PHP Generate RSS Subscription class

Here's a sample code that dynamically generates RSS using PHP:

  /**
* * PHP dynamically generated RSS class
**/
Define ("Time_zone", "" ");
Define ("Feedcreator_version", "www.scutephp.com");//Your URL
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 "
  \ n ";
}

function _createadditionalelements ($elements, $indentString = "") {
$ae = "";
if (Is_array ($elements)) {
foreach ($elements as $key = = $value) {
$ae. = $indentString. " < $key > $value
  \ 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) < $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 "
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, "June" =>6, "Jul" =>7, "=>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) * + substr ($matches [7],-2)) * 60;
}else{
if (strlen ($matches [7]) ==1) {
$oneHour = 3600;
=ord ($matches [7]);
if (< ord ("M")) {
$tzOffset = (Ord ("A")--1) * $oneHour;
} elseif (>= ord ("M") && $matches [7]!= "Z") {
$tzOffset = (-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) * + 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; $i 
      
        items); $i + +) {
       
 $feed. = "
       
         items[$i]->link)." \ "/>\n"; 
        
} 
        
 $feed. = "
        
       
      \ n";
 
     
 $feed. = "
     \ n"; 
    
 $feed. = "
   
  \ n ";
if ($this->image!=null) {
$feed. = "Image->url. " \ ">\n";
$feed. = "<title>". $this->image->title."</title>\ n ";
$feed. = "
  
   
  ". $this->image->link."\ n ";
$feed. = "
  
   
    ". $this->image->url."
   
  \ n ";
$feed. = "\ n ";
}
$feed. = $this->_createadditionalelements ($this->additionalelements, "");

for ($i =0; $i
  
   Items), $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 ";
    
}
    
$feed. = "
    <title>". Htmlspecialchars (Strip_tags (STRTR ($this->items[$i]->title," \n\r "," ")))."</title>\ 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 ";
     
$feed. = "
     <title>". Feedcreator::itrunc (Htmlspecialchars ($this->title), 100). "</title>\ 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 ";
     
$feed. = "
     <title>". Feedcreator::itrunc (Htmlspecialchars ($this->image->title), 100). "</title>\ 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), (+). "
      
     \ n ";
     
}
     
if ($this->editor!= "") {
     
$feed. = "
     
      
        ". Feedcreator::itrunc (Htmlspecialchars ($this->editor), (+). "
      
     \ n ";
     
}
     
if ($this->webmaster!= "") {
     
$feed. = "
     
      
        ". Feedcreator::itrunc (Htmlspecialchars ($this->webmaster), (+). "
      
     \ 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). "
      
     \ n ";
     
}
     
if ($this->ttl!= "") {
     
$feed. = "
     
      
       ". Htmlspecialchars ($this->ttl)."
      
     \ n ";
     
}
     
if ($this->rating!= "") {
     
$feed. = "
     
      
        ". Feedcreator::itrunc (Htmlspecialchars ($this->rating). "
      
     \ 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; $i
     
      Items), $i + +) {
      
$feed. = "
      
       \ n ";
       
$feed. = "
       <title>". Feedcreator::itrunc (Htmlspecialchars (strip_tags ($this->items[$i]->title)), 100). "</title>\ 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");
   
}
   

   

  
}

Examples of Use:

  
   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= "URL http:/";
$rss->description= "RSS title";
while ($rowbrs =mysql_fetch_array ($brs)) {
$item =new Feeditem ();
$item->title = $rowbrs [' Subject '];
$item->link= ' http://www.scutephp.com/';
$item->description = $rowbrs [' description '];
$rss->additem ($item);
}
Mysql_close ($DB);
$rss->savefeed ("RSS2.0", "Rss.xml");

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