PHP-Download无法正常运行

Question

I want to dowload as a web-client a photo from my webserver with PHP. 我想通过PHP从我的网络服务器下载一个网络客户端照片。

Therefore, I've written the following PHP-Script: 因此，我编写了以下PHP脚本：

header('Content-Description: File Transfer');
header('Content-Type: image/jpg');
header('Content-Disposition: attachment; filename='.$filename);
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate');
header('Pragma: public');
header('Content-Length: ' . filesize($filename));

readfile("/var/www/_old/pictures/".$filename);

( $filename is the name of the file, like screenshot_03.06.2016-19:36:50.jpg ) （ $ filename是文件的名称，如screenshot_03.06.2016-19：36：50.jpg ）

The problem is, the content of this downloaded image is not the image itself, it's the code from the current website. 问题是，这个下载图像的内容不是图像本身，而是来自当前网站的代码。 The download works fine, but I cannot open the image properly ... 下载工作正常，但我无法正常打开图像...

Answer 1

OK. 好。

After some time, I found a working solution. 过了一段时间，我找到了一个有效的解决方案

My problem was, that I wrote the header-commands AFTER some output. 我的问题是，我在一些输出之后编写了header-commands。 According to the php documentation, this is forbidden. 根据php文档，这是禁止的。

So all I did is this, I created a new .php-file and checked if the session (in which I previously stored the needed information - filename and download-command) was set correct. 所以我所做的就是这个，我创建了一个新的.php文件，并检查会话（我之前存储了所需信息 - filename和download-command）是否设置正确。 On the previous page, I received the POST-information, stored it into the session and redirected (also with header-command) to the newly created php-file. 在上一页中，我收到了POST信息，将其存储到会话中并重定向（也使用header-command）到新创建的php文件。

Then I wrote these header-commands: 然后我写了这些header-commands：

    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="'.basename($filename).'"');

    readfile($filename);

And now, the download works from all browsers (also IE!). 现在，下载适用于所有浏览器（也是IE！）。

Here is all my code, I hope this could help someone: 这是我的所有代码，我希望这可以帮助某人：

1st page (where I receive the POST-infos): 第1页（我收到POST信息的地方）：

session_start();

...
...

if(isset($_POST["galerie_submitBt"])){

    if($_POST["galerie_submitBt"] === "Herunterladen") {            //Das Herunterladen muss in einer eigenen Datei passieren, bevor jeglichen Outputs

        $_SESSION["download_Screenshot"] = true;
        $_SESSION["filename"] = "/var/www/_old/pictures/".$_POST["filename"];

        header("Location:modules/php/download_Screenshot.php");
    }
}

?>
<!DOCTYPE html>
<html>
    <head>
       <title>...

2nd, new created php-page (where I actually download the image): 2，新创建的php页面（我实际下载图像的地方）：

session_start();

if(isset($_SESSION["download_Screenshot"])){

  if(isset($_SESSION["filename"]) && file_exists($_SESSION["filename"])) {

    $filename = $_SESSION["filename"];          //Filename also includes the path! (absolute path)

    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="'.basename($filename).'"');

    readfile($filename);

    unset($_SESSION["filename"]);
    unset($_SESSION["download_Screenshot"]);
  }
}

PHP-Download无法正常运行

问题描述

1 个解决方案

解决方案1
0 已采纳 2016-06-05 09:27:33

PHP-Download无法正常运行

问题描述

1 个解决方案

解决方案1 0 已采纳 2016-06-05 09:27:33

解决方案1
0 已采纳 2016-06-05 09:27:33