RSS Feeds selber erstellen  -  Die Klasse

<?php
 
/**
* Klasse zur Ausgabe des Contents aus der Datenbank
* @author Christian Blechert
* @since Juni 2008
*
*/
 
 
class rss_writer {
 
   private $chan_title;     // Channel Titel
   private $chan_desc;      // Channel Beschreibung
   private $chan_lang;      // Sprache
   private $chan_link;      // URL zu den Eintraegen
   private $rss_file_url;   // URL zum RSS Feed
 
   private $entrys;         // Eintraege als Array
 
 
   /**
    * Construct
    *
    * @param   String   $channel_title      Channel Titel
    * @param   String   $channel_desc       Beschreibung
    * @param   String   $channel_link       URL zu den Eintraegen
    * @param   String   $channel_language   Sprache
    * @param   String   $rss_file_url       URL zum RSS Feed
    */
   function __construct($channel_title, $channel_desc, $channel_link, $channel_language, $rss_file_url) {
 
      $this->chan_title   = $channel_title;
      $this->chan_desc    = $channel_desc;
      $this->chan_lang    = $channel_language;
      $this->chan_link    = $channel_link;
      $this->rss_file_url = $rss_file_url;
 
      $this->entrys = array();
 
   }
 
   /**
    * Bereitet einen String fuer das XML auf
    * @param   String   $string
    * @return String
    */
   function cleanElement($string) {
      $string = trim($string);
      $string = str_replace(array("\\n","\\r","\\r\\n"),"", $string);
      $string = html_entity_decode($string, ENT_QUOTES, 'UTF-8');
      $string = htmlspecialchars($string, ENT_QUOTES, 'UTF-8');
 
      return $string;
   }
 
   /**
    * Prueft einen URL auf richtige Syntax
    *
    * @param String $url Website Adresse
    * @return String URL
    * @return false
    */
   function checkUrl($url) {
      if(substr($url, 0, 7)!="http://" && substr($url, 0, 8)!="https://") {
         $url = "http://".$url;
      }
      $regex = "!^((ftp|(http(s)?))://)?(\\.?([a-z0-9-]+))+\\.[a-z]{2,6}(:[0-9]{1,5})?(/[a-zA-Z0-9.,;\\?|\\'+&%\\$#=~_-]+)*$!i";
 
      if(preg_match($regex, $url)) {
         return $url;
      } else {
         return false;
      }
   }
 
   /**
    * Einen Eintrag hinzufuegen
    *
    * @param   String   $title          Titel
    * @param   String   $desc           Text
    * @param   String   $pub_date       Erstelldatum
    * @param   String   $url            Link
    * @param   String   $author         Autor
    * @param   String   $author_email   Email Adresse Autor
    * @param   String   $guid           Einzigartiger Schluessel
    * @return unknown_type
    */
   function add_entry($title, $desc, $pub_date, $url, $author, $author_email, $guid) {
      $datetime = explode(" ", $pub_date);
      $date = explode("-", $datetime[0]);
      $time = explode(":", $datetime[1]);
      $timestamp = mktime  ($time[0], $time[1], $time[2], $date[1], $date[2], $date[0]);
 
      $this->entrys[] = array(
         "title" => $title,
         "description" => $desc,
         "date" => date("D, d M Y H:i:s O", $timestamp),
         "url" => $url,
         "author" => $author,
         "author_email" => $author_email,
         "guid" => $guid
      );
 
   }
 
 
   /**
    * Gibt den XML Code aus
    * @return String
    */
   function get_source() {
 
      $rss_source  = "<?xml version=\\"1.0\\" encoding=\\"UTF-8\\"?>\\n\\n" .
                     "<rss version=\\"2.0\\" xmlns:atom=\\"http://www.w3.org/2005/Atom\\">\\n\\n";
 
      $rss_source .= "   <channel>\\n";
      $rss_source .= "      <title>".$this->cleanElement($this->chan_title)."</title>\\n";
      $rss_source .= "      <link>".$this->chan_link."</link>\\n";
      $rss_source .= "      <description>".$this->cleanElement($this->chan_desc)."</description>\\n";
      $rss_source .= "      <language>".$this->chan_lang."</language>\\n";
      $rss_source .= "      <atom:link href=\\"".$this->rss_file_url."\\" rel=\\"self\\" type=\\"application/rss+xml\\" />\\n\\n";
 
      for($i=0; $i<count($this->entrys); $i++) {
         $rss_source .= "         <item>\\n";
         $rss_source .= "            <title>".$this->cleanElement($this->entrys[$i]['title'])."</title>\\n";
         $rss_source .= "            <description>".$this->cleanElement($this->entrys[$i]['description'])."</description>\\n";
         $rss_source .= "            <pubDate>".$this->entrys[$i]['date']."</pubDate>\\n";
         $rss_source .= "            <link>".$this->entrys[$i]['url']."</link>\\n";
         if(strlen($this->entrys[$i]['author_email'])>0 && strlen($this->entrys[$i]['author'])>0) {
            $rss_source .= "            <author>".$this->entrys[$i]['author_email']." (".$this->cleanElement($this->entrys[$i]['author']).")</author>\\n";
         }
         if($this->checkUrl($this->entrys[$i]['guid'])) {
            $rss_source .= "            <guid>".$this->entrys[$i]['guid']."</guid>\\n";
         } else {
            $rss_source .= "            <guid isPermaLink='false'>".$this->entrys[$i]['guid']."</guid>\\n";
         }
         $rss_source .= "         </item>\\n\\n";
      }
 
      $rss_source .= "   </channel>\\n";
      $rss_source .= "</rss>";
 
      return $rss_source;
 
   }
 
}
 
?>