一个牛逼的PHP无限极分类

$res=DB::table("goods_type")->get();
$id=0;
foreach($res as $key => $val){
$id++;
$dd[$id]=get_object_vars($val);
}
$a=$this->anyGenerateTree($dd);

function anyGenerateTree($items){
$tree = array();
foreach($items as $item){
if(isset($items[$item['f_id']])){
$items[$item['f_id']]['son'][] = &$items[$item['t_id']];
}else{
$tree[] = &$items[$item['t_id']];
}
}
return $tree;
}