[PHP] Non-Cache in forms?

[eric.coleman]

Alright,

When I submit a form, and shoot out an error, such as "Please fill in email address" 
and then send them back to the form, the form seems to be blank...

Why?  What is happening that the form isn't keeping the previously posted data?

My error function looks like so

function crapout($msg, $hidden_msg = FASE) {
echo($msg);
if($hidden_msg != "FALSE") {
echo('<!-- ' . $hidden_msg . ' -->');
}
exit;
}

Thanks,
Eric Coleman