<?php
/***************************************************************************
FeedCreator class v2.0 -
Mods for NPDS SABLE: time, date, encoding and some other things
Mods for NPDS REv 13: support for PHP 5.5.x and other things
Mods for NPDS REv 16: support for PHP 7.x and other things
Mods for NPDS REv [current]: cleaned timezone handling

originally (c) Kai Blankenhorn
www.bitfolge.de
kaib@bitfolge.de
v1.3 work by Scott Reynen (scott@randomchaos.com) and Kai Blankenhorn
v1.5 OPML support by Dirk Clemens

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
****************************************************************************/

/*** GENERAL USAGE *********************************************************

include("feedcreator.class.php");

$rss = new UniversalFeedCreator();
$rss->useCached(); // use cached version if age<1 hour

$rss->title = "PHP news";
$rss->description = "daily news from the PHP scripting world";
//optional
$rss->descriptionTruncSize = 500;
$rss->descriptionHtmlSyndicated = true;

$rss->link = "http://www.dailyphp.net/news";
$rss->syndicationURL = "http://www.dailyphp.net/".$_SERVER["PHP_SELF"];

$image = new FeedImage();
$image->title = "dailyphp.net logo";
$image->url = "http://www.dailyphp.net/images/logo.gif";
$image->link = "http://www.dailyphp.net";
$image->description = "Feed provided by dailyphp.net. Click to visit.";
//optional
$image->descriptionTruncSize = 500;
$image->descriptionHtmlSyndicated = true;

$rss->image = $image;

// get your news items from somewhere, e.g. your database:
mysql_select_db($dbHost, $dbUser, $dbPass);
$res = mysql_query("SELECT * FROM news ORDER BY newsdate DESC");
while ($data = mysql_fetch_object($res)) {
    $item = new FeedItem();
    $item->title = $data->title;
    $item->link = $data->url;
    $item->description = $data->short;

    //optional
    item->descriptionTruncSize = 500;
    item->descriptionHtmlSyndicated = true;

    $item->date = $data->newsdate;
    $item->source = "http://www.dailyphp.net";
    $item->author = "John Doe";

    $rss->addItem($item);
}

// valid format strings are: RSS0.91, RSS1.0, RSS2.0, MBOX, OPML, ATOM
echo $rss->saveFeed("RSS1.0", "news/feed.xml");

***************************************************************************
*          A little setup                                                 *
**************************************************************************/
// Version string.
define("FEEDCREATOR_VERSION", "FeedCreator 2.0 for NPDS");

// A FeedItem is a part of a FeedCreator feed.
class FeedItem extends HtmlDescribable {
   // Mandatory attributes of an item.
   var $title, $description, $link;
   //Optional attributes of an item.
   var $author, $authorEmail, $image, $category, $comments, $guid, $source, $creator;
   /**
   * Publishing date of an item. May be in one of the following formats:
   * RFC 822:
   * "Mon, 20 Jan 03 18:05:41 +0400"
   * "20 Jan 03 18:05:41 +0000"
   * ISO 8601:
   * "2003-01-20T18:05:41+04:00"
   * Unix:
   * 1043082341
   */
   var $date;
   /**
    * Any additional elements to include as an assiciated array. All $key => $value pairs
    * will be included unencoded in the feed item in the form
    *     <$key>$value</$key>
    * Again: No encoding will be used! This means you can invalidate or enhance the feed
    * if $value contains markup. This may be abused to embed tags not implemented by
    * the FeedCreator class used.
    */
   var $additionalElements = Array();
}

// A FeedImage may be added to a FeedCreator feed.
class FeedImage extends HtmlDescribable {
   /**
    * Mandatory attributes of an image.
    */
   var $title, $url, $link;

   /**
    * Optional attributes of an image.
    */
   var $width, $height, $description;
}

/**
 * An HtmlDescribable is an item within a feed that can have a description that may
 * include HTML markup.
 */
class HtmlDescribable {
   /**
    * Indicates whether the description field should be rendered in HTML.
    */
   var $descriptionHtmlSyndicated;

   /**
    * Indicates whether and to how many characters a description should be truncated.
    */
   var $descriptionTruncSize;

   /**
    * Returns a formatted description field, depending on descriptionHtmlSyndicated and
    * $descriptionTruncSize properties
    * @return    string    the formatted description
    */
   function getDescription() {
      $descriptionField = new FeedHtmlField($this->description);
      $descriptionField->syndicateHtml = $this->descriptionHtmlSyndicated;
      $descriptionField->truncSize = $this->descriptionTruncSize;
      return $descriptionField->output();
   }
}

