header() 函數向客戶端發送原始的 HTTP 報頭。進入指定頁面后就彈出文件下載對話框,如圖

代碼如下:

function download_file($archivo, $downloadfilename = null) { if (file_exists($archivo)) { $downloadfilename = $downloadfilename !== null ? $downloadfilename : basename($archivo); header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename=' . $downloadfilename); header('Content-Transfer-Encoding: binary'); header('Expires: 0'); header('Cache-Control: must-revalidate, post-check=0,