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<?php
/***************************************************************************

FeedCreator class v1.7.2
originally (c) Kai Blankenhorn

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.

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, PIE0.1 (deprecated),
// MBOX, OPML, ATOM, ATOM0.3, HTML, JS
echo $rss->saveFeed("RSS1.0", "news/feed.xml");

// your local timezone, set to "" to disable or for GMT

/*
 * Version string.
 **/
define("FEEDCREATOR_VERSION", "Collabtive");
define("TIME_ZONE","+01:00");

/*
 * A FeedItem is a part of a FeedCreator feed.
 *
 * @author Kai Blankenhorn <kaib@bitfolge.de>
 * @since 1.3
 */
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();

// on hold
	// var $source;
}

/*
 * An FeedImage may be added to a FeedCreator feed.
 * @author Kai Blankenhorn <kaib@bitfolge.de>
 * @since 1.3
 */
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  $string: if given, sets the rawFieldContent property
	 */
	function FeedHtmlField($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),$this->truncSize);
			} else {
				$result = htmlspecialchars($this->rawFieldContent);
			}
		}
		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.
 *
 * @since 1.3
 * @author Kai Blankenhorn <kaib@bitfolge.de>
 */
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 "1.0":
				// fall through
			case "RSS1.0":
				$this->_feed = new RSSCreator10();
				break;

case "0.91":
				// fall through
			case "RSS0.91":
				$this->_feed = new RSSCreator091();
				break;

case "PIE0.1":
				$this->_feed = new PIECreator01();
				break;

case "MBOX":
				$this->_feed = new MBOXCreator();
				break;

case "OPML":
				$this->_feed = new OPMLCreator();
				break;

case "ATOM":
				// fall through: always the latest ATOM version

case "ATOM0.3":
				$this->_feed = new AtomCreator03();
				break;

case "HTML":
				$this->_feed = new HTMLCreator();
				break;

case "JS":
				// fall through
			case "JAVASCRIPT":
				$this->_feed = new JSCreator();
				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};
			}
		}
	}

/*
	 * Creates a syndication feed based on the items previously added.
	 *
	 * @see        FeedCreator::addItem()
	 * @param    string    format    format the feed should comply to. Valid values are:
	 *			"PIE0.1", "mbox", "RSS0.91", "RSS1.0", "RSS2.0", "OPML", "ATOM0.3", "HTML", "JS"
	 * @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.
	 * @since 1.4
	 *
	 * @param	string	format	format the feed should comply to. Valid values are:
	 *			"PIE0.1" (deprecated), "mbox", "RSS0.91", "RSS1.0", "RSS2.0", "OPML", "ATOM", "ATOM0.3", "HTML", "JS"
	 * @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   string   format   format the feed should comply to. Valid values are:
    *       "PIE0.1" (deprecated), "mbox", "RSS0.91", "RSS1.0", "RSS2.0", "OPML", "ATOM0.3".
    * @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>
 * @since 1.4
 */
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 stylesheet used to format the naked rss feed.
	* Ignored in the output when empty.
	*/
	var $xslStyleSheet = "";

/*
	 * @access private
	 */
	var $items = Array();

/*
	 * This feed's MIME content type.
	 * @since 1.4
	 * @access private
	 */
	var $contentType = "application/xml";

/*
	 * This feed's character encoding.
	 * @since 1.6.1
	 **/
	//var $encoding = "ISO-8859-1";
	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 "\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() {
		$xml = "";
		if (isset($this->cssStyleSheet)) $xml .= "<?xml-stylesheet href=\"".$this->cssStyleSheet."\" type=\"text/css\"?>\n";
		if (isset($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.
	 * For example:
	 *
	 * echo $_SERVER["PHP_SELF"]."\n";
	 * echo FeedCreator::_generateFilename();
	 *
	 * would produce:
	 *
	 * /rss/latestnews.php
	 * latestnews.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) {
		// attention, heavily-commented-out-area

// maybe use this in addition to file time checking
		//Header("Expires: ".date("r",time()+$this->_timeout));

/* no caching at all, doesn't seem to work as good:
		Header("Cache-Control: no-cache");
		Header("Pragma: no-cache");
		*/

// HTTP redirect, some feed readers' simple HTTP implementations don't follow it
		//Header("Location: ".$filename);

