WooCommerce: Straße und Hausnummer auftrennen

functions.php

<?php
add_filter( 'woocommerce_default_address_fields', 'pp_rename_address_checkout', 9999 );

/**
* Modify address field labe.s
*
* @param  array $address_fields current address fields.
* @return array
*/
function pp_rename_address_checkout( $address_fields ) {
	$address_fields['address_1']['class']       = array( 'form-row-first' );
	$address_fields['address_2']['class']       = array( 'form-row-last' );
	$address_fields['address_2']['label']       = 'Hausnummer';
	$address_fields['address_2']['required']    = true;
	$address_fields['address_1']['placeholder'] = 'Straße';
	$address_fields['address_2']['placeholder'] = 'Hausnummer';
	return $address_fields;
 }