Physical rollback in php

//向该表同时添加3条数据
    public function addThree($param)
    {
        $this->mod->startTrans();
        //生成更新条件和数据
       
        
        $res1=$this->addOne($add_data7);
        $res2=$this->addOne($add_data14);
        $res3=$this->addOne($add_data28);
        
         if($res1&&$res2&&$res3){
            $this->mod->commit();
            return true;
        }else{
            $this->mod->rollback();
            return false;
        }
        
    }