엑셀(excel)파일로 다운로드 받기 header > PHP

############################################################################
 ## 엑셀파일 저장헤드
$file_name = "{$inputY}_{$inputM}_{$inputD}.xls";
 header( "Content-type: application/vnd.ms-excel" );
 header( "Content-Disposition: attachment; filename=$file_name" );
 header( "Content-Description: PHP4 Generated Data" );


 header("Content-type: application/vnd.ms-excel");
 header("Content-Disposition: attachment; filename=$filename");
 header("Expires: 0");
 header("Cache-Control: must-revalidate, post-check=0,pre-check=0");
 header("Pragma: public");