This is the constructor for the class, and it takes in the three required channel elements to get your RSS feed on it's feet.

$rss = new RSS ('My RSS Feed', 'http://www.website.com/', 'The latest news from my website.');

This method allows you to insert all of the other optional channel elements into your feed. See the examples below. You don't have to keep calling this method for every element, you can just throw everything into an array and call the method only once.

$rss->channel(array('atom:link'=>array('href'=>'http://www.website.com/rss.xml', 'rel'=>'self', 'type'=>'application/rss+xml'), 
                    'language'=>'en-us', 
                    'pubDate'=>'2010-10-28 09:52:33', 
                    'category'=>'news', 
                    'generator'=>'The awesome RSS Class at PHP-Ease.com!' 
                     ));

$rss->channel(array('atom:link'=>array('href'=>'http://www.website.com/rss.xml', 'rel'=>'self', 'type'=>'application/rss+xml')));

$rss->channel(array('language'=>'en-us'));

$rss->channel(array('copyright'=>'Copyright 2010 Website'));

$rss->channel(array('managingEditor'=>'person@website.com'));

$rss->channel(array('webMaster'=>'webmaster@website.com'));

$rss->channel(array('pubDate'=>'today'));

$rss->channel(array('lastBuildDate'=>'yesterday'));

$rss->channel(array('category'=>'news'));

$rss->channel(array('generator'=>'PHP-Ease.com RSS Class'));

$rss->channel(array('docs'=>'http://cyber.law.harvard.edu/rss/rss.html'));

$rss->channel(array('cloud'=>array('domain'=>'rpc.sys.com', 
                                   'port'=>80, 
                                   'path'=>'/RPC2', 
                                   'registerProcedure'=>'myCloud.rssPleaseNotify', 
                                   'protocol'=>'xml-rpc' 
                                   )));

$rss->channel(array('ttl'=>60));

$rss->channel(array('image'=>array('url'=>'http://www.website.com/image.jpg', 
                                   'title'=>'My RSS Feed', 
                                   'link'=>'http://www.website.com/', 
                                   'width'=>'144', // (max - default is 88) 
                                   'height'=>'400', // (max - default is 31) 
                                   'description'=>'a few thoughts...' 
                                   )));

$rss->channel(array('rating'=>'(PICS-1.1 "http://www.classify.org/safesurf/" l r (SS~~000 1))'));

$rss->channel(array('textInput'=>array('title'=>'Search', 
                                       'description'=>'Search Google', 
                                       'link'=>'http://www.google.no/search?', 
                                       'name'=>'q' 
                                       )));

$rss->channel(array('skipHours'=>array(16, 17, 18)));

$rss->channel(array('skipDays'=>array('Saturday', 'Sunday')));

This method creates an item in your feed. The only required element is either the 'title', or a 'description'. We settled on requiring a title.

$rss->item('Item Title', 
           array('link'=>'http://www.website.com/link.html', 
                 'description'=>'A description of the item.', 
                 'pubDate'=>'2004-08-15 16:23:42'));

$elements['link'] = 'http://www.website.com/link.html';

$elements['description'] = 'A description of the item.';

$elements['author'] = 'name@website.com';

$elements['category'] = 'news';

$elements['comments'] = 'http://www.website.com/item.php#comments';

$elements['enclosure'] = array('url'=>'http://www.website.com/audio.mp3', 
                               'length'=>'12216320', 
                               'type'=>'audio/mpeg');

$elements['guid'] = 'http://www.website.com/item.html'; // or . . . 
$elements['guid'] = array('isPermaLink'=>'true', 'value'=>'http://www.website.com/item.html'); // meaning this is a url that can be opened in a browser

$elements['pubDate'] = '2004-08-15 16:23:42';

$elements['source'] = array('url'=>'http://www.otherguys.com/rss.xml', 'value'=>"Other Guy's RSS Feed");

This method puts the whole RSS Feed together, sets the appropriate header, echo's the xml, then exits the script.

