php phpexcel 读取excel文件数据

public function readExcel(){
    $allPath = '/home/examine\video/list.xls';

    \think\Loader::import('extend.excel.PHPExcel', ROOT_PATH);
    $PHPExcel = new \PHPExcel();
    $redis = new \app\common\service\Redis();

    /*         * 默认用excel2007读取excel，若格式不对，则用之前的版本进行读取 */
    $PHPReader = new \PHPExcel_Reader_Excel2007();
    if (!$PHPReader->canRead($allPath)) {
        $PHPReader = new \PHPExcel_Reader_Excel5();
        if (!$PHPReader->canRead($allPath)) {
            echo 'no Excel';die;
        }
    }

    $phpExcel = $PHPReader->load($allPath);
    $objWriter = new \PHPExcel_Writer_Excel5($PHPExcel);
    $currentSheet = $phpExcel->getSheet(0);  //读取excel文件中的第一个工作表
    $allColumn = $currentSheet->getHighestColumn(); //取得最大的列号
    $allRow = $currentSheet->getHighestRow(); //取得一共有多少行
    $excelResult = array();  //声明数组

    //从第一行开始读取数据
    $startRow = $redis->get('startRow') ? $redis->get('startRow')+1 : 2;
    $endRow = $startRow + 500;
    if($endRow >= $allRow){
        $endRow = $allRow;
    }
    for ($j = $startRow; $j <= $endRow; $j++) {
        //从A列读取数据
        for ($k = 'A'; $k <= $allColumn; $k++) {
            // 读取单元格
            $excelResult[$j][] = (string)$phpExcel->getActiveSheet()->getCell("$k$j")->getValue();
        }
    }
    dp($excelResult);
}