php Symfony2 - 强制下载文件

Symfony2 - Force file download

提问by Xavi

I'm trying to download a file when a user clicks on download link.

当用户单击下载链接时，我正在尝试下载文件。

In Controller:

在控制器中：

    $response = new Response();
    $response->headers->set('Content-type', 'application/octect-stream');
    $response->headers->set('Content-Disposition', sprintf('attachment; filename="%s"', $filename));
    $response->headers->set('Content-Length', filesize($filename));

    return $response;

This is opening the dialog box to save the file, but it says the file is 0 bytes. And changing it to:

这是打开对话框以保存文件，但它说文件是 0 字节。并将其更改为：

        $response = new Response();
        $response->headers->set('Content-type', 'application/octect-stream');
        $response->headers->set('Content-Disposition', sprintf('attachment; filename="%s"', $filename));
        $response->headers->set('Content-Length', filesize($filename));
        $response->headers->set('Content-Transfer-Encoding', 'binary');
        $response->setContent(readfile($filename));

        return $response;

I get a bunch of weird characters instead of the file download dialog box.

我得到一堆奇怪的字符而不是文件下载对话框。

Finally, switching the "setContent" line to:

最后，将“setContent”行切换为：

    $response->setContent(file_get_contents($filename));

It returns a PHP error:

它返回一个 PHP 错误：

Fatal error: Allowed memory size...

致命错误：允许的内存大小...

Any clues on how to achieve this? I've done it before in PHP (wihtout MVC), but I don't know what can be missing to do it through Symfony2...

关于如何实现这一目标的任何线索？我以前在 PHP（没有 MVC）中做过，但我不知道通过 Symfony2 做它会缺少什么......

Maybe the solution is setting the memory_limit in PHP.INI, but I guess it′s not the best practice...

也许解决方案是在 PHP.INI 中设置 memory_limit，但我想这不是最佳实践......

采纳答案by Xavi

First of all, thanks to everyone for your replies. I finally solved this without X-SendFile (which is probably the best practice). Anyway, for those who can't get X-Sendfile apache module to work (shared hosting), here's a solution:

首先感谢大家的回复。我终于在没有 X-SendFile 的情况下解决了这个问题（这可能是最佳实践）。无论如何，对于那些无法让 X-Sendfile apache 模块工作（共享托管）的人，这里有一个解决方案：

// Generate response
$response = new Response();

// Set headers
$response->headers->set('Cache-Control', 'private');
$response->headers->set('Content-type', mime_content_type($filename));
$response->headers->set('Content-Disposition', 'attachment; filename="' . basename($filename) . '";');
$response->headers->set('Content-length', filesize($filename));

// Send headers before outputting anything
$response->sendHeaders();

$response->setContent(file_get_contents($filename));

return $response;

Hope this helps!

希望这可以帮助！

回答by denkweite

The most comfortable solution is

最舒服的解决办法是

use Symfony\Component\HttpFoundation\BinaryFileResponse;
use Symfony\Component\HttpFoundation\ResponseHeaderBag;

$response = new BinaryFileResponse($file);
$response->setContentDisposition(ResponseHeaderBag::DISPOSITION_ATTACHMENT);

return $response;

回答by lisachenko

You shouldn't use PHP for downloading files because it's a task for an Apache or Nginx server. Best option is to use X-Accel-Redirect (in case of Nginx) / X-Sendfile (in case of Apache) headers for file downloading.

您不应该使用 PHP 下载文件，因为这是 Apache 或 Nginx 服务器的任务。最好的选择是使用 X-Accel-Redirect（在 Nginx 的情况下）/X-Sendfile（在 Apache 的情况下）头文件下载。

Following action snippet can be used with configured Nginx to download files from Symfony2:

以下操作片段可与配置的 Nginx 一起使用以从 Symfony2 下载文件：

return new Response('', 200, array('X-Accel-Redirect' => $filename));

UPD1:Code for apache with configured mod_xsendfile:

UPD1：配置了 mod_xsendfile 的 apache 代码：

return new Response('', 200, array(
    'X-Sendfile'          => $filename,
    'Content-type'        => 'application/octet-stream',
    'Content-Disposition' => sprintf('attachment; filename="%s"', $filename))
);

回答by Pascal

Don't know if it can help but it's application/octet-streamnot application/octect-stream

不知道它是否可以帮助但它application/octet-stream不是application/octect-stream

回答by COil

As of Symfony 3.2 you can use the file() controller helperwhich is a shortcut for creating a BinaryFileResponseas mentioned in a previous answer:

从 Symfony 3.2 开始，您可以使用file() 控制器助手，这是创建BinaryFileResponse前面答案中提到的a 的快捷方式：

public function fileAction()
{
    // send the file contents and force the browser to download it
    return $this->file('/path/to/some_file.pdf');
}

回答by Jaycreation

+1 for alexander response.

+1 代表亚历山大回应。

But if you can't use X-Sendfile, you should use the BinaryFileResponse added in the 2.2: http://symfony.com/doc/current/components/http_foundation/introduction.html#serving-files

但是如果你不能使用X-Sendfile，你应该使用2.2中添加的BinaryFileResponse：http://symfony.com/doc/current/components/http_foundation/introduction.html#serving-files

In my project the result is

在我的项目中，结果是

$response = new \Symfony\Component\HttpFoundation\BinaryFileResponse($dir .DIRECTORY_SEPARATOR. $zipName);

$d = $response->headers->makeDisposition(
    ResponseHeaderBag::DISPOSITION_ATTACHMENT,
    $zipName
   );

$response->headers->set('Content-Disposition', $d);

return $response;

回答by Henry

For those who don't have the option of setting headers:

对于那些没有设置标题选项的人：

The downloadattribute may help depending on which browsers you need to support:

该download属性可能会有所帮助，具体取决于您需要支持的浏览器：

<a href="{file url}" download>

<a href="{file url}" download>

or

或者

<a href="{file url}" download="{a different file name}">

<a href="{file url}" download="{a different file name}">

This is not supported in all legacy browsers. See this page for browser support:

并非所有旧版浏览器都支持此功能。请参阅此页面以获取浏览器支持：

https://www.w3schools.com/tags/att_a_download.asp

https://www.w3schools.com/tags/att_a_download.asp