<?php
include "config.php";
include "MySQL.php";
$db = new Mysql('test'); //幾個簡單的類，不用列出來大家也看得懂。就是實例化一個數(shù)據(jù)庫連接而已。
function RootMenu ($PID,$n){
global $arr,$db;
$sql = "select * from menu where `PID` =$PID";
$result = $db->query($sql);
while ($i=$db->fetch_array($result)){
  $i["TITLE"] =str_repeat('--',$n).$i["TITLE"];
  $arr[] =$i;
  RootMenu($i["ID"],($n+4));
}
return $arr;
}
$arr = RootMenu(0,0);
?>
<select id="">
<option value="0" selected="selected">請選擇部門</option>
<?php
for ($i=0;$i<count($arr);$i++) {
?>
<option value="<?php echo $arr[$i]["ID"] ?>"><?php echo $arr[$i]["TITLE"] ?></option>
<?php }?>
</select>