» Signaturgröße automatisch ermitteln und bei Bedarf ablehnen

// check image size 
if (stripos($this->value, '[/img') !== false) { 
   if (preg_match_all('#\](http.*?)\[/img#i', $this->value, $matches)) { 
      foreach ($matches[1] as $url) { 
         $url = @parse_url($url); 
         if ($fp = @fsockopen($url['host'], 80, $errno, $errstr, 5)) { 
            $data = ''; 
            fwrite($fp, "GET " . $url['path'] . ($url['query'] ? "?" . $url['query'] : '') . " HTTP/1.0\r\nHost: " . $url['host'] . "\r\n" . ($opts ? $opts . "\r\n" : '') . "Referer: http://" . $_SERVER['HTTP_HOST'] . "/\r\nConnection: close\r\n\r\n"); 
            while (!feof($fp)) { 
               $data .= fgets($fp); 
               // break if 20 kb have been reached 
               if (strlen($data) > 20480) { 
                  _error('Bilder in der Signatur dürfen maximal 20 kb groß sein!'); 
                  return; 
               } 
            } 
            fclose($fp); 
         } 
      } 
   } 
}

Mach mit!