$ft = fopen($tmp_verzeichnis.$_FILES['datei']['name'],"r"); 
while($zeile = fread($ft,filesize($tmp_verzeichnis.$_FILES['datei']['name']))){ 
 
$daten .= $zeile; 
} 
 
fclose($ft); 

$senden = "bn=".$bn."&pw=".$pw."&empfaenger=".$_POST[empfaenger]."&abs_nr=".$_POST[abs_nr]."&abs_name=".$_POST[abs_name]."&datei=".base64_encode($daten); 
 
$ch = curl_init();  
curl_setopt($ch, CURLOPT_URL, "http://www.zielurl.de/inbound.php");  
curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);  
curl_setopt($ch, CURLOPT_POST, 1);  
curl_setopt($ch, CURLOPT_POSTFIELDS, $senden);  
$empfangen = curl_exec($ch);  
curl_close($ch); 

$datein = base64_decode($_POST[datei]); 
 
$datnam = "test.pdf"; 
 
$ft = fopen($datnam,"w"); 
fputs($ft,$datein); 
fclose($ft); 

$ft = fopen($tmp_verzeichnis."file.pdf","r"); 
       while($zeile = fread($ft,$file_size)){ 
         $daten .= $zeile; 
       } 
      fclose($ft); 
 
function urlsafe_b64encode($string) { 
   $data = base64_encode($string); 
   $data = str_replace(array('+','/','='),array('-','_',''),$data); 
   return $data; 
} 
 
$string = urlsafe_b64encode($daten); 

 
function urlsafe_b64decode($string) { 
   $data = str_replace(array('-','_'),array('+','/'),$string); 
   $mod4 = strlen($data) % 4; 
   if ($mod4) { 
       $data .= substr('====', $mod4); 
   } 
   return base64_decode($data); 
} 
 
$datnam = "test.pdf"; 
$ft = fopen($datnam,"w"); 
fputs($ft,urlsafe_b64decode($_POST[datei])); 
fclose($ft);