OK, now that you understand the requirement and use of $_POST, it becomes quite clear that with bigger forms you are going to spend a lot of time typing (even if you include all your $_POST in an include file).
Try @extract($_POST); at the top of your page.
Just that - for all variables. No need to $var=$_POST['var']: for each variable.
But know this - you WILL make use the way you've been doing it up to now every now and then.
AND if you are passing arrays, you will have to do extract them like this (working with $language):
while (list ($key,$lang) = @each ($language)) {
echo "$lang,";
}