无限极分类引用版

function generateTree($data){
    $items = array();
    foreach($data as $v){
        $items[$v['auth_id']] = $v;
    }
    $tree = array();
    foreach($items as $k => $item){
        if(isset($items[$item['auth_pid']])){
            $items[$item['auth_pid']]['son'][] = &$items[$k];
        }else{
            $tree[] = &$items[$k];
        }
    }
    return $tree;
}