PHP生成RSS聚合内容实例

PHP生成RSS聚合内容实例


最近YOOZHAN优站正在做一个新闻程序，客户要求站内要能一键自动生成RSS文件，方便用户定阅和自己用采集工具发布到更多的网站。其实这个功能已经不是新鲜事情了，网上一搜索一大堆，但是实际上做起来，没有经验还真是费时间，小编我确实花了几个小时，不怕大神吐槽，呵呵。


其实已经是有现成的PHP类可以用的，只是自己没有找到而以。这里要说一句，不是没找到，而是很多朋友为了推广，把这个类已经替换成他自己的信息，比如网址啦，数据库之类的，不仔细看直接拿来用是根本不可能的，所以还是要花点心思看一看，为了不让更多的人苦恼，我今天把自己的已经生成成功的案例放出，并作详细使用说明，希望大家不要走弯路了，好了，以下是重点。


为了养成良好的编程习惯，我们讲具体些，这个功能就两个文件，一个是rss.class.php类库，一个是demo.php测试文件。以下是代码：


/**
* demo.php文件内容开始
* auth:www.yoozhan.com
* date:2012-12-06
*
**/
//加载RSS类库，放于lib文件夹里，便于管理
include_once('lib/rss.class.php'); 


//加载数据库连接文件
include_once('lib/conn.inc.php'); 


//初始化RSS操作类
$rss = new UniversalFeedCreator(); 


//初始化版权信息
$rss->title = "PHP开源项目之RSS"; 
$rss->link = "http://www.yoozhan.com";
$rss->description = "YOOZHAN优站为需要做好网站的朋友提供网站优化,网站推广,seo培训服务！"; 


//这里看自己的情况使用，如果是模板可以参考此句
//$softList = $query->select('select * from soft_list where status=1 order by id desc','array',1,100);


//正常的数据库操作语句
$sql= "select * from product order by id desc limit 15";
/**
*
* 说明：这里的product字段，是我的数据库里的产品信息，实际使用请换为自己的数据库（如news）！
* auth: YOOZHAN优站 www.yoozhan.com
* date:2012-12-06
*
**/
$p_sql = mysql_query($sql);
while($r_sql = mysql_fetch_assoc($p_sql)){
$item = new FeedItem(); 
$item->title = $r_sql['title']; 
$item->link = 'http://www.yoozhan.com/news/news-'.$r_sql['id'].'.html'; 
$item->description = $r_sql['title']; 
$rss->addItem($item);
}


//将生成的XML文件保存在当前目录
$rss->saveFeed("RSS2.0", "rss.xml");
?>


华丽的分割线


/**
* demo.php文件内容开始
* auth:www.yoozhan.com
* date:2012-12-06
*
**/
/**
 * rss操作类
 *
 * FeedCreator class v1.7.2
 * originally (c) Kai Blankenhorn
 * www.bitfolge.de
 * [email protected]
 *
 */
// your local timezone, set to "" to disable or for GMT
define("TIME_ZONE","");
/**
 * Version string.
 **/
define("FEEDCREATOR_VERSION", "www.yoozhan.com");
/**
 * A FeedItem is a part of a FeedCreator feed.
 *
 * @author Kai Blankenhorn
 * @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
  * 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
 * @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
 * @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) {
   $result = "rawFieldContent."]]>";
  } else {
   if ($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
 */
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
 * @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
  * 编码需要在这里修改，否则生成的是乱码
  * auth:liukangyong
  **/
 var $encoding = "gb-2312";
 
 
 /**
  * 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
  * 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 "\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\n";
   }
  }
  return $ae;
 }
 
 function _createStylesheetReferences() {
  $xml = "";
  if ($this->cssStyleSheet) {
  $xml .= "cssStyleSheet."'_fcksavedurl='".$this->cssStyleSheet."'type=\"text/css\"?>\n";
  }
  if ($this->xslStyleSheet)
{  
  $xml .= "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 "
Error creating feed file, please check write permissions.
";
  }
 }
 
