How to reorder billing fields in WooCommerce Checkout template? [closed]

I’m creating a madlib style checkout form using WooTheme’s Customizing checkout fields using actions and filters.

Billing fields in the checkout template form-billing.phpare displayed with this call:

<?php foreach ($checkout->checkout_fields['billing'] as $key => $field) : ?>
<?php woocommerce_form_field( $key, $field, $checkout->get_value( $key ) ); ?>
<?php endforeach; ?>

How can change the order the fields appear?

The current (default) field order is:
first name
last name
company (hidden for me)
town/city
zipcode
country
state
email
phone

Default order:

I want the fields to be in a more natural order for Americans (where I live), so:
first name
last name
company (hidden for me)
town/city
state
zipcode
country
email
phone

How can I best do this?

Same can be done through functions.php in your (child) theme:

add_filter("woocommerce_checkout_fields", "order_fields");

function order_fields($fields) {

    $order = array(
        "billing_first_name", 
        "billing_last_name", 
        "billing_company", 
        "billing_address_1", 
        "billing_address_2", 
        "billing_postcode", 
        "billing_country", 
        "billing_email", 
        "billing_phone"

    );
    foreach($order as $field)
    {
        $ordered_fields[$field] = $fields["billing"][$field];
    }

    $fields["billing"] = $ordered_fields;
    return $fields;

}