Header("Content-Type: ".$this->contentType."; charset=".$this->encoding."; 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) {
		$this->_timeout = $timeout;
		if ($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>Error creating feed file, please check write permissions.</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.
 */
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 $dateString optional the date this FeedDate will represent. If not specified, the current date and time is used.
	 */
	function FeedDate($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,"Jun"=>6,"Jul"=>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") - $ord - 1) * $oneHour;
					} elseif ($ord >= ord("M") AND $matches[7]!="Z") {
						$tzOffset = ($ord - 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) * 60 + substr($matches[7],-2)) * 60;
			} else {
				if ($matches[7]=="Z") {
					$tzOffset = 0;
				}
			}
			$this->unix += $tzOffset;
			return;
		}
		$this->unix = 0;
	}

/*
	 * Gets the date stored in this FeedDate as an RFC 822 date.
	 *
	 * @return a date in RFC 822 format
	 */
	function rfc822() {
		//return gmdate("r",$this->unix);
		$date = gmdate("D, d M Y H:i:s", $this->unix);
		if (TIME_ZONE!="") $date .= " ".str_replace(":","",TIME_ZONE);
		return $date;
	}

/*
	 * Gets the date stored in this FeedDate as an ISO 8601 date.
	 *
	 * @return a date in ISO 8601 format
	 */
	function iso8601() {
		$date = gmdate("Y-m-d\TH:i:sO",$this->unix);
		$date = substr($date,0,22) . ':' . substr($date,-2);
		if (TIME_ZONE!="") $date = str_replace("+00:00",TIME_ZONE,$date);
		return $date;
	}

/*
	 * 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.= $this->_createGeneratorComment();
		if ($this->cssStyleSheet=="") {
			$cssStyleSheet = "http://www.w3.org/2000/08/w3c-synd/style.css";
		}
		$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";
		}
		$now = new FeedDate();
		$feed.= "       <dc:date>".htmlspecialchars($now->iso8601())."</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)."\"/>\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[$i]->link)."\">\n";
			//$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";
			}
			if ($this->items[$i]->source!="") {
				$feed.= "        <dc:source>".htmlspecialchars($this->items[$i]->source)."</dc:source>\n";
			}
			if ($this->items[$i]->author!="") {
				$feed.= "        <dc:creator>".htmlspecialchars($this->items[$i]->author)."</dc:creator>\n";
			}
			$feed.= "        <title>".htmlspecialchars(strip_tags(strtr($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";
		}
		$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
 * @since 1.3
 * @author Kai Blankenhorn <kaib@bitfolge.de>
 */
class RSSCreator091 extends FeedCreator {

/*
	 * Stores this RSS feed's version number.
	 * @access private
	 */
	var $RSSVersion;

function RSSCreator091() {
		$this->_setRSSVersion("0.91");
		$this->contentType = "application/rss+xml";
	}

/*
	 * Sets this RSS feed's version number.
	 * @access private
	 */
	function _setRSSVersion($version) {
		$this->RSSVersion = $version;
	}

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";
			}
			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),100)."</copyright>\n";
		}
		if ($this->editor!="") {
			$feed.= "        <managingEditor>".FeedCreator::iTrunc(htmlspecialchars($this->editor),100)."</managingEditor>\n";
		}
		if ($this->webmaster!="") {
			$feed.= "        <webMaster>".FeedCreator::iTrunc(htmlspecialchars($this->webmaster),100)."</webMaster>\n";
		}
		if ($this->pubDate!="") {
			$pubDate = new FeedDate($this->pubDate);
			$feed.= "        <pubDate>".htmlspecialchars($pubDate->rfc822())."</pubDate>\n";
		}
		if ($this->category!="") {
			$feed.= "        <category>".htmlspecialchars($this->category)."</category>\n";
		}
		if ($this->docs!="") {
			$feed.= "        <docs>".FeedCreator::iTrunc(htmlspecialchars($this->docs),500)."</docs>\n";
		}
		if ($this->ttl!="") {
			$feed.= "        <ttl>".htmlspecialchars($this->ttl)."</ttl>\n";
		}
		if ($this->rating!="") {
			$feed.= "        <rating>".FeedCreator::iTrunc(htmlspecialchars($this->rating),500)."</rating>\n";
		}
		if ($this->skipHours!="") {
			$feed.= "        <skipHours>".htmlspecialchars($this->skipHours)."</skipHours>\n";
		}
		if ($this->skipDays!="") {
			$feed.= "        <skipDays>".htmlspecialchars($this->skipDays)."</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)),100)."</title>\n";
			$feed.= "            <link>".htmlspecialchars($this->items[$i]->link)."</link>\n";
			$feed.= "            <description>".$this->items[$i]->getDescription()."</description>\n";

