tp5模型事件回调函数中不能使用$this

public static function init(){

        self::event(‘before_delete‘, function ($data) {

            $sonids=self::getid($data[‘cate_id‘]);
            Db::table(‘sp_cate‘)->where([‘cate_id‘=>$sonids])->delete();

        });
    }


//获取下级分类id
    static public function getid($pid){
        static $ids=array();
        $res= Db::table(‘sp_cate‘)->where(‘cate_pid‘,$pid)->field(‘cate_id‘)->select();
        if($res!=null){
            foreach ($res as $v){
                if($v!=‘‘){
                    $ids[]=$v[‘cate_id‘];
                    self::getid($v[‘cate_id‘]);
                }

            }
        }
        return $ids;


    }