/**
 * An FeedHtmlField describes and generates
 * a feed, item or image html field (probably a description). Output is
 * generated based on $truncSize, $syndicateHtml properties.
 * @author Pascal Van Hecke <feedcreator.class.php@vanhecke.info>
 * @version 1.6
 */
class FeedHtmlField {
   // Mandatory attributes of a FeedHtmlField.
   var $rawFieldContent;
   // Optional attributes of a FeedHtmlField.
   var $truncSize, $syndicateHtml;
   /**
   * Creates a new instance of FeedHtmlField.
   * @param  $string: if given, sets the rawFieldContent property
   */
   public function __construct($parFieldContent) {
      if ($parFieldContent)
         $this->rawFieldContent = $parFieldContent;
   }
   /**
   * Creates the right output, depending on $truncSize, $syndicateHtml properties.
   * @return string the formatted field
   */
   function output() {
      // when field available and syndicated in html we assume
      // - valid html in $rawFieldContent and we enclose in CDATA tags
      // - no truncation (truncating risks producing invalid html)
      if (!$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,ENT_COMPAT|ENT_HTML401,'UTF-8'),$this->truncSize);
         else
            $result = htmlspecialchars($this->rawFieldContent,ENT_COMPAT|ENT_HTML401,'UTF-8');
      }
      return $result;
   }
}

/**
* UniversalFeedCreator lets you choose during runtime which format to build.
* For general usage of a feed class, see the FeedCreator class below or the example above.
* @author Kai Blankenhorn <kaib@bitfolge.de>
*/
class UniversalFeedCreator extends FeedCreator {
   var $_feed;
   function _setFormat($format) {
      switch (strtoupper($format)) {
         case '2.0': case 'RSS2.0':
            $this->_feed = new RSSCreator20();
         break;
         case '1.0': case 'RSS1.0':
            $this->_feed = new RSSCreator10(); //  ✅ valid checker (quelques améliorations)
         break;
         case '0.91': case 'RSS0.91':
            $this->_feed = new RSSCreator091();
         break;
         case 'MBOX':
            $this->_feed = new MBOXCreator();
         break;
         case 'OPML':
            $this->_feed = new OPMLCreator(); // ✅ valid checker (quelques améliorations)
         break;
         case 'ATOM':
            $this->_feed = new AtomCreator03(); // ✅ valid checker (quelques améliorations)
         break;
         default:
            $this->_feed = new RSSCreator091();// ✅ valid checker (quelques améliorations)
         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};
      }
   }

   /**
   * Creates a syndication feed based on the items previously added.
   * @see      FeedCreator::addItem()
   * @return   string    the contents of the feed.
   */
   function createFeed($format = 'RSS0.91') {
      $this->_setFormat($format);
      return $this->_feed->createFeed();
   }

   /**
   * Saves this feed as a file on the local disk. After the file is saved, an HTTP redirect
   * header may be sent to redirect the use to the newly created file.
   * @param   string   filename optional the filename where a recent version of the feed is saved. If not specified, the filename is $_SERVER["PHP_SELF"] with the extension changed to .xml (see _generateFilename()).
   * @param   boolean  displayContents   optional send the content of the file or not. If true, the file will be sent in the body of the response.
   */
   function saveFeed($format = 'RSS0.91', $filename = '', $displayContents = true) {
      $this->_setFormat($format);
      $this->_feed->saveFeed($filename, $displayContents);
   }

   /**
   * Turns on caching and checks if there is a recent version of this feed in the cache.
   * If there is, an HTTP redirect header is sent.
   * To effectively use caching, you should create the FeedCreator object and call this method
   * before anything else, especially before you do the time consuming task to build the feed
   * (web fetching, for example).
   * @param filename   string   optional the filename where a recent version of the feed is saved. If not specified, the filename is $_SERVER["PHP_SELF"] with the extension changed to .xml (see _generateFilename()).
   * @param timeout int      optional the timeout in seconds before a cached version is refreshed (defaults to 3600 = 1 hour)
   */
   function useCached($format = 'RSS0.91', $filename = '', $timeout = 3600) {
      $this->_setFormat($format);
      $this->_feed->useCached($filename, $timeout);
   }
}

