$filename = "./".$_REQUEST['name']; //這里是楓哥具體路徑,只要$filename是所要下載文件的完整路徑就可以.
if (!is_file($filename)) {//檢測文件是否存在.
 die('下載的文件好像跟TM誰私奔啦!');
}
$filepath = str_replace('\\', '/', realpath($filename));
$filesize = filesize($filepath);
$filename = substr(strrchr('/'.$filepath, '/'), 1);
$extension = strtolower(substr(strrchr($filepath, '.'), 1));
       // use this unless you want to find the mime type based on extension,文件后綴格式,不解釋.
$mime = array('application/octet-stream');
header('Content-Type: '.$mime);
header('Content-Disposition: attachment; filename="'.$filename.'"');
header('Content-Transfer-Encoding: binary');
header('Content-Length: '.sprintf('%d', $filesize));
header('Expires: 0');
// check for IE only headers,坑爹的IE檢測,你懂的.
if (isset($_SERVER['HTTP_USER_AGENT']) &&((strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false)))
{
 header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
 header('Pragma: public');
}
else
{
 header('Pragma: no-cache');
}
$handle = fopen($filepath, 'rb');
fpassthru($handle);
fclose($handle);