Slim 3 框架如何下载文件

Question

我正在尝试使用 Slim 3 PHP 框架下载文件。 Slim 2 相当简单，我相信 Slim 3 也是如此，但我就是不明白。

任何帮助将不胜感激。 基于此处的文档：http://www.slimframework.com/docs/objects/response.html 我从这里添加了包： https://github.com/guzzle/psr7

所以我的代码此时看起来像：

$app->get('/worksheet/download/{filename}', function ($request, $response, $args) {

    error_log("__________________________");

    $fileName = $args['filename'];
    error_log($fileName);
    $newStream = new \GuzzleHttp\Psr7\LazyOpenStream($fileName, 'r');


    $newResponse = $response->withHeader('Content-type', 'application/octet-stream')
        ->withHeader('Content-Description', 'File Transfer')
        ->withHeader('Content-Disposition', 'attachment; filename=' . basename($fileName))
        ->withHeader('Content-Transfer-Encoding', 'binary')
        ->withHeader('Expires', '0')
        ->withHeader('Cache-Control', 'must-revalidate')
        ->withHeader('Pragma', 'public')
        ->withHeader('Content-Length', filesize($fileName))
        ->withBody($newStream);
return($newResponse);
});

Answer 1

我正在使用来自 php 的readfile method：

$file = 'monkey.gif';

if (file_exists($file)) {
    header('Content-Description: File Transfer');
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment;filename="'.basename($file).'"');
    header('Expires: 0');
    header('Cache-Control: must-revalidate');
    header('Pragma: public');
    header('Content-Length: ' . filesize($file));
    readfile($file);
    exit;
}

这个例子来自上面的链接，也许你可以尝试用 Slim Response 对象和 WithHeader 方法来实现这些 headers。

{filename} 和 [{filename}] 的区别在于第二种形式，文件名是可选的。

$app->get('/my[/{optional}]/route', function($req, $res, $args) {});
$app->get('/myother/{not_optional}/route', function($req, $res, $args) {});

在此示例中，您可以访问 /my/route，因为不需要参数，但您无法访问 /myother/route，因为您需要 not_optional 参数。
Slim documentation有更多信息。

编辑

$app->get('/download', function($req, $res, $args) {
    $file = 'public_html/images/back2.jpg';
    $response = $res->withHeader('Content-Description', 'File Transfer')
   ->withHeader('Content-Type', 'application/octet-stream')
   ->withHeader('Content-Disposition', 'attachment;filename="'.basename($file).'"')
   ->withHeader('Expires', '0')
   ->withHeader('Cache-Control', 'must-revalidate')
   ->withHeader('Pragma', 'public')
   ->withHeader('Content-Length', filesize($file));

readfile($file);
return $response;
});

这段代码对我来说很好用，它是用 Slim 3.3.0 制作的

Answer 2

$app->get('/test-download', function($request, Slim\Http\Response $response, $args) {
    $file = __DIR__ . '/2.csv';
    $fh = fopen($file, 'rb');

    $stream = new \Slim\Http\Stream($fh); // create a stream instance for the response body

    return $response->withHeader('Content-Type', 'application/force-download')
                    ->withHeader('Content-Type', 'application/octet-stream')
                    ->withHeader('Content-Type', 'application/download')
                    ->withHeader('Content-Description', 'File Transfer')
                    ->withHeader('Content-Transfer-Encoding', 'binary')
                    ->withHeader('Content-Disposition', 'attachment; filename="' . basename($file) . '"')
                    ->withHeader('Expires', '0')
                    ->withHeader('Cache-Control', 'must-revalidate, post-check=0, pre-check=0')
                    ->withHeader('Pragma', 'public')
                    ->withBody($stream); // all stream contents will be sent to the response
});