if ($this->items[$i]->author!="") {
				$feed.= "            <author>".htmlspecialchars($this->items[$i]->author)."</author>\n";
			}
			/*
			// on hold
			if ($this->items[$i]->source!="") {
					$feed.= "            <source>".htmlspecialchars($this->items[$i]->source)."</source>\n";
			}
			*/
			if ($this->items[$i]->category!="") {
				$feed.= "            <category>".htmlspecialchars($this->items[$i]->category)."</category>\n";
			}
			if ($this->items[$i]->comments!="") {
				$feed.= "            <comments>".htmlspecialchars($this->items[$i]->comments)."</comments>\n";
			}
			if ($this->items[$i]->date!="") {
			$itemDate = new FeedDate($this->items[$i]->date);
				$feed.= "            <pubDate>".htmlspecialchars($itemDate->rfc822())."</pubDate>\n";
			}
			if ($this->items[$i]->guid!="") {
				$feed.= "            <guid>".htmlspecialchars($this->items[$i]->guid)."</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 {

function RSSCreator20() {
        parent::_setRSSVersion("2.0");
    }

}

/*
 * PIECreator01 is a FeedCreator that implements the emerging PIE specification,
 * as in http://intertwingly.net/wiki/pie/Syntax.
 *
 * @deprecated
 * @since 1.3
 * @author Scott Reynen <scott@randomchaos.com> and Kai Blankenhorn <kaib@bitfolge.de>
 */
class PIECreator01 extends FeedCreator {

function PIECreator01() {
		$this->encoding = "utf-8";
	}

/*
 * 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 {

function AtomCreator03() {
		$this->contentType = "application/atom+xml";
		$this->encoding = "utf-8";
	}

/*
 * MBOXCreator is a FeedCreator that implements the mbox format
 * as described in http://www.qmail.org/man/man5/mbox.html
 *
 * @since 1.3
 * @author Kai Blankenhorn <kaib@bitfolge.de>
 */
class MBOXCreator extends FeedCreator {

function MBOXCreator() {
		$this->contentType = "text/plain";
		$this->encoding = "ISO-8859-15";
	}

/*
	 * 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 1.0.
 *
 * @see http://opml.scripting.com/spec
 * @author Dirk Clemens, Kai Blankenhorn
 * @since 1.5
 */
class OPMLCreator extends FeedCreator {

function OPMLCreator() {
		$this->encoding = "utf-8";
	}

/*
 * HTMLCreator is a FeedCreator that writes an HTML feed file to a specific
 * location, overriding the createFeed method of the parent FeedCreator.
 * The HTML produced can be included over http by scripting languages, or serve
 * as the source for an IFrame.
 * All output by this class is embedded in <div></div> tags to enable formatting
 * using CSS.
 *
 * @author Pascal Van Hecke
 * @since 1.7
 */
class HTMLCreator extends FeedCreator {

var $contentType = "text/html";

/*
	 * Contains HTML to be output at the start of the feed's html representation.
	 */
	var $header;

/*
	 * Contains HTML to be output at the end of the feed's html representation.
	 */
	var $footer ;

/*
	 * Contains HTML to be output between entries. A separator is only used in
	 * case of multiple entries.
	 */
	var $separator;

/*
	 * Used to prefix the stylenames to make sure they are unique
	 * and do not clash with stylenames on the users' page.
	 */
	var $stylePrefix;

/*
	 * Determines whether the links open in a new window or not.
	 */
	var $openInNewWindow = true;

var $imageAlign ="right";

/*
	 * In case of very simple output you may want to get rid of the style tags,
	 * hence this variable.  There's no equivalent on item level, but of course you can
	 * add strings to it while iterating over the items ($this->stylelessOutput .= ...)
	 * and when it is non-empty, ONLY the styleless output is printed, the rest is ignored
	 * in the function createFeed().
	 */
	var $stylelessOutput ="";

