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copy() and move_uploaded_file() are, for all practical purposes, the same, except move_uploaded_file() is specifically for uploaded files. copy() will incur an error when you are running in safe_mode, most likely.
Just for clarification: When your script calls copy() or move_uploaded_file() for anything that it finds in $_FILES the actual upload client->server already took place, i.e. the data is already on the server and php stored it in temporary files.