php 强制下载文件
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forcing a file to download
提问by Joshxtothe4
I have a php page with information, and links to files, such as pdf files. The file types can be anything, as they can be uploaded by a user.
我有一个包含信息的 php 页面和文件链接，例如 pdf 文件。文件类型可以是任何类型，因为它们可以由用户上传。
I would like to know how to force a download for any type of file, without forcing a download of links to other pages linked from the site. I know it's possible to do this with headers, but I don't want to break the rest of my site.
我想知道如何强制下载任何类型的文件，而不强制下载从站点链接的其他页面的链接。我知道可以用标题来做到这一点，但我不想破坏我网站的其余部分。
All the links to other pages are done via Javascript, and the actual link is to #, so maybe this would be OK?
到其他页面的所有链接都是通过 Javascript 完成的，实际链接是到 #，所以也许这样可以？
Should I just set
我应该设置
header('Content-Disposition: attachment;)
for the entire page?
整个页面？
回答by Gumbo
You need to send these two header fields for the particular resources:
您需要为特定资源发送这两个标头字段：
Content-Type: application/octet-stream
Content-Disposition: attachment
The Content-Dispositioncan additionally have a filenameparameter.
该Content-Disposition可以另外有一个filename参数。
You can do this either by using a PHP script that sends the files:
您可以使用发送文件的 PHP 脚本来执行此操作：
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment');
readfile($fileToSend);
exit;
And the filenames are passed to that script via URL. Or you use some web server features such as mod_rewriteto force the type:
并且文件名通过 URL 传递给该脚本。或者你使用一些 web 服务器功能，比如mod_rewrite来强制类型：
RewriteEngine on
RewriteRule ^download/ - [L,T=application/octet-stream]
回答by Mantichora
Slightly different style and ready to go :)
风格略有不同，随时可用:)
$file = 'folder/' . $name;
if (! file) {
die('file not found'); //Or do something
} else {
// Set headers
header("Cache-Control: public");
header("Content-Description: File Transfer");
header("Content-Disposition: attachment; filename=$file");
header("Content-Type: application/zip");
header("Content-Transfer-Encoding: binary");
// Read the file from disk
readfile($file);
}
