从ZIP字符串中提取文件 [英] Extract a file from a ZIP string

问题描述

我有一个zip文件的BASE64字符串，其中包含一个XML文件.

I have a BASE64 string of a zip file that contains one single XML file.

关于无需处理磁盘上的文件如何获取XML文件内容的任何想法?

Any ideas on how I could get the contents of the XML file without having to deal with files on the disk?

我非常希望将整个过程保留在内存中，因为XML只有1-5k.

I would like very much to keep the whole process in the memory as the XML only has 1-5k.

不得不编写zip，提取XML然后加载并删除所有内容，这会很烦人.

It would be annoying to have to write the zip, extract the XML and then load it up and delete everything.

推荐答案

经过数小时的研究，我认为在没有临时文件的情况下处理zip是不可能的:

After some hours of research I think it's surprisingly not possible do handle a zip without a temporary file:

1. 第一次尝试使用php://memory将不起作用，因为它是诸如file_get_contents()或ZipArchive::open()之类的函数无法读取的流.注释中是缺少此问题文档的php-bugtracker链接.
2. 具有ZipArchive和::getStream()的流支持，但是如手册中所述，它仅支持对打开的文件进行读取操作.因此，您不能使用它来快速建立存档.
3. zip://包装器也是只读的:使用fopen创建ZIP文件( )包装器

4. 我还尝试了其他类似php wrapper/protocolls的尝试

1. The first try with php://memory will not work, beacuse it's a stream that cannot be read by functions like file_get_contents() or ZipArchive::open(). In the comments is a link to the php-bugtracker for the lack of documentation of this problem.
2. There is a stream support ZipArchive with ::getStream() but as stated in the manual, it only supports reading operation on an opened file. So you cannot build a archive on-the-fly with that.
3. The zip:// wrapper is also read-only: Create ZIP file with fopen() wrapper

4. I also did some attempts with the other php wrappers/protocolls like

 file_get_contents("zip://data://text/plain;base64,{$base64_string}#test.txt")
 $zip->open("php://filter/read=convert.base64-decode/resource={$base64_string}")
 $zip->open("php://filter/read=/resource=php://memory")

但是对我来说，它们根本不起作用，即使手册中有类似的例子.因此，您必须吞下药丸并创建一个临时文件.

but for me they don't work at all, even if there are examples like that in the manual. So you have to swallow the pill and create a temporary file.

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原始答案:

这只是临时存储的方式.希望您自己管理xml的zip处理和解析.

This is just the way of temporary storing. I hope you manage the zip handling and parsing of xml on your own.

使用php php://memory( doc )包装.请注意，这仅对小文件有用，因为它显然存储在内存中.否则，请使用php://temp.

Use the php php://memory (doc) wrapper. Be aware, that this is only usefull for small files, because its stored in the memory - obviously. Otherwise use php://temp instead.

<?php

// the decoded content of your zip file
$text = 'base64 _decoded_ zip content';

// this will empty the memory and appen your zip content
$written = file_put_contents('php://memory', $text);

// bytes written to memory
var_dump($written);

// new instance of the ZipArchive
$zip = new ZipArchive;

// success of the archive reading
var_dump(true === $zip->open('php://memory'));

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