PS:这段代码在win系统下跑没有问题,枫哥亲测可用.如果用的是linux或是其他系统,要要诸位自行测试下啦.

$filename = "./".$_REQUEST["name"]; //这里是枫哥具体路径,只要$filename是所要下载文件的完整路径就可以.
if (!is_file($filename)) {//检测文件是否存在.
 die("下载的文件好像跟TM谁私奔啦!");
}
$filepath = str_replace("\", "/", realpath($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,文件后缀格式,不解释.
$mime = array("application/octet-stream");
header("Content-Type: ".$mime);
header("Content-Disposition: attachment; filename="".$filename.""");
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".sprintf("%d", $filesize));
header("Expires: 0");
// check for IE only headers,坑爹的IE检测,你懂的.
if (isset($_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);

这个代码是枫哥从国外的一个站点上找到的,亲测可用.度娘出来的结果,你懂的.因此在博客上共享出来,希望对大家有用.国外的站,地址忘了,没有办法放出,理解下.最后,严肃的声明下:这个代码不是我写的,是转载的.