/**
 * FeedCreator is the abstract base implementation for concrete
 * implementations that implement a specific format of syndication.
 * @abstract
 * @author Kai Blankenhorn <kaib@bitfolge.de>
 */
class FeedCreator extends HtmlDescribable {
   // Mandatory attributes of a feed.
   var $title, $description, $link;
   // Optional attributes of a feed.
   var $syndicationURL, $image, $language, $copyright, $pubDate, $lastBuildDate, $editor, $editorEmail, $webmaster, $category, $docs, $ttl, $rating, $skipHours, $skipDays;
   /**
   * The url of the external xsl css stylesheet used to format the naked rss feed.
   * Ignored in the output when empty.
   */
   var $xslStyleSheet = '';
   var $cssStyleSheet = 'http://www.w3.org/2000/08/w3c-synd/style.css';
   // @access private
   var $items = Array();
   /**
   * This feed's MIME content type.
   * @access private
   */
   var $contentType = 'application/xml';
   // This feed's character encoding.
   var $encoding = 'UTF-8';
   /**
   * Any additional elements to include as an assiciated array. All $key => $value pairs
   * will be included unencoded in the feed in the form
   *     <$key>$value</$key>
   * Again: No encoding will be used! This means you can invalidate or enhance the feed
   * if $value contains markup. This may be abused to embed tags not implemented by
   * the FeedCreator class used.
   */
   var $additionalElements = Array();
   /**
   * Adds an FeedItem to the feed.
   * @param object FeedItem $item The FeedItem to add to the feed.
   * @access public
   */
   function addItem($item) {
      $this->items[] = $item;
   }
   /**
   * Truncates a string to a certain length at the most sensible point.
   * First, if there's a '.' character near the end of the string, the string is truncated after this character.
   * If there is no '.', the string is truncated after the last ' ' character.
   * If the string is truncated, " ..." is appended.
   * If the string is already shorter than $length, it is returned unchanged.
   * @static
   * @param string    string A string to be truncated.
   * @param int        length the maximum length the string should be truncated to
   * @return string    the truncated string
   */
   function iTrunc($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).' ...';
   }

   /**
   * Creates a comment indicating the generator of this feed.
   * The format of this comment seems to be recognized by
   * Syndic8.com.
   */
   function _createGeneratorComment() {
      return '<!-- generator="'.FEEDCREATOR_VERSION.'" -->'."\n";
   }

   /**
   * Creates a string containing all additional elements specified in
   * $additionalElements.
   * @param   elements array an associative array containing key => value pairs
   * @param indentString  string   a string that will be inserted before every generated line
   * @return    string    the XML tags corresponding to $additionalElements
   */
   function _createAdditionalElements($elements, $indentString = '') {
      $ae = '';
      if (is_array($elements)) {
         foreach($elements AS $key => $value) {
            $ae .= $indentString."<$key>$value</$key>\n";
         }
      }
      return $ae;
   }

   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;
   }

   /**
    * Builds the feed's text.
    * @abstract
    * @return    string    the feed's complete text
    */
   function createFeed() {
   }

   /**
    * Generate a filename for the feed cache file. The result will be $_SERVER["PHP_SELF"] with the extension changed to .xml.
    * @return string the feed cache filename
    * @since 1.4
    * @access private
    */
   function _generateFilename() {
      $fileInfo = pathinfo($_SERVER['PHP_SELF']);
      return substr($fileInfo["basename"],0,-(strlen($fileInfo["extension"]) + 1)).".xml";
   }

   /**
    * @since 1.4
    * @access private
    */
   function _redirect($filename) {
      Header("Content-Type: ".$this->contentType."; filename=".basename($filename));
      Header("Content-Disposition: inline; filename=".basename($filename));
      readfile($filename, "r");
      die();
   }

   /**
    * Turns on caching and checks if there is a recent version of this feed in the cache.
    * If there is, an HTTP redirect header is sent.
    * To effectively use caching, you should create the FeedCreator object and call this method
    * before anything else, especially before you do the time consuming task to build the feed
    * (web fetching, for example).
    * @since 1.4
    * @param filename   string   optional the filename where a recent version of the feed is saved. If not specified, the filename is $_SERVER["PHP_SELF"] with the extension changed to .xml (see _generateFilename()).
    * @param timeout int      optional the timeout in seconds before a cached version is refreshed (defaults to 3600 = 1 hour)
    */
   function useCached($filename = '', $timeout = 3600) {
      if ($filename == '') 
         $filename = $this->_generateFilename();
      if (file_exists($filename) and (time() - filemtime($filename) < $timeout))
         $this->_redirect($filename);
   }

