php如何把excel转化为csv

$filename = "myexcel.xlsx"; $objReader = PHPExcel_IOFactory::createReader('Excel2007'); $objPHPExcel = $objReader->load($filename); $objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'CSV'); $objWriter->save(str_replace('.xlsx', '.csv',$filename));

统计 111213 212223 =A1+A222SUM(A3:A4) php 输出excel 代码<？phpheader("Content-type:application/vnd.ms-excel");header("Content-Disposition:filename=excel.xls");echo "A1\t B1\t C1\n";echo "A2\t B2\t C2\n";echo "A3\t B3\t c3\n"；？>利用\t来区分单元格利用\n来换行。