Updating WooCommerce Admin Shipping Order Fields - php

Question

In functions.php I am trying to use this, but it is not working:
function rt_woocommerce_admin_shipping_fields( $fields ) {
$fields['first_name']['value'] = $_GET['f'];
$fields['last_name']['value'] = $_GET['l'];
$fields['address_1']['value'] = $_GET['a'];
$fields['address_2']['value'] = $_GET['b'];
// etc
// etc
return $fields;
}
add_filter( 'woocommerce_admin_shipping_fields', 'rt_woocommerce_admin_shipping_fields' );
woocommerce_admin_billing_fields() works but the shipping function does not. Any advice? I need to update the fields with $_GET variables on page load. This works perfectly for the billing fields.

Answer 1

The array has label and show indexes for each item in shipping fields. There is no value index by default. See the woocommerce_admin_shipping_fields filter below.
self::$shipping_fields = apply_filters(
'woocommerce_admin_shipping_fields',
array(
'first_name' => array(
'label' => __( 'First name', 'woocommerce' ),
'show' => false,
),
'last_name' => array(
'label' => __( 'Last name', 'woocommerce' ),
'show' => false,
),
'company' => array(
'label' => __( 'Company', 'woocommerce' ),
'show' => false,
),
'address_1' => array(
'label' => __( 'Address line 1', 'woocommerce' ),
'show' => false,
),
'address_2' => array(
'label' => __( 'Address line 2', 'woocommerce' ),
'show' => false,
),
'city' => array(
'label' => __( 'City', 'woocommerce' ),
'show' => false,
),
'postcode' => array(
'label' => __( 'Postcode / ZIP', 'woocommerce' ),
'show' => false,
),
'country' => array(
'label' => __( 'Country / Region', 'woocommerce' ),
'show' => false,
'type' => 'select',
'class' => 'js_field-country select short',
'options' => array( '' => __( 'Select a country / region…', 'woocommerce' ) ) + WC()->countries->get_shipping_countries(),
),
'state' => array(
'label' => __( 'State / County', 'woocommerce' ),
'class' => 'js_field-state select short',
'show' => false,
),
'phone' => array(
'label' => __( 'Phone', 'woocommerce' ),
),
)
);