   /**
    * Saves this feed as a file on the local disk. After the file is saved, a redirect
    * header may be sent to redirect the user to the newly created file.
    * @since 1.4
    *
    * @param filename   string   optional the filename where a recent version of the feed is saved. If not specified, the filename is $_SERVER["PHP_SELF"] with the extension changed to .xml (see _generateFilename()).
    * @param redirect   boolean  optional send an HTTP redirect header or not. If true, the user will be automatically redirected to the created file.
    */
   function saveFeed($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 '<br /><b>Erreur de création du fichier de canal / Error creating feed file</b><br />';
   }
}

/**
 * FeedDate is an internal class that stores a date for a feed or feed item.
 * Usually, you won't need to use this.
 * Updated for proper timezone handling - uses system timezone from mainfile.php
 */
class FeedDate {
   var $unix;
   /**
    * Creates a new instance of FeedDate representing a given date.
    * Accepts RFC 822, ISO 8601 date formats as well as unix time stamps.
    * @param mixed $dateString optional the date this FeedDate will represent. If not specified, the current date and time is used.
    */
   public function __construct($dateString = '') {
      if ($dateString == '')
         $dateString = time();
      if (is_integer($dateString)) {
         $this->unix = $dateString;
         return;
      }
      // Use system timezone (already set in mainfile.php via $gmt)
      $this->unix = strtotime($dateString);
   }

   /**
    * Gets the date stored in this FeedDate as an RFC 822 date.
    * Uses system timezone from mainfile.php
    *
    * @return a date in RFC 822 format
    */
   function rfc822() {
      return date('r', $this->unix);
   }

   /**
    * Gets the date stored in this FeedDate as an ISO 8601 date.
    * Uses system timezone from mainfile.php
    *
    * @return a date in ISO 8601 format
    */
   function iso8601() {
      return date('c', $this->unix);
   }

   /**
    * Gets the date stored in this FeedDate as unix time stamp.
    *
    * @return a date as a unix time stamp
    */
   function unix() {
      return $this->unix;
   }
}

/**
 * RSSCreator10 is a FeedCreator that implements RDF Site Summary (RSS) 1.0.
 *
 * @see http://www.purl.org/rss/1.0/
 * @since 1.3
 * @author Kai Blankenhorn <kaib@bitfolge.de>
 */
class RSSCreator10 extends FeedCreator {

   /**
    * Builds the RSS feed's text. The feed will be compliant to RDF Site Summary (RSS) 1.0.
    * The feed will contain all items previously added in the same order.
    * @return    string    the feed's complete text
    */
   function createFeed() {
      $feed = "<?xml version=\"1.0\" encoding=\"".$this->encoding."\"?>\n";
      $feed .= $this->_createGeneratorComment();
      // $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,ENT_COMPAT|ENT_HTML401,$this->encoding)."</title>\n";
      $feed .= "        <description>".htmlspecialchars($this->description,ENT_COMPAT|ENT_HTML401,$this->encoding)."</description>\n";
      $feed .= "        <link>".$this->link."</link>\n";
      if ($this->image!=null)
         $feed .= "        <image rdf:resource=\"".$this->image->url."\" />\n";
      $now = new FeedDate();
      $feed .= "       <dc:date>".htmlspecialchars($now->iso8601(),ENT_COMPAT|ENT_HTML401,$this->encoding)."</dc:date>\n";
      $feed .= "        <items>\n";
      $feed .= "            <rdf:Seq>\n";
      for ($i=0;$i<count($this->items);$i++) {
         $feed .= "                <rdf:li rdf:resource=\"".htmlspecialchars($this->items[$i]->link,ENT_COMPAT|ENT_HTML401,$this->encoding)."\"/>\n";
      }
      $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";
      }
      $feed .= $this->_createAdditionalElements($this->additionalElements, '    ');

