为什么下载的文件没有下载，而是在浏览器中显示？ [英] Why downloaded file is not downloaded instead it is shown in browser?

问题描述

我将网站中的访问者从页面A重定向到页面B.在第B页中，我希望用户获取下载的PDF文件（在加载B页时下载）。
我已经从另一篇文章中获取了代码（参见上一个问题在这里回答），而我的代码页B是如下：

I redirect the visitors in my website from page A to page B. In page B I expect users to get the downloaded PDF file (to be downloaded when page B is loading). I have taken the code from another article (see a previous question answered here) and my code of page B is the following:

<?php
header('Content-Disposition: attachment; filename=nature.pdf');
header('Content-type: application/pdf'); 
$fn=fopen("/wp-content/nature.pdf","r");
fpassthru($fn);
?>

输出不是通过打开下载对话框，而是在浏览器中显示一些不可读的字符，例如以下（我刚刚收到一个小样本）：

The output is not by opening a download dialog box, instead some unreadable characters are displayed in browser such as the following (I have just picked up a small sample below):

％PDF-1.4％ 3 0 obj< > streamx MK1 o + $ zIg& V =T =Xo K i+＃V yx3 ඀（BX pW`

%PDF-1.4 %���� 3 0 obj <>stream x���MK1�o�+�$zIg&�� V=T�=Xo����K��i+#V�yx3��඀(BX�pW`

服务器：OS Linux; PHP版本：5.2.17

Server: OS Linux; PHP version: 5.2.17

访问者 - >浏览器：Firefox;操作系统：Windows 2000

The visitor -> Browser: Firefox; OS: Windows 2000

是否可能由于客户端的旧操作系统而失败？如果没有，有没有人知道如何强制下载的解决方案？非常感谢。

Is it possible to fail due to the old OS on client side? If not, does anybody know a solution how to force the download? Any help would be highly appreciated.

谢谢。

推荐答案

内容长度标题：

ob_clean(); ob_start();
header('Content-Disposition: attachment; filename=nature.pdf');
header('Content-type: application/pdf'); 
header ("Content-Length: ".filesize("/wp-content/nature.pdf"));
readfile("/wp-content/nature.pdf");
exit;

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