PHPExcel導(dǎo)入xls文件報(bào)錯(cuò).xlsx正常

 if (strtolower ( $file_type ) == 'xls') {
//                 $objReader = \PHPExcel_IOFactory::createReader('Excel5');這種也不行
                 $objReader = new \PHPExcel_Reader_Excel5();
             } else {
                 //如果excel文件后綴名為.xlsx，導(dǎo)入這個(gè)類
                 $objReader = \PHPExcel_IOFactory::createReader('Excel2007');
             }
             //執(zhí)行到下面這行報(bào)錯(cuò)
//The filename xxx.xls is not recognised as an //OLE file
   $val=$objPHPExcel = $objReader->load($filename,'utf-8');

代碼如上面所示,$filename是正確的文件路徑,現(xiàn)在xls文件上傳就會(huì)報(bào)錯(cuò)The filename xxx.xls is not recognised as an OLE file,但是xlsx的就沒事.百度查了下,寫的基本跟上面的差不多,求大佬解答