      for ($i = 0; $i < count($this->items); $i++) {
         $feed .= "    <item rdf:about=\"".htmlspecialchars($this->items[$i]->link,ENT_COMPAT|ENT_HTML401,$this->encoding)."\">\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(),ENT_COMPAT|ENT_HTML401,$this->encoding)."</dc:date>\n";
         }
         if ($this->items[$i]->source != '') {
            $feed .= "        <dc:source>".htmlspecialchars($this->items[$i]->source,ENT_COMPAT|ENT_HTML401,$this->encoding)."</dc:source>\n";
         }
         if ($this->items[$i]->author != '') {
            $feed .= "        <dc:creator>".htmlspecialchars($this->items[$i]->author,ENT_COMPAT|ENT_HTML401,$this->encoding)."</dc:creator>\n";
         }
         $feed .= "        <title>".htmlspecialchars(strip_tags(strtr($this->items[$i]->title,"\n\r","  ")),ENT_COMPAT|ENT_HTML401,$this->encoding)."</title>\n";
         $feed .= "        <link>".htmlspecialchars($this->items[$i]->link,ENT_COMPAT|ENT_HTML401,$this->encoding)."</link>\n";
         $feed .= "        <description>".htmlspecialchars($this->items[$i]->description,ENT_COMPAT|ENT_HTML401,$this->encoding)."</description>\n";
         $feed .= $this->_createAdditionalElements($this->items[$i]->additionalElements, "        ");
         $feed .= "    </item>\n";
      }
      $feed .= "</rdf:RDF>\n";
      return $feed;
   }
}

/**
 * RSSCreator091 is a FeedCreator that implements RSS 0.91 Spec, revision 3.
 *
 * @see http://my.netscape.com/publish/formats/rss-spec-0.91.html
 * @author Kai Blankenhorn <kaib@bitfolge.de>
 */
class RSSCreator091 extends FeedCreator {
   /**
    * Stores this RSS feed's version number.
    * @access private
    */
   var $RSSVersion;
   public function __construct() {
      $this->_setRSSVersion("0.91");
      $this->contentType = "application/rss+xml";
   }
   /**
    * Sets this RSS feed's version number.
    * @access private
    */
   function _setRSSVersion($version) {
      $this->RSSVersion = $version;
   }
   /**
    * Builds the RSS feed's text. The feed will be compliant to RDF Site Summary (RSS) 1.0.
    * The feed will contain all items previously added in the same order.
    * @return    string    the feed's complete text
    */
   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,ENT_COMPAT|ENT_HTML401,$this->encoding),100).'</title>'."\n";
      $this->descriptionTruncSize = 500;
      $feed .= '        <description>'.$this->getDescription().'</description>'."\n";
      $feed .= '        <link>'.$this->link.'</link>'."\n";
      $now = new FeedDate();
      $feed .= '        <lastBuildDate>'.htmlspecialchars($now->rfc822(),ENT_COMPAT|ENT_HTML401,$this->encoding).'</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,ENT_COMPAT|ENT_HTML401,$this->encoding),100).'</title>'."\n";
         $feed .= '            <link>'.$this->image->link.'</link>'."\n";
         if ($this->image->width != '')
            $feed .= '            <width>'.$this->image->width.'</width>'."\n";
         if ($this->image->height != '')
            $feed .= '            <height>'.$this->image->height.'</height>'."\n";
         if ($this->image->description != '')
            $feed .= '           <description>'.$this->image->getDescription().'</description>'."\n";
         $feed .= '        </image>'."\n";
      }
      if ($this->language != '')
         $feed .= "        <language>".$this->language."</language>\n";
      if ($this->copyright != '')
         $feed .= "        <copyright>".FeedCreator::iTrunc(htmlspecialchars($this->copyright,ENT_COMPAT|ENT_HTML401,$this->encoding),100)."</copyright>\n";
      if ($this->editor != '')
         $feed .= "        <managingEditor>".FeedCreator::iTrunc(htmlspecialchars($this->editor,ENT_COMPAT|ENT_HTML401,$this->encoding),100)."</managingEditor>\n";
      if ($this->webmaster != '')
         $feed .= "        <webMaster>".FeedCreator::iTrunc(htmlspecialchars($this->webmaster,ENT_COMPAT|ENT_HTML401,$this->encoding),100)."</webMaster>\n";
      if ($this->pubDate != '') {
         $pubDate = new FeedDate($this->pubDate);
         $feed .= "        <pubDate>".htmlspecialchars($pubDate->rfc822(),ENT_COMPAT|ENT_HTML401,$this->encoding)."</pubDate>\n";
      }
      if ($this->category != '')
         $feed .= "        <category>".htmlspecialchars($this->category,ENT_COMPAT|ENT_HTML401,$this->encoding)."</category>\n";
      if ($this->docs != '')
         $feed .= "        <docs>".FeedCreator::iTrunc(htmlspecialchars($this->docs,ENT_COMPAT|ENT_HTML401,$this->encoding),500)."</docs>\n";
      if ($this->ttl != '')
         $feed .= "        <ttl>".htmlspecialchars($this->ttl,ENT_COMPAT|ENT_HTML401,$this->encoding)."</ttl>\n";
      if ($this->rating != '')
         $feed .= "        <rating>".FeedCreator::iTrunc(htmlspecialchars($this->rating,ENT_COMPAT|ENT_HTML401,$this->encoding),500)."</rating>\n";
      if ($this->skipHours != '')
         $feed .= "        <skipHours>".htmlspecialchars($this->skipHours,ENT_COMPAT|ENT_HTML401,$this->encoding)."</skipHours>\n";
      if ($this->skipDays != '')
         $feed .= "        <skipDays>".htmlspecialchars($this->skipDays,ENT_COMPAT|ENT_HTML401,$this->encoding)."</skipDays>\n";
      $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[$i]->title),ENT_COMPAT|ENT_HTML401,$this->encoding),100)."</title>\n";
         $feed .= "            <link>".htmlspecialchars($this->items[$i]->link,ENT_COMPAT|ENT_HTML401,$this->encoding)."</link>\n";
         $feed .= "            <description>".$this->items[$i]->getDescription()."</description>\n";

