phpexcel 导入显示The filename is not recognised as an OLE file,

phpexcel 导入显示The filename  is not recognised as an OLE file,
显示这个错误 一般是格式问题

需要在导入后 加入 下面代码

    if($Extension == '.xlsx'){
            $reader = IOFactory::createReader('Xlsx');
        } else if($Extension == '.xls') {
            $reader = IOFactory::createReader('Xls');
        } else if($Extension == '.csv') {
            $reader = IOFactory::createReader('Csv');
            $reader->setInputEncoding('GB2312');  
        }

为了区分格式，不然就会出现这个错误