• PHP生成RSS类
    时间:2009-01-11   作者:佚名   出处:互联网

    <?php
    /**
     * rss操作类
     *
     * FeedCreator class v1.7.2
     * originally (c) Kai Blankenhorn
     * www.bitfolge.de
     * kaib@bitfolge.de
     *
     */

    // your local timezone, set to "" to disable or for GMT
    define("TIME_ZONE","");

    /**
     * Version string.
     **/
    define("FEEDCREATOR_VERSION", "www.273.cn");

    /**
     * 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 "0.91":
                    // fall through
                case "RSS0.91":
                    $this->_feed = new RSSCreator091();
                    break;
               
                default:
                    $this->_feed = new RSSCreator091();
                    break;
            }
           
            $vars = get_object_vars($this);
            foreach ($vars as $key => $value) {
                // prevent overwriting of properties "contentType", "encoding"; do not copy "_feed" itself
                if (!in_array($key, array("_feed", "contentType", "encoding"))) {
                    $this->_feed->{$key} = $this->{$key};
                }
            }
        }
       
        /**
         * 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 = "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;
        }

        /**
         * 清空当前数组值
         *
         * @param object FeedItem $item The FeedItem to add to the feed.
         * @access public
         */
         function clearItem2Null() {
            $this->items = array();
        }   
       
        /**
         * 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.
         * 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("Y-m-d 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() {
            $date = gmdate("Y-m-d H:i:s",$this->unix);
            $date = substr($date,0,22) . ':' . substr($date,-2);
            if (TIME_ZONE!="") $date = str_replace("+00:00",TIME_ZONE,$date);
            return $date;
        }
       
        /**
         * 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;
        }

        /**
         * 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),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())."</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),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");
        }
       
    }

    ?>


    PHP生成RSS类

    使用:
    include_once('Rss.class.php');
    $rss = new UniversalFeedCreator();
    $rss->title = "PHP开源项目";
    $rss->link = "http://www.coderhome.net";
    $rss->description = "最全最新最丰富的PHP开源项目";
    $softList = $query->select('select * from soft_list where status=1 order by id desc','array',1,100);
    foreach ($softList as $rs) {
    $item = new FeedItem();
    $item->title = $rs['title'];
    $item->link = 'http://www.coderhome.net/?id='.$rs['id'];
    $item->description = $rs['content'];
    $rss->addItem($item);
    }
    $rss->saveFeed("RSS2.0", "rss.xml");

    网友留言/评论

    我要留言/评论