$array = array(
0=>array("","河北"),
1=>array("","北京"),
2=>array(0,"保定"),
3=>array(1,"海淀"),
4=>array(3,"中关村"),
5=>array(2,"涿州")
);
处理后返回如下：
河北
-保定
--涿州
北京
-海淀
--中关村
function typeArray($array){
$con = null;
foreach ($array as $k=>$v){
$na[$k] = is_numeric($v[0]) ? $na[$v[0]].$k."|" : $k."|";
}
asort($na); //排序
foreach ($na as $k=>$v){
$s = substr_count($v,"|");
$con .= str_repeat("-",($s-1)).$array[$k][1]."\n";
}
return $con;
}