$_POST array order

Hi, Quick question regarding $_POST array element order, first the situation: I am submitting a form with x first fields and the post value returns the last element as being the submit button name and value Is it safe to consider that the last element in the $_POST array will ALWAYS be the submit element (it is always last in form)? I would like to array_pop($_POST) to get rid of that last element for various reasons (validation scheme) later on.. Regards, Tim