Description:
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I am submitting this as a bug because PHP will instantly return an empty $_SESSION 
array if the file size sum of all uploaded files is larger than allowed by 
post_max_size or upload_max_filesize even though the browser continues to upload. 
I would expect that PHP would automatically cancel these uploads, or at least 
return an error so I can use $_SESSION[key]['cancel_upload']; myself. 

I'm on PHP 5.4.3, Win Server 2003 x86, IIS6 as fast_cgi. 
session.upload_progress.cleanup is turned off so I could try and debug this. It's 
not happening because of the cleanup process.

Test script:
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Here is what you can use to duplicate the issue:
http://phphq.net/_upbug/

Expected result:
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I would expect some sort of error.

Actual result:
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Null responce