         if ($this->items[$i]->author != '')
            $feed .= "            <author>".htmlspecialchars($this->items[$i]->author,ENT_COMPAT|ENT_HTML401,$this->encoding)."</author>\n";
         if ($this->items[$i]->category != '')
            $feed .= "            <category>".htmlspecialchars($this->items[$i]->category,ENT_COMPAT|ENT_HTML401,$this->encoding)."</category>\n";
         if ($this->items[$i]->comments != '')
            $feed .= "            <comments>".htmlspecialchars($this->items[$i]->comments,ENT_COMPAT|ENT_HTML401,$this->encoding)."</comments>\n";
         if ($this->items[$i]->date != '') {
            $itemDate = new FeedDate($this->items[$i]->date);
            $feed .= '            <pubDate>'.htmlspecialchars($itemDate->rfc822(),ENT_COMPAT|ENT_HTML401,$this->encoding).'</pubDate>'."\n";
         }
         if ($this->items[$i]->guid != '')
            $feed .= '            <guid>'.htmlspecialchars($this->items[$i]->guid,ENT_COMPAT|ENT_HTML401,$this->encoding).'</guid>'."\n";
         $feed .= $this->_createAdditionalElements($this->items[$i]->additionalElements, '        ');
         $feed .= '        </item>'."\n";
      }
      $feed .= '    </channel>'."\n";
      $feed .= '</rss>'."\n";
      return $feed;
   }
}

/**
 * RSSCreator20 is a FeedCreator that implements RDF Site Summary (RSS) 2.0.
 *
 * @see http://backend.userland.com/rss
 * @since 1.3
 * @author Kai Blankenhorn <kaib@bitfolge.de>
 */
class RSSCreator20 extends RSSCreator091 {
   public function __construct() {
      parent::_setRSSVersion("2.0");
   }
}