$rss->display();

<?php 
 
/* 
 *    author:           Kyle Gadd 
 *    documentation:    http://www.php-ease.com/classes/rss-feed.html 
 * 
 *    This program is free software: you can redistribute it and/or modify 
 *    it under the terms of the GNU General Public License as published by 
 *    the Free Software Foundation, either version 3 of the License, or 
 *    (at your option) any later version. 
 * 
 *    This program is distributed in the hope that it will be useful, 
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of 
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 *    GNU General Public License for more details. 
 * 
 *    You should have received a copy of the GNU General Public License 
 *    along with this program.  If not, see <http://www.gnu.org/licenses/>. 
 */ 
 
class RSS { 
 
  public $encoding = 'utf-8'; 
  private $channel = array(); 
  private $items = array(); 
 
  public function __construct ($title, $link, $description) { 
    $this->channel['title'] = $title; 
    $this->channel['link'] = $link; 
    $this->channel['description'] = $description; 
  } 
   
  public function channel ($elements) { 
    foreach ($elements as $key => $value) $this->channel[$key] = $value; 
  } 
   
  public function item ($title, $elements) { 
    $item = array(); 
    $item['title'] = $title; 
    foreach ($elements as $key => $value) $item[$key] = $value; 
    $this->items[] = $item; 
  } 
   
  public function display () { 
    $xml = '<?xml version="1.0" encoding="' . $this->encoding . '"?>' . "\n"; 
    $xml .= '<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">' . "\n"; 
    $xml .= '<channel>' . "\n"; 
    foreach ($this->channel as $key => $value) $xml .= '  ' . $this->tag($key, $value) . "\n"; 
    foreach ($this->items as $item) { 
      $xml .= "  <item>\n"; 
      foreach ($item as $key => $value) $xml .= '    ' . $this->tag($key, $value) . "\n"; 
      $xml .= "  </item>\n"; 
    } 
    $xml .= '</channel>' . "\n"; 
    $xml .= '</rss>'; 
    header("Content-Type: application/rss+xml"); 
    echo $xml; 
    exit; 
  } 
   
  private function tag ($key, $values) { 
    $tag = ''; 
    list($value, $attributes) = $this->values($values); 
    if (in_array($key, array('pubDate', 'lastBuildDate'))) $value = $this->date($value); 
    if ($key == 'image') { 
      $tag .= '<' . $key . '>'; 
        $tag .= '<url>' . $values['url'] . '</url>'; 
        $tag .= '<title>' . $values['title'] . '</title>'; 
        $tag .= '<link>' . $values['link'] . '</link>'; 
        if (isset($values['width'])) $tag .= '<width>' . $values['width'] . '</width>'; 
        if (isset($values['height'])) $tag .= '<height>' . $values['height'] . '</height>'; 
        if (isset($values['description'])) $tag .= '<description>' . $values['description'] . '</description>'; 
      $tag .= '</' . $key . '>'; 
    } elseif ($key == 'textInput') { 
      $tag .= '<' . $key . '>'; 
        $tag .= '<title>' . $values['title'] . '</title>'; 
        $tag .= '<description>' . $values['description'] . '</description>'; 
        $tag .= '<name>' . $values['name'] . '</name>'; 
        $tag .= '<link>' . $values['link'] . '</link>'; 
      $tag .= '</' . $key . '>'; 
    } elseif ($key == 'skipHours') { 
      $tab .= '<' . $key . '>'; 
      if (!is_array($values)) $values = array($values); 
      foreach ($values as $hour) $tab .= '<hour>' . $hour . '</hour>'; 
      $tab .= '</' . $key . '>'; 
    } elseif ($key == 'skipDays') { 
      $tab .= '<' . $key . '>'; 
      if (!is_array($values)) $values = array($values); 
      foreach ($values as $day) $tab .= '<day>' . $day . '</day>'; 
      $tab .= '</' . $key . '>'; 
    } else { 
      if (!empty($value)) { 
        $tag .= '<' . $key . $attributes . '>' . $value . '</' . $key . '>'; 
      } else { 
        $tag .= '<' . $key . $attributes . ' />'; 
      } 
    } 
    return $tag; 
  } 
   
  private function values ($array) { 
    if (!is_array($array)) return array($array, ''); 
    $value = (isset($array['value'])) ? $array['value'] : ''; 
    unset ($array['value']); 
    $attributes = ''; 
    foreach ($array as $k => $v) { 
      $attributes .= " {$k}=\"" . addslashes($v) . '"'; 
    } 
    return array($value, $attributes); 
  } 
   
  private function date ($date) { 
    return date(DATE_RFC2822, strtotime($date)); 
  } 
 
} 
 
?>