来自脚本的格式错误的标题错误的标头= 1：index.php [英] malformed header from script. Bad header=1: index.php

问题描述

我有一个现在已经有几年历史的网站，它基本上可以提供下载。

I have a website which is a few years old now, it basically offers downloads.

无论如何，因为移动服务器的人无法下载文件，因为它现在给出错误500错误，并在日志文件中带来此错误：

Anyway since moving server people can not download files because its now giving a error 500 error and in the log files it is bringing this error:

来自脚本的格式错误的标头。错误的标头= 1：index.php

malformed header from script. Bad header=1: index.php

与此相关的唯一代码我无论如何都可以看到：

The only code which is related to this which I can see anyway is this:

// Echo $productOptionDetails->file;                
$file = DOWNLOAD_FOLDER. '/'. $productOptionDetailEntity->file;

    if (file_exists($file)) {

        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) + 1);
        ob_clean();
        flush();
        readfile($file);
        exit;
    }

现在如果我输出：

// Echo $productOptionDetails->file;                
$file = DOWNLOAD_FOLDER. '/'. $productOptionDetailEntity->file;

if (file_exists($file)) {
   readfile($file);
   exit;
}

它会输出大量加密文本，因此它显然可以读取内容。

It outputs lots of encrypted text so its obviously reading something.

我所看到的是标题不正确但在阅读了php.net以及其他网站上的内容后，这看起来很好。

What I have read is that the headers are incorrect but after reading loads of content in php.net as well as other websites this looks fine.

任何人都可以大声说出我为什么会收到这些错误吗？

Can anyone give a shout on why I am getting these errors?

谢谢

推荐答案

问题在于

header('Content-Length: ' . filesize($file) + 1);

在加号之前评估点，所以你的代码是字符串+ 1，结果是1，这导致1作为标题发送。
正确的代码应该是

Dot is evaluated before plus so your code is string + 1, result is 1 and this causes that 1 is sent as header. Correct code should be

header('Content-Length: ' . filesize($file));

因为根据这个页面 http://www.php.net/manual/en/function.readfile.php 不使用+1。其他解决方案是

because according to this page http://www.php.net/manual/en/function.readfile.php no +1 is used. Other solution is

header('Content-Length: ' . (filesize($file) + 1));

可以根据需要使用。

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