}
 /**
 * 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_default_timezone_set('Asia/Chongqing'); //系统时间差8小时，这里要设定为东八区，北京时间


  $now = getdate(time());
  $cur_wday=$now['wday'];
  $date = date("Y-m-d H:i:s $cweekday[$cur_wday]"); 
  
  //$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
 */
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 = "encoding."\"?>\n";
  $feed.= $this->_createGeneratorComment();
  if ($this->cssStyleSheet=="") {
   $cssStyleSheet = "http://www.w3.org/2000/08/w3c-synd/style.css";
  }
  $feed.= $this->_createStylesheetReferences();
  $feed.= "   $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.= "    syndicationURL."\">\n";
  $feed.= "        \n";
  $feed.= "        ".htmlspecialchars($this->description)."\n";
  $feed.= "        ".$this->link."\n";
  if ($this->image!=null) {
   $feed.= "        image->url."\" />\n";
  }
  $now = new FeedDate();
  $feed.= "       ".htmlspecialchars($now->iso8601())."\n";
  $feed.= "        \n";
  $feed.= "            \n";
  for ($i=0;$iitems);$i++) {
   $feed.= "                items[$i]->link)."\"/>\n";
  }
  $feed.= "            \n";
  $feed.= "        \n";
  $feed.= "    \n";
  if ($this->image!=null) {
   $feed.= "    image->url."\">\n";
   $feed.= "        \n";
   $feed.= "        ".$this->image->link."\n";
   $feed.= "        ".$this->image->url."\n";
   $feed.= "    \n";
  }
  $feed.= $this->_createAdditionalElements($this->additionalElements, "    ");
  
  for ($i=0;$iitems);$i++) {
   $feed.= "    items[$i]->link)."\">\n";
   //$feed.= "        Posting\n";
   $feed.= "        text/html\n";
   if ($this->items[$i]->date!=null) {
    $itemDate = new FeedDate($this->items[$i]->date);
    $feed.= "        ".htmlspecialchars($itemDate->iso8601())."\n";
   }
   if ($this->items[$i]->source!="") {
    $feed.= "        ".htmlspecialchars($this->items[$i]->source)."\n";
   }
   if ($this->items[$i]->author!="") {
    $feed.= "        ".htmlspecialchars($this->items[$i]->author)."\n";
   }
   $feed.= "        \n";
   $feed.= "        ".htmlspecialchars($this->items[$i]->link)."\n";
   $feed.= "        ".htmlspecialchars($this->items[$i]->description)."\n";
   $feed.= $this->_createAdditionalElements($this->items[$i]->additionalElements, "        ");
   $feed.= "    \n";
  }
  $feed.= "\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
 */
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 = "encoding."\"?>\n";
  $feed.= $this->_createGeneratorComment();
  $feed.= $this->_createStylesheetReferences();
  $feed.= "RSSVersion."\">\n"; 
  $feed.= "    \n";
  $feed.= "        \n";
  $this->descriptionTruncSize = 500;
  $feed.= "        ".$this->getDescription()."\n";
  $feed.= "        ".$this->link."\n";
  $now = new FeedDate();
  $feed.= "        ".htmlspecialchars($now->rfc822())."\n";
  $feed.= "        ".FEEDCREATOR_VERSION."\n";
  if ($this->image!=null) {
   $feed.= "        \n";
   $feed.= "            ".$this->image->url."\n"; 
   $feed.= "            \n"; 
   $feed.= "            ".$this->image->link."\n";
   if ($this->image->width!="") {
    $feed.= "            ".$this->image->width."\n";
   }
   if ($this->image->height!="") {
    $feed.= "            ".$this->image->height."\n";
   }
   if ($this->image->description!="") {
    $feed.= "            ".$this->image->getDescription()."\n";
   }
   $feed.= "        \n";
  }
  if ($this->language!="") {
   $feed.= "        ".$this->language."\n";
  }
  if ($this->copyright!="") {
   $feed.= "        ".FeedCreator::iTrunc(htmlspecialchars($this->copyright),100)."\n";
  }
  if ($this->editor!="") {
   $feed.= "        ".FeedCreator::iTrunc(htmlspecialchars($this->editor),100)."\n";
  }
  if ($this->webmaster!="") {
   $feed.= "        ".FeedCreator::iTrunc(htmlspecialchars($this->webmaster),100)."\n";
  }
  if ($this->pubDate!="") {
   $pubDate = new FeedDate($this->pubDate);
   $feed.= "        ".htmlspecialchars($pubDate->rfc822())."\n";
  }
  if ($this->category!="") {
   $feed.= "        ".htmlspecialchars($this->category)."\n";
  }
  if ($this->docs!="") {
   $feed.= "        ".FeedCreator::iTrunc(htmlspecialchars($this->docs),500)."\n";
  }
  if ($this->ttl!="") {
   $feed.= "        ".htmlspecialchars($this->ttl)."\n";
  }
  if ($this->rating!="") {
   $feed.= "        ".FeedCreator::iTrunc(htmlspecialchars($this->rating),500)."\n";
  }
  if ($this->skipHours!="") {
   $feed.= "        ".htmlspecialchars($this->skipHours)."\n";
  }
  if ($this->skipDays!="") {
   $feed.= "        ".htmlspecialchars($this->skipDays)."\n";
  }
  $feed.= $this->_createAdditionalElements($this->additionalElements, "    ");
  for ($i=0;$iitems);$i++) {
   $feed.= "        \n";
   $feed.= "            \n";
   $feed.= "            ".htmlspecialchars($this->items[$i]->link)."\n";
   $feed.= "            ".$this->items[$i]->getDescription()."\n";
   
