PHP generates RSS subscriptions for program code

RSS, also called aggregated content, is a format for describing and synchronizing web site content. The following code to generate an RSS subscription:
RSS XML Structure

<?xml version= "1.0" encoding= "Utf-8"?> <rss version=
"2.0" >
<channel>
<title> Website name </title>
<link>http://www.111cn.net/</link>
<description> website Description!</ description>
<item>
<title>rss tutorial</title>
<link> website address/rss</link >
<description>new RSS tutorial on w3school</description>
</item>
<item>
<title>xml tutorial</title>
<link> website address/xml</link>
<description> New XML tutorial on w3school</description>
</item>
</channel>
</rss>

RSS instances

<?php class rss {public function createfeed ()  {//rss head $webUrl  =  ' http://' $_server[' Http_host '];//website address $webName  =  ' website name ';     //website name $webDesc  =  '
Description of the Web site $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 can be replaced with their own data $html  =  ';//Article Data $data  = array (' id '  => 1, ' Date '  => date (' R ',  time ()), ' title '  =>   ' article title ', ' Link '  =>  ' http://www.111cn.net ',     //article address ' description '  =
>  ' website description '); For ($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;?>

After the RSS feed is generated, how to set up to add RSS to the website? and have Firefox, IE7, or other Feed bots automatically discovered? Simply add a specific Link tag to the head section of the page, as follows:
<link rel= "Alternate" type= "Application/rss+xml" title= "website name RSS feed" href= "http://www.111cn.net"/>
Set title as feed title, href as feed address, everything OK!

Example 2

<?xml version= "1.0" encoding= "Utf-8"?> <rss version=

"2.0" >

<channel>

<title> PHP Programmer Tutorial Network </title>

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

<description> This site is a PHP programmer working Life notes!</description>

<item>

<title>rss tutorial</title>

< link> Web address/rss</link>

<description>new RSS tutorial on w3school</description>

</ item>

<item>

<title>xml tutorial</title>

<link> website address/xml</link>

<description>new XML tutorial on w3school</description>

</item>

</channel>

</rss>

Share the following code example for dynamically generating RSS using PHP:

