<?php
class DOMrssFeed {
   // required
   public $title='';
   public $link='';
   public $desc='';

   // recommended
   public $atomLink='';
   
   // optional
   public $stylesheet='';
   public $language='en-us';
   public $copyright='';
   public $managingEditor='';
   public $webMaster='';
   public $category='';
   public $generator='';
   public $ttl='';
   public $skipHours = Array();
   public $skipDays = Array();
   
   //for debug
   public $debug = false;
   
   private $docs='http://validator.w3.org/feed/docs/rss2.html';
   private $atomNS = 'http://www.w3.org/2005/Atom';

   public function DOMrssFeed($dom) {
      $this->dom = $dom;
      }
      
   public function makeChannel($pubdate='',$lastbuild='') {
      if (strlen($this->stylesheet) > 0) {
         $instructions = 'type="text/css" href="' . $this->stylesheet . '"';
         $style = $this->dom->createProcessingInstruction('xml-stylesheet',$instructions);
         $this->dom->appendChild($style);
         }
      $root = $this->dom->createElement('rss');
      $root->setAttribute('version','2.0');
      if (strlen($this->atomLink) > 0) {
         $root->setAttribute('xmlns:atom',$this->atomNS);
         }
      $this->dom->appendChild($root);
      $this->channel = $this->dom->createElement('channel');
      $root->appendChild($this->channel);
      if (strlen($this->atomLink) > 0) {
         $atom = $this->dom->createElement('atom:link');
         $atom->setAttribute('href',$this->atomLink);
         $atom->setAttribute('rel','self');
         $atom->setAttribute('type','application/rss+xml');
         $this->channel->appendChild($atom);
         }
      
      $node = $this->dom->createElement('title',$this->title);
      $this->channel->appendChild($node);
      $node = $this->dom->createElement('link',$this->link);
      $this->channel->appendChild($node);
      $node = $this->dom->createElement('description',$this->desc);
      $this->channel->appendChild($node);
      $node = $this->dom->createElement('language',$this->language);
      $this->channel->appendChild($node);
      
      putenv('TZ=GMT');
      if (strlen($pubdate) > 0) {
         $node = $this->dom->createElement('pubDate',date('D, d M Y H:i:s T',$pubdate));
         $this->channel->appendChild($node);
         }
      if (strlen($lastbuild) > 0) {
         $node = $this->dom->createElement('lastBuildDate',date('D, d M Y H:i:s T',$lastbuild));
         $this->channel->appendChild($node);
         }    
      $this->optElements();
      }
      
   public function addImage($url,$title='',$link='',$width='',$height='',$description='') {
      $image = $this->dom->createElement('image');
      $this->channel->appendChild($image);
      $node = $this->dom->createElement('url',$url);
      $image->appendChild($node);
      if (strlen($title) > 0) {
         $imtitle = $title;
         } else {
         $imtitle = $this->title;
         }
      $node = $this->dom->createElement('title',$imtitle);
      $image->appendChild($node);
      if (strlen($link) > 0) {
         $imlink = $link;
         } else {
         $imlink = $this->link;
         }
      $node = $this->dom->createElement('link',$imlink);
      $image->appendChild($node);
      if (strlen($Width) > 0) {
         $node = $this->dom->createElement('width',$width);
         $image->appendChild($node);
         }
      if (strlen($Height) > 0) {
         $node = $this->dom->createElement('height',$height);
         $image->appendChild($node);
         }
      if (strlen($Description) > 0) {
         $node = $this->dom->createElement('description',$description);
         $image->appendChild($node);
         }
      }
      
   public function cloud($domain,$port,$path,$registerProcedure,$protocol) {
      $node = $this->dom->createElement('cloud');
      $this->channel->appendChild($node);
      $node->setAttribute('domain',$domain);
      $node->setAttribute('port',$port);
      $node->setAttribute('path',$path);
      $node->setAttribute('registerProcedure',$registerProcedure);
      $node->setAttribute('protocol',$protocol);
      }
      
   public function textInput($name,$description,$cgi,$submit='Submit') {
      $ti = $this->dom->createElement('textInput');
      $this->channel->appendChild($textInput);
      $node = $this->dom->createElement('name',$name);
      $ti->appendChild($node);
      $node = $this->dom->createElement('description',$description);
      $ti->appendChild($node);
      $node = $this->dom->createElement('link',$cgi);
      $ti->appendChild($node);
      $node = $this->dom->createElement('title',$submit);
      $ti->appendChild($node);
      }
      
