PHP的memory_limit的，和的upload_max_filesize post_max_filesize的关系 [英] Relationship between php’s memory_limit, upload_max_filesize and post_max_filesize

问题描述

底线：结果
我是否需要关注有关设置的 post_max_filesize 的>>的 memory_limit的 ？

Bottom-line:
Do I need to be concerned about setting post_max_filesize >> memory_limit?

详情：结果
<一href=\"http://stackoverflow.com/questions/3651141/in-php-settings-should-memory-limit-upload-max-filesize#answer-3651195\">This答案表明，上传的文件不需要适应PHP的memory_limit的范围内。该 PHP文档表明，整个帖子应该PHP的内存限制内适应。

Details:
This answer suggests that uploaded files do not need to fit within php’s memory_limit. The php docs suggest that the entire post should fit within php’s memory limit.

我发现令人惊讶的文档，我希望有人能细说。例如采取以下PHP CONFIGS：

I find the docs surprising and I’m hoping someone can elaborate. For example take the following php configs:

; config A
memory_limit = 50M
upload_max_filesize = 100M
post_max_filesize = 1000M
max_file_uploads = 10    

和

; config B
memory_limit = 50M
upload_max_filesize = 10M
post_max_filesize = 1000M
max_file_uploads = 100    

有了这些配置，我期望能够为：

• 上传10x100mb文件到服务器的 A 的
• 和100x10mb文件服务器的乙的
• 与上传到服务器上的10个文件中的任何一个工作的 A 的是一个问题（在50M包文件100MS ...）
与上传到服务器上的100个文件中的任何1个工作的乙的是好的（10; 50）。
• Working with any one of the 10 files uploaded to server A is a problem (100Ms of file in a 50M bag…).
• Working with any 1 of the 100 files uploaded to server B is okay (10 < 50).

这经验将带领我说，一般memory_limit应该比的 的upload_max_filesize 的大;相反，PHP 文档说：

This experience would lead me to say that "generally the memory_limit should be larger than the upload_max_filesize"; instead, the php docs say:

通常说，memory_limit应该比的 的post_max_size 的

generally speaking, memory_limit should be larger than post_max_size.

为什么，如果不是发生了什么？

Why and what happens if it isn't?

在我的PHP code执行我看，没有证据表明所有发布文件都在内存中。这在我看来，我的一切是完全在磁盘上找到路径文件的$ _FILES数组。 PHP是持有在内存中的整个后在之前我反思环境的能力一定意义呢？我是否需要关注有关设置的 post_max_filesize 的>>的 memory_limit的 ？

When my php code is executed I see no evidence that all of the posted files are in memory. It seems to me that all I’ve got is a $_FILES array of paths to files found exclusively on disk. Is php holding the whole post in memory at some point prior to my ability to introspect the environment? Do I need to be concerned about setting post_max_filesize >> memory_limit?

旁白：结果
违反本手册的规则不会导致严重破服务器（W / PHP5.3的Apache2.2的debian 6）。

Aside:
Violating the manual's rule does not result in a grossly broken server (w/ php5.3 apache2.2 debian 6).

推荐答案

PHP将接受单项金额超过的upload_max_filesize 小，共同采取比<$ C $少上传的文件C>的post_max_size 字节。 PHP文档是错误的关于 memory_limit的这并不需要持有该文件的内容发布。

PHP will accept uploaded files that are individually smaller than upload_max_filesize and together take less than post_max_size bytes. The PHP documentation is wrong with regard to memory_limit which does not need to hold the file contents posted.

下面的配置可以使用两种模块的Apache2和CGI，并接受文件超过1G小。

The following configuration works with both Apache2 module and CGI, and accepts files smaller than 1G.

 upload_max_filesize = 1G
 post_max_size = 1G
 memory_limit = 32M

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