I think thats all based on your server, it's INI, and it's brute power.

Php.ini controls the file upload size via 'upload_max_filesize'.

The http protocol only allows one connection for uploads (this is about all I know). Trying to upload multiple files using multiple file upload fields won't work because of this.

I just want to find a resource that explains the limitations, security reasons/restrictions etc.

I would look into an online book if you can since all those settings are going to differ on different servers.


Google Books results for PHP

I think everyone is misunderstanding what I'm after. I'm looking for a resource that explains the ins and outs of the http protocol related to uploads.

I don't need a work around on how to upload multiple files using php or anything like that. I already work around that issue by using iframes.

Hey.

A bit of Google'ing turned up these two links.
http://www.ietf.org/rfc/rfc2388.txt
http://www.faqs.org/rfcs/rfc1867.html

Does that help?
You could of course always just go directly to the W3C HTTP specifications. (http://www.w3.org/Protocols/rfc2616/rfc2616.html)

Atli, you are king. Thanks for those first two links. Just what I was looking for.

No problem. I'm glad I could help ;-)