php无限分类方法

$items = array(
    1 => array('id' => 1, 'pid' => 0, 'name' => '江西省'),
    2 => array('id' => 2, 'pid' => 0, 'name' => '黑龙江省'),
    3 => array('id' => 3, 'pid' => 1, 'name' => '南昌市'),
    4 => array('id' => 4, 'pid' => 2, 'name' => '哈尔滨市'),
    5 => array('id' => 5, 'pid' => 2, 'name' => '鸡西市'),
    6 => array('id' => 6, 'pid' => 4, 'name' => '香坊区'),
    7 => array('id' => 7, 'pid' => 4, 'name' => '南岗区'),
    8 => array('id' => 8, 'pid' => 6, 'name' => '和兴路'),
    9 => array('id' => 9, 'pid' => 7, 'name' => '西大直街'),
    10 => array('id' => 10, 'pid' => 8, 'name' => '东北林业大学'),
    11 => array('id' => 11, 'pid' => 9, 'name' => '哈尔滨工业大学'),
    12 => array('id' => 12, 'pid' => 8, 'name' => '哈尔滨师范大学'),
    13 => array('id' => 13, 'pid' => 1, 'name' => '赣州市'),
    14 => array('id' => 14, 'pid' => 13, 'name' => '赣县'),
    15 => array('id' => 15, 'pid' => 13, 'name' => '于都县'),
    16 => array('id' => 16, 'pid' => 14, 'name' => '茅店镇'),
    17 => array('id' => 17, 'pid' => 14, 'name' => '大田乡'),
    18 => array('id' => 18, 'pid' => 16, 'name' => '义源村'),
    19 => array('id' => 19, 'pid' => 16, 'name' => '上坝村'),
);

/*$conn=mysql_connect("127.0.0.1","root","root");
mysql_select_db("district",$conn);
$result=mysql_query("select * from ceshi");

$row=mysql_fetch_array($result);
print_r($row);*/

function getson($arr,$tid=0,$level){
    static $res;//静态变量 只会被初始化一次
    foreach($arr as $k=>$v){
        $ctid = intval($v['pid']);
        $cid = intval($v['id']);
        if($ctid===$tid){
            $tmp = $v;
            $tmp['levelsign'] = $level;
            $res[] = $tmp;
            getson($arr,$cid,$level+1);
        }
    }
    return $res;
}
//html构造方法
function levelhtml($level=0){
    $x=0;
    $html='';
    while($x<$level){
        $html='—'.$html;
        $x++;
    }
    return $x===0?$html:'|'.$html;
}


$_arr = getson($items,0,0);
$color = array(
    'c0'=>'#000000',
    'c1'=>'#336666',
    'c2'=>'purple',
    'c3'=>'green',
    'c4'=>'red',
    'c5'=>'blue',
);
foreach($_arr as $k=>$v){
    echo "<span style='color:".$color['c'.$v['levelsign']]."'>".levelhtml($v['levelsign']).$v['name'].'</span><br/>';
}
echo "<br/>";
echo "<select name='typeid'>";
foreach($_arr as $k=>$v){
    echo "<option style='color:".$color['c'.$v['levelsign']]."' value='".$v['id']."'>".levelhtml($v['levelsign']).$v['name']."</option>";
}
echo "</select>";