รบกวนอธิบายโค้ดดาวโหลดให้ดูทีครับคือทำได้แล้วแต่ไม่เข้าใจกลัวเอาไปทำอย่างอื่นไม่ได้ครับ

//อันนี้ clickfordownload.php
<tr><td>ไฟล์ 1: <a href="downloadfile.php?filename=<?echo "myfile/".$row['FILE1_NAME'];?>"><?echo $row['FILE1_SAVE'];?></a></td></tr>
<?php
//downloadfile.php
// fix for IE catching or PHP bug issue
header("Pragma: public");
header("Expires: 0"); // set expiration time
header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); 
// browser must download file from server instead of cache

// force download dialog
header("Content-Type: application/force-download");
header("Content-Type: application/octet-stream");
header("Content-Type: application/download");

// use the Content-Disposition header to supply a recommended filename and 
// force the browser to display the save dialog. 
header("Content-Disposition: attachment; filename=".basename($filename).";");

/*
The Content-transfer-encoding header should be binary, since the file will be read 
directly from the disk and the raw bytes passed to the downloading computer.
The Content-length header is useful to set for downloads. The browser will be able to 
show a progress meter as a file downloads. The content-lenght can be determines by 
filesize function returns the size of a file. 
*/
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($filename));

readfile("$filename"); 
exit();
?>