/**
 * AtomCreator03 is a FeedCreator that implements the atom specification,
 * as in http://www.intertwingly.net/wiki/pie/FrontPage.
 * Please note that just by using AtomCreator03 you won't automatically
 * produce valid atom files. For example, you have to specify either an editor
 * for the feed or an author for every single feed item.
 *
 * Some elements have not been implemented yet. These are (incomplete list):
 * author URL, item author's email and URL, item contents, alternate links,
 * other link content types than text/html. Some of them may be created with
 * AtomCreator03::additionalElements.
 *
 * @see FeedCreator#additionalElements
 * @since 1.6
 * @author Kai Blankenhorn <kaib@bitfolge.de>, Scott Reynen <scott@randomchaos.com>
 */
class AtomCreator03 extends FeedCreator {
   public function __construct() {
      $this->contentType = "application/atom+xml";
      $this->encoding = "utf-8";
   }
   function createFeed() {
      $feed = "<?xml version=\"1.0\" encoding=\"".$this->encoding."\"?>\n";
      $feed .= $this->_createGeneratorComment();
      $feed .= "<feed xmlns=\"http://www.w3.org/2005/Atom\" ";
      if ($this->language != '')
         $feed .= " xml:lang=\"".$this->language."\"";
      $feed .= ">\n";
      $feed .= "    <title type=\"html\">".htmlspecialchars($this->title,ENT_COMPAT|ENT_HTML401,$this->encoding)."</title>\n";
      $feed .= "    <subtitle>".htmlspecialchars($this->description,ENT_COMPAT|ENT_HTML401,$this->encoding)."</subtitle>\n";
      $feed .= "    <link rel=\"alternate\" type=\"text/html\" href=\"".htmlspecialchars($this->link,ENT_COMPAT|ENT_HTML401,$this->encoding)."\"/>\n";
      $feed .= "    <id>".htmlspecialchars($this->link,ENT_COMPAT|ENT_HTML401,$this->encoding)."/</id>\n";
      $now = new FeedDate();
      $feed .= "    <updated>".htmlspecialchars($now->iso8601(),ENT_COMPAT|ENT_HTML401,$this->encoding)."</updated>\n";
      if ($this->editor != '') {
         $feed .= "    <author>\n";
         $feed .= "        <name>".$this->editor."</name>\n";
         if ($this->editorEmail != '')
            $feed .= "        <email>".$this->editorEmail."</email>\n";
         $feed .= "    </author>\n";
      }
      $feed.= "    <generator>".FEEDCREATOR_VERSION."</generator>\n";
      $feed.= $this->_createAdditionalElements($this->additionalElements, "    ");
      for ($i=0;$i<count($this->items);$i++) {
         $feed .= "    <entry>\n";
         $feed .= "        <title type=\"html\">".htmlspecialchars(strip_tags($this->items[$i]->title),ENT_COMPAT|ENT_HTML401,$this->encoding)."</title>\n";
         $feed .= "        <link rel=\"alternate\" type=\"text/html\" href=\"".htmlspecialchars($this->items[$i]->link,ENT_COMPAT|ENT_HTML401,$this->encoding)."\"/>\n";
         if ($this->items[$i]->date=="") {
            $this->items[$i]->date = time();
         }
         $itemDate = new FeedDate($this->items[$i]->date);
/*
         $feed.= "        <created>".htmlspecialchars($itemDate->iso8601(),ENT_COMPAT|ENT_HTML401,$this->encoding)."</created>\n";
         $feed.= "        <issued>".htmlspecialchars($itemDate->iso8601(),ENT_COMPAT|ENT_HTML401,$this->encoding)."</issued>\n";
*/
         $feed .= "        <updated>".htmlspecialchars($itemDate->iso8601(),ENT_COMPAT|ENT_HTML401,$this->encoding)."</updated>\n";
         $feed .= "        <id>".htmlspecialchars($this->items[$i]->link,ENT_COMPAT|ENT_HTML401,$this->encoding)."</id>\n";
         $feed .= $this->_createAdditionalElements($this->items[$i]->additionalElements, "        ");
         if ($this->items[$i]->author != '') {
            $feed .= "        <author>\n";
            $feed .= "            <name>".htmlspecialchars($this->items[$i]->author,ENT_COMPAT|ENT_HTML401,$this->encoding)."</name>\n";
            $feed .= "        </author>\n";
         }
         if ($this->items[$i]->description != '') {
            $feed .= "        <summary type=\"html\">".htmlspecialchars($this->items[$i]->description,ENT_COMPAT|ENT_HTML401,$this->encoding)."</summary>\n";
         }
         $feed .= "    </entry>\n";
      }
      $feed .= "</feed>\n";
      return $feed;
   }
}

/**
* MBOXCreator is a FeedCreator that implements the mbox format
* as described in http://www.qmail.org/man/man5/mbox.html
* @author Kai Blankenhorn <kaib@bitfolge.de>
*/
class MBOXCreator extends FeedCreator {
   public function __construct() {
      $this->contentType = "text/plain";
      $this->encoding = "ISO-8859-15";
   }

   function qp_enc($input = '', $line_max = 76) {
      $hex = array('0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F');
      $lines = preg_split("/(?:\r\n|\r|\n)/", $input);
      $eol = "\r\n";
      $escape = '=';
      $output = '';
      foreach($lines as $line){
         $linlen = strlen($line);
         $newline = '';
         for($i = 0; $i < $linlen; $i++) {
            $c = substr($line, $i, 1);
            $dec = ord($c);
            if ( ($dec == 32) && ($i == ($linlen - 1)) ) { // convert space at eol only
               $c = "=20";
            } elseif ( ($dec == 61) || ($dec < 32 ) || ($dec > 126) ) { // always encode "\t", which is *not* required
               $h2 = floor($dec/16); $h1 = floor($dec%16);
               $c = $escape.$hex["$h2"].$hex["$h1"];
            }
            if ( (strlen($newline) + strlen($c)) >= $line_max ) { // CRLF is not counted
               $output .= $newline.$escape.$eol; // soft line break; " =\r\n" is okay
               $newline = '';
            }
            $newline .= $c;
         } // end of for
         $output .= $newline.$eol;
      }
      return trim($output);
   }

