Description:
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This is more or less a duplicate of this bug report:

- https://bugs.php.net/bug.php?id=52229

I am opening a new one because I think my comment there went by unnoticed.

http://www.php.net/manual/en/ini.core.php#ini.post-max-size states:

“If memory limit is enabled by your configure script, memory_limit also affects
file uploading. Generally speaking, memory_limit should be larger than
post_max_size.”

To me, the phrasing is misleading as it implies that file uploads (<input
type="file">, multipart/form-data, $_FILES array) have to fit into
memory_limit. That is probably not the case. It is my understanding that the
second sentence from the quote only holds true for large
application/x-www-form-urlencoded POST requests (without file uploads) while
the first sentence is more or less incorrect/superfluous.

For example, uploading two 4M files with settings memory_limit 2M,
post_max_size 10M, upload_max_filesize 5M should work. 4M < upload_max_filesize
and 4M+4M < post_max_size. memory_limit should not affect this at all.

Other mentions and discussion of this issue:

- http://stackoverflow.com/questions/3651141/in-php-settings-should-memory-limit-upload-max-filesize
- http://stackoverflow.com/questions/5106871/relationship-between-phps-memory-limit-upload-max-filesize-and-post-max-filesi