php download 下载

下面是php下载的程序

<?php

/**
 * download page
 *
 * @author  shipingzhong <shipingzhong@altech-it.cn>
 * @version 20090525
 */
session_cache_limiter("public"); // for IE
// read user common file
//include this file.... and it has smarty function
$file_path = dirname($_SERVER['SCRIPT_FILENAME']).'/download/andriod.apk';
Header("Content-type: application/octet-stream");
//Header("Content-type: application/txt");
Header("Accept-Ranges: bytes");
Header("Accept-Length: ".filesize($file_path));
//Header("Content-Disposition: attachment; filename=" . $showFileName);
Header("Content-Disposition: attachment; filename=\"andriod.apk\"");
 $fp=fopen($file_path, "r");
 echo fread($fp, filesize($file_path));
 fclose($fp);
//
//exit;
?>