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Editorial Team
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Asked: 2026-05-16T17:32:50+00:00

I know you can control the size of uploads in PHP using $_FILES[‘userfile’][‘size’] >

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I know you can control the size of uploads in PHP using $_FILES['userfile']['size'] > XXX

My question I suppose is performance related.

When you upload a file, my understanding is the whole file gets uploaded to a temporary location, and then you have access to $_FILES

What happens if a user attempts to upload a 10gb file? (as an example of a very large file)

If a large file is attempted to be uploaded, does this waste server bandwidth as the file needs to be uploaded before it can be processed/validated.

I know PHP has like timeouts etc but I’m curious if there is a performance impact from users attempting to upload very large files, even if (for example) the max file size is 2mb.

Is this a concern or something unavoidable and just to not worry.

Thanks.

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1 Answer

  1. Editorial Team

    Both apache and php have max-post limitation to prevent such behavior.

    from php.ini:

    ; Maximum allowed size for uploaded files.
upload_max_filesize = 4M
; Maximum size of POST data that PHP will accept.
post_max_size = 8M
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