Want partial upload of large file. HTML / PHP

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PHP

I want to have php script that uploads partial files. Like the first 1 MB of a very large file. Can this be done in PHP with a regular form upload? Like, it close off the connection after 1mb upload... I've looked a lot of uploaders (html5/javascript/flash), and it seems some support 'chunking', and file size limits which sounds 1/2 of what I want.. but I'd of course somehow need to know that it's only a partial of a full file.