<?php
 $reza=mysql_query("select city_id,city_name from city order by city_id");
                    while ($row=mysql_fetch_array($reza)){
                       $id1=$row["city_id"];
                      $id2=$row["city_name"];

                 echo "<option value=\"$id2\">$id2</option>";
                    }
mysql_close($con);
?>