PHP dropdown with items from database -

i can't seem values of table in dropdownlist. no errors, empty dropdownlist. code:

<?php                include_once ("classes/keten.class.php"); $keten = new keten(); $allket = $keten->getallketens();  echo '<select name="fk_keten_id">';              while($row = mysql_fetch_array($allket)) {   echo '<option value="' .         $row['pk_keten_id'] . '">' . $row['keten_naam'] . '</option>'; } echo '</select>';  ?> 

function getallketens works, because use in other page.

thanks in advance :)

on request, getallket() function in classes/keten.class.php

public function getallketens()     {         include ("connection.php");         $ssql = "select * tblketens;";         $vresult = mysqli_query($link, $ssql);         mysqli_close($link);         return($vresult);     } 

i'm not sure mixing mysqli , mysql commands can done, in fetch_array used mysql_fetch_array instead of mysqli_fetch_array.