/*
	 * Writes the HTML.
	 * @return    string    the scripts's complete text
	 */
	function createFeed() {
		// if there is styleless output, use the content of this variable and ignore the rest
		if ($this->stylelessOutput!="") {
			return $this->stylelessOutput;
		}

//if no stylePrefix is set, generate it yourself depending on the script name
		if ($this->stylePrefix=="") {
			$this->stylePrefix = str_replace(".", "_", $this->_generateFilename())."_";
		}

//set an openInNewWindow_token_to be inserted or not
		if ($this->openInNewWindow) {
			$targetInsert = " target='_blank'";
		}

// use this array to put the lines in and implode later with "document.write" javascript
		$feedArray = array();
		if ($this->image!=null) {
			$imageStr = "<a href='".$this->image->link."'".$targetInsert.">".
							"<img src='".$this->image->url."' border='0' alt='".
							FeedCreator::iTrunc(htmlspecialchars($this->image->title),100).
							"' align='".$this->imageAlign."' ";
			if ($this->image->width) {
				$imageStr .=" width='".$this->image->width. "' ";
			}
			if ($this->image->height) {
				$imageStr .=" height='".$this->image->height."' ";
			}
			$imageStr .="/></a>";
			$feedArray[] = $imageStr;
		}

if ($this->title) {
			$feedArray[] = "<div class='".$this->stylePrefix."title'><a href='".$this->link."' ".$targetInsert." class='".$this->stylePrefix."title'>".
				FeedCreator::iTrunc(htmlspecialchars($this->title),100)."</a></div>";
		}
		if ($this->getDescription()) {
			$feedArray[] = "<div class='".$this->stylePrefix."description'>".
				str_replace("]]>", "", str_replace("<![CDATA[", "", $this->getDescription())).
				"</div>";
		}

if ($this->header) {
			$feedArray[] = "<div class='".$this->stylePrefix."header'>".$this->header."</div>";
		}

for ($i=0;$i<count($this->items);$i++) {
			if ($this->separator and $i > 0) {
				$feedArray[] = "<div class='".$this->stylePrefix."separator'>".$this->separator."</div>";
			}

if ($this->items[$i]->title) {
				if ($this->items[$i]->link) {
					$feedArray[] =
						"<div class='".$this->stylePrefix."item_title'><a href='".$this->items[$i]->link."' class='".$this->stylePrefix.
						"item_title'".$targetInsert.">".FeedCreator::iTrunc(htmlspecialchars(strip_tags($this->items[$i]->title)),100).
						"</a></div>";
				} else {
					$feedArray[] =
						"<div class='".$this->stylePrefix."item_title'>".
						FeedCreator::iTrunc(htmlspecialchars(strip_tags($this->items[$i]->title)),100).
						"</div>";
				}
			}
			if ($this->items[$i]->getDescription()) {
				$feedArray[] =
				"<div class='".$this->stylePrefix."item_description'>".
					str_replace("]]>", "", str_replace("<![CDATA[", "", $this->items[$i]->getDescription())).
					"</div>";
			}
		}
		if ($this->footer) {
			$feedArray[] = "<div class='".$this->stylePrefix."footer'>".$this->footer."</div>";
		}

$feed= "".join($feedArray, "\r\n");
		return $feed;
	}

/*
	 * Overrrides parent to produce .html extensions
	 *
	 * @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)).".html";
	}
}

/*
 * JSCreator is a class that writes a js file to a specific
 * location, overriding the createFeed method of the parent HTMLCreator.
 *
 * @author Pascal Van Hecke
 */
class JSCreator extends HTMLCreator {
	var $contentType = "text/javascript";

/*
	 * writes the javascript
	 * @return    string    the scripts's complete text
	 */
	function createFeed()
	{
		$feed = parent::createFeed();
		$feedArray = explode("\n",$feed);

$jsFeed = "";
		foreach ($feedArray as $value) {
			$jsFeed .= "document.write('".trim(addslashes($value))."');\n";
		}
		return $jsFeed;
	}

/*
	 * Overrrides parent to produce .js extensions
	 *
	 * @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)).".js";
	}

}
?>