<?php/** ** php  Dynamic Generation  RSS  class **/define ("Time_zone", "");
Define ("Feedcreator_version", "www.111cn.net");//Your website 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 (); &NBSP}} class feedhtmlfield{&NBsp;var  $rawFieldContent;
 var  $truncSize, $syndicateHtml;  function feedhtmlfield ($parFieldContent) {  if ($parFieldContent) {    $this-
>rawfieldcontent= $parFieldContent;  &NBSP} &nbsp}  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; &NBSP}} class universalfeedcreator extends feedcreator{ var $_feed;  function& nbsp; _setformat ($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;
 &NBSP}    $vars =get_object_vars ($this);   foreach  ($vars  as  $key  =>  $value) {   // prevent  overwriting of properties  "ContentType", "Encoding"; do not copy  "_ Feed " itself    if (!in_array ($key,  array (" _feed "," ContentType "," Encodi ")Ng ")) {     $this->_feed->{$key}= $this->{$key};    }   } &NBSP}  function createfeed ($format = "RSS0.91") {   $this->_setformat ($format);  
 return  $this->_feed->createfeed (); &NBSP}  function savefeed ($format = "RSS0.91", $filename = "", $displayContents =true) {   $this-
>_setformat ($format);
   $this->_feed->savefeed ($filename, $displayContents); &NBSP}  function usecached ($format = "RSS0.91", $filename = "", $timeout =3600) {   $this->_
SetFormat ($format);
   $this->_feed->usecached ($filename, $timeout);
&NBSP} 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; &nbsp}  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 ($string, ".");  &NBSP}   if ($pos >= $length *0.4) {   return substr ($string, 0, $pos + 1). "
  ... ";
 &NBSP}    $pos =strrpos ($string, " ");   if ($pos >= $length-4) {    $string =substr ($string, 0, $length-4);    $
Pos=strrpos ($string, " ");  &NBSP}   if ($pos >= $length *0.4) {  &NBsp;return substr ($string, 0, $pos). "
  ... ";  &NBSP}   return substr ($string, 0, $length-4). "
  ... "; &NBSP}  function _creategeneratorcomment () {  return  <!-- generator=\ "". Feedcreator_version. "
\ " -->\n"; &NBSP}  function _createadditionalelements ($elements, $indentString = "") {   $ae = "";  
 if (Is_array ($elements)) {   foreach ($elements  AS  $key  =>  $value) {      $ae .=  $indentString. "
< $key > $value </$key >\n ";
      }   return  $ae; &NBSP}  function _createstylesheetreferences () {   $xml = "";   if ($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; &NBSP}  function createfeed () {}  function _generatefilename () {   $fileInfo =
PathInfo ($_server["php_self"]);   return substr ($fileInfo ["basename"],0,-(strlen ($fileInfo ["extension"]) +1). ".
XML "; &NBSP}  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 ();
&NBSP}  function usecached ($filename = "", $timeout =3600) {   $this->_timeout= $timeout;   if ($filename = = "") {    $filename = $this->_generatefilename ();   }  
 if (file_exists ($filename)  &&  (Time ()-filemtime ($filename)  <  $timeout)) {     $this->_redirect ($filename);  &NBSP} &nbsp}  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);    &NBSP}   }else{   echo  "<br /><b>error creating feed
 file, please check write permissions.</b><br /> ";
 &NBSP} &nbsp} class feeddate{ var  $unix;  function feeddate ($dateString = "") {
  if ($dateString = = "")   $dateString =date ("R");
  if (Is_integer ($dateString)) {    $this->unix= $dateString;    return;   } &Nbsp; 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 ("The =>1", "Feb" =>2, "Mar" =>3, "APR" =>4, "may" =>5, "June" =>6, "" "=>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")  -&nbSP; $ord  - 1)  *  $oneHour;      } elseif ($ord  >= ord ("M")  &&  $matches [7]!=] Z
") {       $tzOffset = ($ord  - ord (" M "))  *  $oneHour;
     } elseif ($matches [7]== "Z") {       $tzOffset = 0;
    &NBSP}    &nbsp}     switch  ($matches [7]) {      case  "UT":      case  "GMT":   
  $tzOffset = 0;
   &NBSP}   &nbsp     $this->unix +=  $tzOffset;
   return;  &NBSP}   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
;
   &NBSP}   &nbsp     $this->unix +=  $tzOffset;
   return;
 &NBSP}    $this->unix=0; &NBSP}  function rfc822 () {   $date =gmdate ("Y-m-d h:i:s", $this->unix);   if
(time_zone!= "")   $date  .=  " " Str_replace (":", "", Time_zone);
  return  $date; &NBSP}  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; &nbsp}} 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 ";
 &NBSP}    $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";
 &NBSP}    $now =new feeddate ();    $feed .=  "       <dc:date>" Htmlspecialchars ($now- >iso8601 ()). "
