PHP生成RSS类 (PHP类）

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PHP生成RSS类 (PHP类）

以下为引用的内容：

<?php

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

define("FEEDCREATOR_VERSION", "www.273.cn");

class FeedItem extends HtmlDescribable {
 
 var $title, $description, $link;
 
 
 var $author, $authorEmail, $image, $category, $comments, $guid, $source, $creator;
 
 
 var $date;
 
 
 var $additionalElements=Array();
 // on hold
 // var $source;
}
 

class FeedImage extends HtmlDescribable {
 
 var $title, $url, $link;
 
 
 var $width, $height, $description;
}
 

class HtmlDescribable {
 
 var $descriptionHtmlSyndicated;
 
 
 var $descriptionTruncSize;
 
 
 function getDescription() {
  $descriptionField=new FeedHtmlField($this->description);
  $descriptionField->syndicateHtml=$this->descriptionHtmlSyndicated;
  $descriptionField->truncSize=$this->descriptionTruncSize;
  return $descriptionField->output();
 }
}

class FeedHtmlField {
 
 var $rawFieldContent;
 
 
 var $truncSize, $syndicateHtml;
 
 
 function FeedHtmlField($parFieldContent) {
  if ($parFieldContent) {
   $this->rawFieldContent=$parFieldContent;
  }
 }
  
 
 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;
 }
}

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};
   }
  }
 }
 
 
 function createFeed($format="RSS0.91") {
  $this->_setFormat($format);
  return $this->_feed->createFeed();
 }
 
 
  
 function saveFeed($format="RSS0.91", $filename="", $displayContents=true) {
  $this->_setFormat($format);
  $this->_feed->saveFeed($filename, $displayContents);
 }

  
   function useCached($format="RSS0.91", $filename="", $timeout=3600) {
      $this->_setFormat($format);
      $this->_feed->useCached($filename, $timeout);
   }
}

class FeedCreator extends HtmlDescribable {
 
 var $title, $description, $link;
 
 
 
 var $syndicationURL, $image, $language, $copyright, $pubDate, $lastBuildDate, $editor, $editorEmail, $webmaster, $category, $docs, $ttl, $rating, $skipHours, $skipDays;
 
 var $xslStyleSheet="";
 
 
 
 var $items=Array();
 
 
 
 var $contentType="application/xml";
 
 
 
 var $encoding="utf-8";
 
 
 
 var $additionalElements=Array();
  
   
 
 function addItem($item) {
  $this->items[]=$item;
 }
 
  function clearItem2Null() {
  $this->items=array();
 }
 
 
 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)." ...";
  
 }
 
 
 
 function _createGeneratorComment() {
  return "<!-- generator=\"".FEEDCREATOR_VERSION."\" -->\n";
 }
 
 
 
 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) $xml .="<?xml-stylesheet href=http://www.chinaz.com/program/2008/1017/\"".$this->cssStyleSheet."\" _fcksavedurl="\"".$this->cssStyleSheet."\"" type=\"text/css\"?>\n";
  if ($this->xslStyleSheet) $xml .="<?xml-stylesheet href=http://www.chinaz.com/program/2008/1017/\"".$this->xslStyleSheet."\" type=\"text/xsl\"?>\n";
  return $xml;
 }
 
 
 
 function createFeed() {
 }
 
 
 function _generateFilename() {
  $fileInfo=pathinfo($_SERVER["PHP_SELF"]);
  return substr($fileInfo["basename"],0,-(strlen($fileInfo["extension"])+1)).".xml";
 }

以下为引用的内容：

 function _redirect($filename) {
  // attention, heavily-commented-out-area
 
  // maybe use this in addition to file time checking
  //Header("Expires: ".date("r",time()+$this->_timeout));
 
 
 
  // 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();
 }
   
 
 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);
  }
 }
 
 
 
 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 />";
  }
 }
 
}

 
class FeedDate {
 var $unix;
 
 
 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;
 }
 
 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;
 }
 
 
 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;
 }
 
 
 function unix() {
  return $this->unix;
 }
}

class RSSCreator10 extends FeedCreator {
 
 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;
 }
}
 

class RSSCreator091 extends FeedCreator {
 
 var $RSSVersion;
 function RSSCreator091() {
  $this->_setRSSVersion("0.91");
  $this->contentType="application/rss+xml";
 }
 
 
 function _setRSSVersion($version) {
  $this->RSSVersion=$version;
 }
 
 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";
   }
  
   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;
 }
}
 

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");

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