excel后缀是xls
//文件名
$file_name = dirname(__FILE__) . '/SN2021-11-24 15_07.xls';
$objReader = \PHPExcel_IOFactory::createReader('Excel5');
$obj_PHPExcel = $objReader->load($file_name, $encode = 'utf-8'); //加载文件内容,编码utf-8
$excel_array = $obj_PHPExcel->getsheet(0)->toArray(); //转换为数组格式