CREATE TABLE IF NOT EXISTS `city` (
 `id` int(11) NOT NULL auto_increment,
 `name` varchar(30) character set utf8 collate utf8_unicode_ci NOT NULL default '0',
 `parentId` int(11) NOT NULL default '0'
 PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=7 ;

$db=new DB($Config['host'],$Config['user'],$Config['password'],$Config['port'],$Config['db'],$Config['charset']);
function findCity($table,$id=0,$level=1){
 global $db;
 $findSql="select id,name,parentId from $table where parentId={$id} order by id";
 $findResult=$db->getArray($findSql);
 $num=$db->numRows;
 $logoStr="|";
 for($i=0;$i<$level;$i++){
 $logoStr.="--";
 }
  if($num!=0){
  for($j=0;$j<$num;$j++){
   echo "<option value={$findResult[$j]['id']}>{$logoStr}{$findResult[$j][name]}</option>";
    findCity($table,$findResult[$j]['id'],$level+1);
  }
 }
}
findCity(city);