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<?php
   $daten = "besucher.txt";
   $time  = time();
   $ip    = getenv("REMOTE_ADDR");
   $ablaufzeit = $time - "300";
   $pruefung   = @file($daten);

   while (list ($line_num, $line) = @each ($pruefung)) {
      $zeiten = explode("&&",$line);
      if($zeiten[0] <= $ablaufzeit) {
         $fp = fopen( "$daten", "r" );
         $contents = fread($fp, filesize($daten));
         fclose($fp);
         $line=quotemeta($line);
         $string2 = "";
         $replace = ereg_replace($line, $string2, $contents);
         $fh=fopen($daten, "w");
         @flock($fp,2);
         fputs($fh, $replace);
         @flock($fp,3);
         fclose($fh);
      }
   }
   $ippruefung = @file($daten);
   while (list ($line_num, $line) = @each ($ippruefung)) {
      $ips = explode("&&",$line);
      if($ips[1] == $ip) {
         $fp = fopen( "$daten", "r" );
         $contents = fread($fp, filesize($daten));
         fclose($fp);
         $line=quotemeta($line);
         $string2 = "";
         $replace = ereg_replace($line, $string2, $contents);
         $fh=fopen($daten, "w");
         @flock($fp,2);
         fputs($fh, $replace);
         @flock($fp,3);
         fclose($fh);
      }
   }
   $fp = fopen("$daten", "a+");
   flock($fp,2);
   fputs ($fp, "$time&&$ip&&\n");
   flock($fp,3);
   fclose ($fp);
   $anzahldaten = file($daten);
   $anzahl = count($anzahldaten);
   echo $anzahl." User online";
?>