php文件强制下载

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，它给我的只是一个错误.我在 chrome 中试过了.用windows photo viewer 打开它，它说它无法显示图片，因为它是空的???这是代码:

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;
 }
 ?>

推荐答案

我有机会解决这个问题.您的问题有两个方面.

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

首先，从 url 中删除 www..

First, remove the www. from the url.

其次，删除对 filesize($file) 的调用，该调用会引发错误，因为 PHP 在下载文件之前不知道文件的大小.(真的，只需删除整行)

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)

去掉这两个东西，我就成功了.

Removing these two things, I was successful.

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