   public function newItem($title='',$desc='',$link='',$pubdate='') {
      if (isset($this->item)) {
         $this->channel->appendChild($this->item);
         }
      $this->item = $this->dom->createElement('item');
      if (strlen($title) > 0) {
         $node = $this->dom->createElement('title',$title);
         $this->item->appendChild($node);
         }
      if (strlen($desc) > 0) {
         $node = $this->dom->createElement('description',$desc);
         $this->item->appendChild($node);
         }
      if (strlen($link) > 0) {
         $node = $this->dom->createElement('link',$link);
         $this->item->appendChild($node);
         }
      if (strlen($pubdate) > 0) {
         putenv('TZ=GMT');
         $node = $this->dom->createElement('pubDate',date('D, d M Y H:i:s T',$pubdate));
         $this->item->appendChild($node);
         }
      }
      
   public function addCategory($cat,$domain='') {
      $node = $this->dom->createElement('category',$cat);
      $this->item->appendChild($node);
      if (strlen($domain) > 0) {
         $node->setAttribute('domain',$domain);
         }
      }
      
   public function addMedia($url,$size,$mime) {
      $node = $this->dom->createElement('enclosure');
      $this->item->appendChild($node);
      $node->setAttribute('url',$url);
      $node->setAttribute('length',$size);
      $node->setAttribute('type',$mime);
      }
      
   public function addGuid($guid,$permalink=true) {
      $node = $this->dom->createElement('guid',$guid);
      $this->item->appendChild($node);
      if ($permalink) {
         $node->setAttribute('isPermaLink','true');
         } else {
         $node->setAttribute('isPermaLink','false');
         }
      }
      
   public function addExtraData($author='',$comments='') {
      if (strlen($author) > 0) {
         $node = $this->dom->createElement('author',$author);
         $this->item->appendChild($node);
         }
      if (strlen($comments) > 0) {
         $node = $this->dom->createElement('comments',$comments);
         $this->item->appendChild($node);
         }
      }
      
   public function itemSource($source,$url) {
      $node = $this->dom->createElement('source',$source);
      $this->item->appendChild($node);
      $node->setAttribute('url',$url);
      }
      
   public function addCdata($string) {
      $cdata = $this->dom->createCDATASection($string);
      $this->item->appendChild($cdata);
      }

   public function sendRss() {
      if (isset($this->item)) {
         $this->channel->appendChild($this->item);
         }
      if ($this->debug) {
         header('Content-type: text/plain');
         } else {
         header('Content-type: application/rss+xml');
         }
      print $this->dom->saveXML();
      }
      
   private function optElements() {
      if (strlen($this->copyright) > 0) {
         $node = $this->dom->createElement('copyright',$this->copyright);
         $this->channel->appendChild($node);
         }
      if (strlen($this->managingEditor) > 0) {
         $node = $this->dom->createElement('managingEditor',$this->managingEditor);
         $this->channel->appendChild($node);
         }
      if (strlen($this->webMaster) > 0) {
         $node = $this->dom->createElement('webMaster',$this->webMaster);
         $this->channel->appendChild($node);
         }
      if (strlen($this->category) > 0) {
         $node = $this->dom->createElement('category',$this->category);
         $this->channel->appendChild($node);
         }
      if (strlen($this->generator) > 0) {
         $gen = $this->generator;
         } else {
         $gen = 'PHP ' . phpversion() . ' DOMDocument / libxml ' . LIBXML_DOTTED_VERSION;
         }
      $node = $this->dom->createElement('generator',$gen);
      $this->channel->appendChild($node);
      if (strlen($this->docs) > 0) {
         $node = $this->dom->createElement('docs',$this->docs);
         $this->channel->appendChild($node);
         }
      if (strlen($this->ttl) > 0) {
         $node = $this->dom->createElement('ttl',$this->ttl);
         $this->channel->appendChild($node);
         }
      if (sizeof($this->skipHours) > 0) {
         $sh = $this->dom->createElement('skipHours');
         $this->channel->appendChild($sh);
         for ($i=0;$i<sizeof($this->skipHours);$i++) {
            $node = $this->dom->createElement('hour',$this->skipHours[$i]);
            $sh->appendChild($node);
            }
         }
      if (sizeof($this->skipDays) > 0) {
         $sd = $this->dom->createElement('skipDays');
         $this->channel->appendChild($sd);
         for ($i=0;$i<sizeof($this->skipDays);$i++) {
            $node = $this->dom->createElement('day',$this->skipDays[$i]);
            $sh->appendChild($node);
            }
         }
      }
      
   } // end of class
?>