In PHP settings, should memory_limit > upload_max_filesize?
I'm trying to allow users to upload large files (64MB) and am planning to change upload_max_filesize
to 64MB.
However, should I also change memory_limit
to 64MB or larger?
Is memory_limit
connected to upload_max_filesi开发者_开发知识库ze
?
No, it's not necessary.
PHP has different POST readers and handlers depending on the content type of the request. In case of "multipart/form-data" (what is used for sending files), rfc1867_post_handler
acts as a mixed reader/handler. It populates both $_POST
and $_FILES
. What goes into $_POST
counts towards the memory limit, what goes into $_FILES
also counts.
However, $_FILES
has just meta-data about the files, not the files themselves. Those are just written into the disk and hence don't count towards the memory limit.
post_max_size
must be bigger than upload_max_filesize
. If a form contains more file uploads then the post_max_size
must be greater than the sum of them.
The memory_limit
does not have any significant role in file uploads, as uploaded files are stored in the /tmp
(Linux) directory, not in memory. If you want to submit large amount of data with form fields (not file uploads) then you need a big memory_limit
otherwise not.
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