</dc:date>\n ";    $feed .=  "       &Nbsp;<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";  &NBSP}    $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";  &NBSP}    $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 ";   &NBSP}    if ($this->items[$i]->source!= "") {     $feed. =   "        <dc:source>" Htmlspecialchars ($this->items[$i] ->source). "
</dc:source>\n ";   &NBSP}    if ($this->items[$i]->author!= "") {     $feed. =   "        <dc:creator>" Htmlspecialchars ($this->items[$i ]->author). "
</dc:creator>\n ";   &NBSP}     $feed .=  "        <title > ". Htmlspecialchars (Strip_tags (STRTR ($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";
 &NBSP}    $feed .=  "</rdf:rdf>\n";
  return  $feed; &NBSP} class rsscreator091 extends feedcreator{ var  $RSSVersion  function  RSSCreator091 () {   $this->_setrssversion ("0.91")    $this->contenttype= "application/
Rss+xml "; &NBSP}  function _setrssversion ($version) {   $this->rssversion= $version; &NBSP}  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 ();    $feed .=  "  &nbsP;     <lastbuilddate> ". Htmlspecialchars ($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>". $this-> Image->width. "
</width>\n ";   &NBSP}    if ($this->image->height!= "") {     $feed .=              <height> ". $this->image-> Height. "
</height>\n ";   &NBSP}    if ($this->image->description!= "") {     $feed. =   "            <description>" $this-> Image->getdescription (). "
</description>\n ";   &NBSP}     $feed .=  "        </image
>\n ";  &NBSP}   if ($this->language!= "") {    $feed .=  "         <language> ". $this->language."
</language>\n ";   }   if ($this->copyright!= "") {    $feed .=  "         <copyright> ". Feedcreator::itrunc (Htmlspecialchars ($this->copyright), 100). "
</copyright>\n ";  &NBSP}   if ($this->editor!= "") {    $feed .=  "         <managingEditor> ". Feedcreator::itrunc (Htmlspecialchars ($this->editor), 100). "
</managingeditor>\n ";  &NBSP}   if ($this->webmaster!= "") {    $feed .=  "         <webMaster> ". Feedcreator::itrunc (Htmlspecialchars ($this->webmaster), 100). "
</webmaster>\n ";  &NBSP}   if ($this->pubdate!= "") {    $pubDate =new feeddate ($this->
pubdate);     $feed .=  "        <pubDate>". Htmlspecialchars ($pubDate->rfc822 ()). "
</pubdate>\n ";   } &nBsp; if ($this->category!= "") {    $feed .=  "         <category> ". Htmlspecialchars ($this->category)."
</category>\n ";  &NBSP}   if ($this->docs!= "") {    $feed .=  "         <docs> ". Feedcreator::itrunc (Htmlspecialchars ($this->docs), 500). "
</docs>\n ";  &NBSP}   if ($this->ttl!= "") {    $feed .=  "         <ttl> ". Htmlspecialchars ($this->ttl)."
</ttl>\n ";  &NBSP}   if ($this->rating!= "") {    $feed .=  "         <rating> ". Feedcreator::itrunc (Htmlspecialchars ($this->rating), 500). "
</rating>\n ";  &NBSP}   if ($this->skiphours!= "") {    $feed .=  "         <skipHours> ". HtmlspecIalchars ($this->skiphours). "
</skiphours>\n ";  &NBSP}   if ($this->skipdays!= "") {    $feed .=  "         <skipDays> ". Htmlspecialchars ($this->skipdays)."
</skipdays>\n ";  &NBSP}    $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 .=  "&Nbsp;           <description> ". $this->items[$i ]->getdescription (). "
</description>\n ";    if ($this->items[$i]->author!= "") {     $feed .=  "             <author> ". Htmlspecialchars ($this->items[$ I]->author). "
</author>\n ";   &NBSP}    /*     // on hold     if ( $this->items[$i]->source!= "") {     $feed .=  "             <source> ". Htmlspecialchars ($this->items[$i]->source)."
</source>\n ";
   &NBSP}     */   if ($this->items[$i]->category!= "") {      $feed .=  "             <category> ".Htmlspecialchars ($this->items[$i]->category). "
</category>\n ";   &NBSP}    if ($this->items[$i]->comments!= "") {     $feed. =   "            <comments>". Htmlspecialchars ($this->items[$i]->comments). "
</comments>\n ";   &NBSP}    if ($this->items[$i]->date!= "") {     $itemDate =
New feeddate ($this->items[$i]->date);      $feed .=  "             <pubDate> ". Htmlspecialchars ($itemDate->rfc822 ())."
</pubdate>\n ";   &NBSP}    if ($this->items[$i]->guid!= "") {     $feed. =   "            <guid>". Htmlspecialchars ( $this->items[$i]->guid). "
</guid>\n ";    }     $feed .=  $this->_createadditionalelements ($this->items[$i]->additionalelements, " 
        ");
    $feed .=  "        </item>\n";
 &NBSP}    $feed .=  "    </channel>\n";
   $feed .=  "</rss>\n";
  return  $feed; &NBSP}} class rsscreator20 extends rsscreator091{ function rsscreator20 () { 
 parent::_setrssversion ("2.0"); &NBSP}}

Use examples:

<?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= "page title";
$rss->link= "website http://";
$rss->description= "RSS title";
while ($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");