<?php

 echo "<select name='name'>";

 $query = mysql_query("SELECT class FROM lentele GROUP BY class");

while($row = mysql_fetch_array($query)){

echo "<optgroup label='{$row[class]}'>";

 

  $query2 = mysql_query("SELECT id,name FROM lentele WHERE class= '$row[class]' ");

           while($row2 = mysql_fetch_array($query2)){

                  echo "<option value='{$row2[id]}'>-- {$row2[name]}</option>";

            }

echo "</optgroup>";

 }

 

 echo "</select>";

?>