thinkphp操作phpexcel问题

    public function get_detail()
    {
        Vendor("PHPExcel.PHPExcel",‘‘,‘.php‘);
        $obj = new \PHPExcel;
        $filename = self::FILE_DIR.‘my_data.xls‘;
        try {
            $inputFileType = \PHPExcel_IOFactory::identify($filename);
            $objReader = \PHPExcel_IOFactory::createReader($inputFileType);
            $objPHPExcel = $objReader->load($filename);
        } catch (Exception $e) {
            die(‘加载文件发生错误：‘.pathinfo($filename,PATHINFO_BASENAME).‘:‘.$e->getMessage());
        }
        $sheet = $objPHPExcel->getSheet(0);
        $highestRow = $sheet->getHighestRow();
        $highestColumn = $sheet->getHighestColumn();
        for ($i=1; $i <= $highestRow ; $i++) { 
            $rowData[] = $sheet->rangeToArray("A{$i}:{$highestColumn}{$i}",null,true,false);
        }
        echo json_encode($rowData);
    }