<strong><span style="font-size:18px;">/*编号=年份后两位+月份+id四位数*/$id = $this->student_model->save(0, $data); $sn = date("Y", time()); $sn = substr($sn, -2); $sn.= date("m", time()); $sn.=sprintf("%04d", $id);</span></strong>