php实现递归与无限分类的方法

"; $area = array( array('id'=>1,'area'=>'北京','pid'=>0),array('id'=>2,'area'=>'广西',array('id'=>3,'area'=>'广东',array('id'=>4,'area'=>'福建',array('id'=>11,'area'=>'朝阳区','pid'=>1),array('id'=>12,'area'=>'海淀区',array('id'=>21,'area'=>'南宁市','pid'=>2),array('id'=>45,'area'=>'福州市','pid'=>4),array('id'=>113,'area'=>'亚运村','pid'=>11),array('id'=>115,'area'=>'奥运村',array('id'=>234,'area'=>'武鸣县','pid'=>21) );

function t($arr,$pid=0,$lev=0){
static $list = array();
foreach($arr as $v){
if($v['pid']==$pid){
echo str_repeat("",$lev).$v['area']."
";
//这里输出，是为了看效果
$list[] = $v;
t($arr,$v['id'],$lev+1);
}
}
return $list;
}
$list = t($area);
echo "

---

";
print_r($list);
?>