uploading large files through php

Hi, I have a script that allows the user to upload a file. Sometimes the files are going to be rather large (in the order of 60Mb). I know that this is very dangerous but only trusted users will be able to upload since they have to login through ssl and the entire session is through ssl. The problem that I am facing is that I can get the script/browser/php to pass such large file. I have modified the upload_max_size variable in php.ini to be larger the 60Mb but this still does not help! Is there any hard limitation that I am unaware of? Thanx -- Mitko

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