Criar lista suspensa do valor no banco de dados php

    <?php 
    echo '<select name="cosupervisor">'; 
      while($row3 = oci_fetch_array($sql3,OCI_ASSOC+OCI_RETURN_NULLS))
    {
        $data[] = $row3 ;                         
    } 

     foreach($data as $value)
        {
              echo '<option value="'.$value['STFNAME'].'">'.$value['STFNAME'].'</option>';                          } 
        echo '</select>'; ?>
    </td> 

   ?>
</td>