public function unlimitedForLevel($cate, $name = 'child', $pid = 0) {
$arr = array();
foreach ($cate as $key => $v) {
//判断，如果$v['pid'] == $pid的则压入数组Child
if ($v['pid'] == $pid) {
//递归执行
$v[$name] = self::unlimitedForLevel($cate, $name, $v['id']);
$arr[] = $v;
}
}
return $arr;
}