直接贴代码！
这是test_download.html，由用户输入文件名，再点击下载，传参给download.php文件
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>测试下载</title> </head> <body> <form action="download.php" method="post"> 请输入文件名:<input type="text" name="filename"> <input type="submit" name="submit" value="点击下载"> </form> </body> </html>
这是download.php，大部分内容都是header（），差不多包含常用的文件类型了
<?php
if($_POST[‘submit‘]){
$filename=$_POST[‘filename‘];
}
header("Content-Type:text/html;charset=utf-8");
header("Content-Disposition:attachment;filename=".$filename);
header("Content-Type: image/jpg");
header("Content-Type:image/png");
header("Content-Type:image/gif");
header("Content-Type:image/jpeg");
header("Content-Type:image/x-png");
header("Content-Type:text/txt");
header("Content-Type:text/plain");
header("Content-Type:text/html");
header("Content-Type:audio/basic");
header("Content-Type:audio/x-m4a");
header("Content-Type:video/mpeg");
header("Content-Type:application/zip");
header("Content-Type:application/x-tar");
header("Content-Type:application/x-gz");
header("Content-Type:application/msword");
header("Content-Type:application/powerpoint");
header("Content-Type:application/vnd.ms-excel");
header("Content-Type:application/x-msdownload");
readfile($filename);
?>
这只是一个示例，至于怎么用，可以自己修改的哈
原文：http://www.cnblogs.com/-beyond/p/7207285.html