I tried inserting as serialize to multiple selected but when i want to retrieve those multi selected in the select box is not working
echo "<td class='tbl1' width='15%'>Format</td><td class='tbl1'><select name='format[]' multiple='multiple' class='textbox'>\n";
$sel = ($_POST['format'] == $data['format'] ? " selected='selected'" : "");
echo "<option value='".$data['format']."'$sel>".$data['format']."</option>\n";
echo "</select></td>\n";
echo "</tr>\n<tr>\n";