excel 导入， 上传文件必须为csv格式的文件，然后读取上传的文件，转换数组，存数据库就好了
下面最后的 $updata 就是最后处理好的数组，然后存数据库。

//车辆excel导入
    public function files_car(){
        if($_FILES['file']['error'] == 0){
            $type = trim($_FILES['file']['type']);
            if($type != 'application/vnd.ms-excel'){
                echo "<script>alert('只能导入csv文件类型！')</script>";die;
            }
            if($_FILES['file']['size'] <= 5000000){
                $name = $_FILES['file']['name'];
                $name_arr = explode('.', $name);
                $new_name = time().uniqid().'.'.$name_arr[count($name_arr)-1];
                $path = 'upload/excel/'.date('Y',time()).date('m',time()).date('d',time());
                $new_path = $path.'/'.$new_name;

                if(!is_dir($path)){
                    mkdir($path,0777,true);
                }
                if(move_uploaded_file($_FILES['file']['tmp_name'],$new_path)){
                    ob_end_clean();
                    $temp=file($new_path);
                    $data = eval('return '.iconv('gbk','utf-8',var_export($temp,true)).';');
                    for($i=0;$i <count($data);$i++){
                        if($i == 0){
                            $keyarr = explode(',',$data[0]);
                            foreach($keyarr as $v){
                                if($v == '车主姓名'){
                                    $v = 'username';
                                }elseif($v == '车牌号'){
                                    $v = 'car_number';
                                }elseif($v == '续保时间'){
                                    $v = 'car_baotime';
                                }elseif($v == '到期提醒'){
                                    $v = 'car_remind';
                                }elseif($v == '续保费用'){
                                    $v = 'money';
                                }else{
                                    $v = 'content';
                                }
                                
                                $keydata[] = $v;
                            }
                            $keydata[] = 'add_time';
                        }
                        if($i > 0){
                            $daan = explode(',', $data[$i]);
                            for($j=0;$j<count($keydata);$j++){
                                if($keydata[$j] == 'car_remind'){
                                    $daan[$j] = strtotime($daan[$j]);
                                }
                                if($keydata[$j] == 'add_time'){
                                    $daan[$j] = time();
                                }
                                $uparr[$keydata[$j]] = $daan[$j];
                            }
                            if($uparr['username'] != ''){
                                $updata[] = $uparr;
                            }
                        }
                    }
                    foreach($updata as $v){
                        if($v['username'] != ''){
                            $add = db('car')->insert($v);
                        }
                    }
                    if($add){
                        echo 1;die;
                    }
                }else{
                    echo "<script>alert('上传文件失败！')</script>";die;
                }
            }else{
                echo "<script>alert('上传文件过大！')</script>";die;
            }
        }
    }