   if ($this->items[$i]->author!="") {
    $feed.= "            ".htmlspecialchars($this->items[$i]->author)."\n";
   }
   /*
   // on hold
   if ($this->items[$i]->source!="") {
     $feed.= "            ".htmlspecialchars($this->items[$i]->source)."\n";
   }
   */
   if ($this->items[$i]->category!="") {
    $feed.= "            ".htmlspecialchars($this->items[$i]->category)."\n";
   }
   if ($this->items[$i]->comments!="") {
    $feed.= "            ".htmlspecialchars($this->items[$i]->comments)."\n";
   }
   if ($this->items[$i]->date!="") {
   $itemDate = new FeedDate($this->items[$i]->date);
    $feed.= "            ".htmlspecialchars($itemDate->rfc822())."\n";
   }
   if ($this->items[$i]->guid!="") {
    $feed.= "            ".htmlspecialchars($this->items[$i]->guid)."\n";
   }
   $feed.= $this->_createAdditionalElements($this->items[$i]->additionalElements, "        ");
   $feed.= "        \n";
  }
  $feed.= "    \n";
  $feed.= "\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 */
class RSSCreator20 extends RSSCreator091 {
    function RSSCreator20() {
        parent::_setRSSVersion("2.0");
    }
    
}
?>

以上就是案例的完整代码了，成功生成后会在根目录有一个rss.xml文件，没错，要的就是它了，心情享受吧。这里要说明一下，在类库中有两个地方要修改的，一个是编码部分（我在里面有说明的，此文件是GB-2312的，需要utf-8的朋友自己改过），一个地方是时区部分（我已经改为东八区了，什么，你在国外……没办法，自己改回去吧），文件运行后会出现一个错误，说是在第5行的第6列，笔者没仔细看，不过RSS文件已经生成，就不管它了，高手自己修改下呵。本文由YOOZHAN优站 www.yoozhan.com 为茶叶礼盒 www.fyzg9888.com 推广制作，转载请务必保留文中链接，谢谢合作！