ThinkPHP3.2.3+PHPExcel实现将表格数据导入到数据库

<form action="{:U('upload')}" enctype="multipart/form-data" method="post">
    <input type="file"name="photo" />
    <input type="submit"value="导入数据">
</form>

//文件导入的操作
    public function  upload(){
        ini_set('memory_limit','1024M');
        if (!empty($_FILES)) {
            $config = array(
                'exts' => array('xlsx','xls'),
                'maxSize' => 3145728000,
                'rootPath' =>"./Public/",
                'savePath' => 'Uploads/',
                'subName' => array('date','Ymd'),
            );
            $upload = new \Think\Upload($config);
            if (!$info = $upload->upload()) {
                $this->error($upload->getError());
            }
            vendor("PHPExcel.PHPExcel");
            $file_name=$upload->rootPath.$info['photo']['savepath'].$info['photo']['savename'];
            $extension = strtolower(pathinfo($file_name, PATHINFO_EXTENSION));//判断导入表格后缀格式
            if ($extension == 'xlsx') {
                $objReader = \PHPExcel_IOFactory::createReader('Excel2007');
                $objPHPExcel =$objReader->load($file_name, $encode = 'utf-8');
            } else if ($extension == 'xls'){
                $objReader = \PHPExcel_IOFactory::createReader('Excel5');
                $objPHPExcel =$objReader->load($file_name, $encode = 'utf-8');
            }
            $sheet =$objPHPExcel->getSheet(0);
            $highestRow = $sheet->getHighestRow();//取得总行数
            $highestColumn =$sheet->getHighestColumn(); //取得总列数
            //D('UsersRank')->execute('truncate table hy_users_rank');
            for ($i = 2; $i <= $highestRow; $i++) {
//看这里看这里,前面小写的a是表中的字段名，后面的大写A是excel中位置
                //$data['rank_id'] =$objPHPExcel->getActiveSheet()->getCell("A" . $i)->getValue();
                $data['rank_type'] =$objPHPExcel->getActiveSheet()->getCell("B" .$i)->getValue();
                $data['rank_grade'] =$objPHPExcel->getActiveSheet()->getCell("C" .$i)->getValue();
                $data['rank_title'] = $objPHPExcel->getActiveSheet()->getCell("D". $i)->getValue();
//看这里看这里,这个位置写数据库中的表名

                D('UsersRank')->add($data);
            }
            $this->success('导入成功!');
        } else {
            $this->error("请选择上传的文件");
        }
    }