbrs['description'];
$rss->additem($item);
}
mysql_close($db);
$rss->savefeed(rss2.0,rss.xml);
希望本文所述对大家的php程序设计有所帮助。
http://www.bkjia.com/phpjc/958257.htmlwww.bkjia.comtruehttp://www.bkjia.com/phpjc/958257.htmltecharticlephp生成rss订阅的方法，phprss订阅 本文实例讲述了php生成rss订阅的方法。分享给大家供大家参考。具体分析如下： rss（简易信息聚合，也叫...