PHP 流意外 0x0A [英] PHP streams unexpected 0x0A

问题描述

我正在处理一个关于流的非常奇怪的问题，我相信它是由 stream_copy_to_stream 引起的，但我不太确定.

I'm dealing with a pretty strange issue regarding streams, I believe it's caused by stream_copy_to_stream but I'm not really sure.

伪代码:

$reader = fopen($in_file, 'r'); // tried with rb as well

read X bytes from $reader and process the data

$writer = fopen($out_file, 'w'); // tried with wb as well
$filter = stream_filter_append($reader, 'filter_name', STREAM_FILTER_READ, $options);
stream_copy_to_stream($reader, $writer);

会发生什么:假设在调用 stream_copy_to_stream 时 $reader 中还剩下 N 个字节.生成的文件 $out_file 将有 N 个字节，但 0x0A 将被添加到文件中，最后一个字节将被忽略.示例:

What happens: Let's say that there are N bytes left in $reader when stream_copy_to_stream is called. The resulting file $out_file will have N bytes, but a 0x0A will be prepended to the file, and the last byte will be ignored. Example:

original file start: ffd8 ffe0 0010 4a46 4946 0001
original file end:   b3c1 c557 92bb 3fff d9

resulting file start: 0aff d8ff e000 104a 4649 4600 01
original file end:    b3 c1c5 5792 bb3f ff

起初，我能够通过在调用 stream_copy_to_stream() 之前执行 ob_flush() 来解决这个问题.但是现在我从命令行，从队列(使用 Laravel/Artisan/Beanstalkd)运行代码，这不再起作用.无论文件有多大，问题都会显现出来.我真的不知道这是什么原因造成的.

At first, I was able to fix this problem by executing an ob_flush() before the stream_copy_to_stream() call. But now I'm running the code from the command line, from a queue(using Laravel/Artisan/Beanstalkd) and this doesn't work anymore. No matter how large the file is, the problem manifests. I really have no idea what's causing this.

在 Windows 和 Linux、php 5.5 和 5.6 上都试过了.

Tried on both Windows and Linux, php 5.5 and 5.6.

推荐答案

该问题是由将标头发送到浏览器后传递的换行符引起的，可能是由我在项目中使用的包注入的.我需要做的就是找到导致此问题的文件.

The problem is caused by a newline character passed after the headers are sent to the browser, injected probably by a package I'm using in my project. All I need to do know is find the file causing this.

问题解决了.

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