Дмитрий

<form action="" method="get" accept-charset="utf-8">
<input type="file" name="file" value="" id="file">
<p><input type="submit" value="Continue"></p>
</form>

var filesize = document.forms[0].file.files[0].fileSize;

$hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']);
echo $hostname;