header("Expires: 0");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", false);
header("Pragma: no-cache");
header("Content-type: application/pdf");

              pg_exec($dbh, "BEGIN");
               $ofp = pg_lo_open($data[14], "r");
               if      (!$ofp)
               {
                       echo "cannot open BLOB<br>\n";
                }
               $img = pg_lo_read_all($ofp);
               print $img;
                pg_lo_close($ofp);
                pg_exec($dbh, "END");
        }