   /**
    * Builds the MBOX contents.
    * @return    string    the feed's complete text
    */
   function createFeed() {
      for ($i=0;$i<count($this->items);$i++) {
         if ($this->items[$i]->author!="")
            $from = $this->items[$i]->author;
         else
            $from = $this->title;
         $itemDate = new FeedDate($this->items[$i]->date);
         $feed .= "From ".strtr(MBOXCreator::qp_enc($from)," ","_")." ".date("D M d H:i:s Y",$itemDate->unix())."\n";
         $feed .= "Content-Type: text/plain;\n";
         $feed .= "   charset=\"".$this->encoding."\"\n";
         $feed .= "Content-Transfer-Encoding: quoted-printable\n";
         $feed .= "Content-Type: text/plain\n";
         $feed .= "From: \"".MBOXCreator::qp_enc($from)."\"\n";
         $feed .= "Date: ".$itemDate->rfc822()."\n";
         $feed .= "Subject: ".MBOXCreator::qp_enc(FeedCreator::iTrunc($this->items[$i]->title,100))."\n";
         $feed .= "\n";
         $body  = chunk_split(MBOXCreator::qp_enc($this->items[$i]->description));
         $feed .= preg_replace("~\nFrom ([^\n]*)(\n?)~","\n>From $1$2\n",$body);
         $feed .= "\n";
         $feed .= "\n";
      }
      return $feed;
   }

   /**
    * Generate a filename for the feed cache file. Overridden from FeedCreator to prevent XML data types.
    * @return string the feed cache filename
    * @since 1.4
    * @access private
    */
   function _generateFilename() {
      $fileInfo = pathinfo($_SERVER['PHP_SELF']);
      return substr($fileInfo["basename"],0,-(strlen($fileInfo["extension"])+1)).".mbox";
   }
}

/**
* OPMLCreator is a FeedCreator that implements OPML 2.0.
* @see http://opml.scripting.com/spec
* @author Dirk Clemens, Kai Blankenhorn
*/
class OPMLCreator extends FeedCreator {
   public function __construct() {
      $this->encoding = 'UTF-8';
   }
   function createFeed() {
      $feed = '<?xml version="1.0" encoding="'.$this->encoding.'"?>'."\n";
      $feed .= $this->_createGeneratorComment();
      $feed .= '<opml version="2.0">'."\n";
      $feed .= '    <head>'."\n";
      $feed .= '        <title>'.htmlspecialchars($this->title,ENT_COMPAT|ENT_HTML401,$this->encoding).'</title>'."\n";
      if ($this->pubDate != '') {
         $date = new FeedDate($this->pubDate);
         $feed .= '         <dateCreated>'.$date->rfc822().'</dateCreated>'."\n";
      }
      if ($this->lastBuildDate != '') {
         $date = new FeedDate($this->lastBuildDate);
         $feed .= '         <dateModified>'.$date->rfc822().'</dateModified>'."\n";
      }
      if ($this->editor != '') 
         $feed .= '         <ownerName>'.$this->editor.'</ownerName>'."\n";
      if ($this->editorEmail != '') 
         $feed .= '         <ownerEmail>'.$this->editorEmail.'</ownerEmail>'."\n";
      $feed .= '    </head>'."\n";
      $feed .= '    <body>'."\n";
      for ($i=0;$i<count($this->items);$i++) {
         $feed .= "    <outline type=\"rss\" ";
         $title = htmlspecialchars(strip_tags(strtr($this->items[$i]->title,"\n\r","  ")),ENT_COMPAT|ENT_HTML401,$this->encoding);
         $feed .= " title=\"".$title."\"";
         $feed .= " text=\"".$title."\"";
         $feed .= " url=\"".htmlspecialchars($this->items[$i]->link,ENT_COMPAT|ENT_HTML401,$this->encoding)."\"";
         $feed .= "/>\n";
      }
      $feed .= '    </body>'."\n";
      $feed .= '</opml>'."\n";
      return $feed;
   }
}
?>