Why Does My File Upload Fail Even Though `upload_max_filesize` is Higher Than My File Size?

PHP: post_max_size Overrides upload_max_filesize

In a recent inquiry, a user encountered a perplexing issue where the post_max_size setting seemed to limit the size of file uploads, even though upload_max_filesize was set higher.

Question:

Given the following PHP.ini settings:

post_max_size = 8Mb
upload_max_filesize = 16Mb

Why is the user unable to upload a 16Mb file via a POST method?

Answer:

The key distinction to understand is that upload_max_filesize limits the size of individual files within a request, while post_max_size limits the total size of the entire HTTP request body, including any POST data and uploaded files.

In this scenario, when the user attempts to upload a 16Mb file:

• upload_max_filesize allows the file to be uploaded, as it is less than 16Mb.
• However, since the total request body size exceeds the post_max_size limit of 8Mb, the request is rejected.

To accommodate larger file uploads, the user has several options:

• Increase post_max_size: Adjust the PHP.ini setting to allow for a larger request body.
• Chunking: Break the large file into smaller chunks that can be uploaded sequentially.
• Multipart/form-data: Use a multipart/form-data encoding for the request, which allows files to be uploaded without being limited by post_max_size.

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