function showpdf($file , $show) { 
   $size = filesize($file); 
   header("Content-type: application/pdf"); 
   header("Content-disposition: attachment; filename=".$name); 
   header("Content-Length: ".$size); 
   header("Pragma: no-cache"); 
   header("Expires: 0"); 
   readfile($file); 
}
include "path.php";
include "umgvar.php";
$conn = ocilogon($db_user, $db_pass, $db_tns) or die("Fehler: Es konnte keine Verbindung zur Datenbank hergestellt werden.");
$req="SELECT * FROM \"tblPDF\" WHERE \"ID\"=".$PDFID;
$stmt=OCIParse($conn, $req);
OCIExecute($stmt);
OCIFetch($stmt);
$bdatalob=OCIResult($stmt, "AR_Objekt");
$bdata=$bdatalob->load();
OCI-Lob->close();
ocicloselob($bdatalob);
ocifreecollection($bdata);
ocifreedesc($bdatalob);
ocifreecursor($stmt);

ocilogoff();
$dateiname="tmppdf.pdf";
$fp=fopen($dateiname,"w");
flock ($fp,2);
fputs ($fp,$bdata);
fclose ($fp);
showpdf($dateiname,"rechnung.pdf");
unlink ($dateiname);