Problem displaying TIMESTAMP type from Oracle database

[oraphp]

I am writing a php script that queries an Oracle 9i database and I cannot extract any columns that are of type TIMESTAMP.

This is my database:

Name                                      Null?    Type
 ----------------------------------------- -------- ----------------------------
 MEDNO                                  NOT NULL NUMBER(7)
VISIT_DATE_TIME                   NOT NULL TIMESTAMP(6)

This is my php code:

 $stmt = OCIParse($conn, $sql);

  $result = OCIExecute($stmt, OCI_DEFAULT);

  // get the information of columns and rows
  $ncols = OCINumCols($stmt);
  $nrows = OCIFetchStatement($stmt, $result);

 print "<P><TABLE CELLSPACING=\"0\" CELLPADDING=\"3\" BORDER=\"1\" ALIGN=\"center\" width=\"100%\">\n";

  print "<TR bgcolor = #105F88>";

   while ( list( $key, $val ) = each( $result ) ) {

  print "<Td>$key</Td>\n";
   }

  print "</TR>\n";

  // print the data
  for ($j=0; $j<$nrows; $j++) {
                reset($result);
                print "<TR>";

            //loop through result
            while ($column = each($result)) {
                    $data = $column['value'];  
                    print "<TD>$data[$j]&nbsp;</TD>\n";
            }

            print "</TR>\n";
  }
  print "</TABLE>";

Please let me know if there is something that I am doing wrong. Thanks.