php文件强力下载 [英] php file force download

问题描述

当我使用此代码下载此图像（仅用于测试目的）时，我打开下载的图像，所有它给我的是一个错误。我试过在铬。打开它与Windows照片查看器，它说，它不能显示图片，因为它是空的？
这里是代码：

 <？PHP 
 //定义文件路径
 $ file ='http://www.media.lonelyplanet.com/lpi/12553/12553-11/469x264.jpg'; 
 
 if（！file）
 {
 //文件不存在，输出错误
 die（'file not found'）; 
} 
 else 
 {
 header（'Content-Description：File Transfer'）; 
 header（'Content-Type：application / octet-stream'）; 
 header（'Content-Disposition：attachment; filename ='。basename（$ file））; 
 header（'Content-Transfer-Encoding：binary'）; 
 header（'Expires：0'）; 
 header（'Cache-Control：must-revalidate，post-check = 0，pre-check = 0'）; 
 header（'Pragma：public'）; 
 header（'Content-Length：'。filesize（$ file））; 
 ob_clean（）; 
 flush（）; 
 readfile（$ file）; 
退出; 
} 
？> 
  

解决方案

我有机会解决这个问题。您的问题是双重的。

首先，从网址中删除 www。

其次，删除对 filesize（$ file）的调用，因为PHP不知道文件的大小在它下载文件之前。 （真的，只是删除整行）

删除这两件事，我是成功的。

When I use this code to download this image (only used for testing purposes), I open the downloaded image, and all it gives me is an error. i tried it in chrome. opening it with windows photo viewer, it says that it can't display the picture because it is empty??? here is the code:

<?PHP
 // Define the path to file
 $file = 'http://www.media.lonelyplanet.com/lpi/12553/12553-11/469x264.jpg';

 if(!file)
 {
     // File doesn't exist, output error
     die('file not found');
 }
 else
 {
     header('Content-Description: File Transfer');
        header('Content-Type: application/octet-stream');
        header('Content-Disposition: attachment; filename='.basename($file));
        header('Content-Transfer-Encoding: binary');
        header('Expires: 0');
        header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
        header('Pragma: public');
        header('Content-Length: ' . filesize($file));
        ob_clean();
        flush();
        readfile($file);
        exit;
 }
 ?>

解决方案

I've had a chance to work it out. Your problem is two-fold.

First, remove the www. from the url.

Second, remove the call to filesize($file) which is throwing an error because PHP doesn't know the size of the file before it downloads the file. (really, just remove the whole line)

Removing these two things, I was successful.

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