title: How can I get the recent tweets than last time checked?
body: <p>I am using PHP and tweeter RSS to parse the tweets and trying to store the tweets in the database. </p>
  
  <p>Is there any way, I can get/parse only the recent tweets than the last time parsed OR checked?  because every now and then there may be tweets updates on tweeter RSS. </p>
  
  <pre><code>function fetch_rss_tweets($username, $maxtweets) {
   //Using simplexml to load URL
   $tweets = simplexml_load_file("http://twitter.com/statuses/user_timeline/" . $username . ".rss");
  
  
   $tweet_array = array();  //Initialize empty array to store tweets
   foreach ( $tweets-&gt;channel-&gt;item as $tweet ) { 
  
      /*  print '&lt;pre&gt;';
          print_r ($tweet);
          print '&lt;/pre&gt;';*/
  
        //Loop to limitate nr of tweets.
        if ($maxtweets == 0) {
             break;
        } else {
             $twit = $tweet-&gt;description;  //Fetch the tweet itself
  
             //Remove the preceding 'username: '
             $twit = substr(strstr($twit, ': '), 2, strlen($twit));
  
             // Convert URLs into hyperlinks
           //  $twit = preg_replace("/(http:\/\/)(.*?)\/([\w\.\/\&amp;\=\?\-\,\:\;\#\_\~\%\+]*)/", "&lt;a href=\"\\0\"&gt;\\0&lt;/a&gt;", $twit);
  
             // Convert usernames (@) into links 
             $twit = preg_replace("(@([a-zA-Z0-9\_]+))", "&lt;a href=\"http://www.twitter.com/\\1\"&gt;\\0&lt;/a&gt;", $twit);
  
             // Convert hash tags (#) to links 
             $twit = preg_replace('/(^|\s)#(\w+)/', '\1&lt;a href="http://search.twitter.com/search?q=%23\2"&gt;#\2&lt;/a&gt;', $twit);
  
             //Specifically for non-English tweets, converts UTF-8 into ISO-8859-1
             $twit = iconv("UTF-8", "ISO-8859-1//TRANSLIT", $twit);
  
  
             //Store tweet and time into the array
             $tweet_item = array(
                   'desc' =&gt; $twit,                                        
             );
             array_push($tweet_array, $tweet_item);
  
             $maxtweets--;
        }
   }
   //Return array
   return $tweet_array;
  </code></pre>
  
  <p>}</p>