以下内容将影响我的帐户“地址”部分字段和结帐字段，从而允许在相关的我的帐户部分上自定义帐单和送货字段。

1) 对于“我的帐户”和结账上的地址字段（账单和送货）：

在某些情况下，您需要对地址字段使用此过滤器，它会应用于所有结算和送货默认字段：

// Billing and Shipping fields on my account edit-addresses and checkout
add_filter( 'woocommerce_default_address_fields' , 'custom_override_default_address_fields' );
function custom_override_default_address_fields( $fields ) {
    $fields['first_name']['label'] = 'First name';
    $fields['last_name']['label'] = 'Last name';
    $fields['company']['label'] = 'Company name';
    $fields['address_1']['label'] = 'Street address';
    $fields['address_2']['label'] = 'Apartment, unit, etc.';
    $fields['city']['label'] = 'City';
    $fields['country']['label'] = 'Country';
    $fields['state']['label'] = 'County/State';
    $fields['postcode']['label'] = 'Postcode';

    return $fields;
}

您可以使用 WooCommerce 条件标签 is_account_page() 和 is_checkout() 来定位我的帐户页面或结帐页面...

2) 对于我帐户上的账单字段，编辑地址和结账：

// Billing fields on my account edit-addresses and checkout
add_filter( 'woocommerce_billing_fields' , 'custom_billing_fields' );
function custom_billing_fields( $fields ) {

    // Billing Fields
    $fields['billing_first_name']['label'] = 'First name';
    $fields['billing_last_name']['label'] = 'Last name';
    $fields['billing_company']['label'] = 'Company name';
    $fields['billing_address_1']['label'] = 'Street address';
    $fields['billing_address_2']['label'] = 'Apartment, unit, etc.';
    $fields['billing_city']['label'] = 'City';
    $fields['billing_country']['label'] = 'Country';
    $fields['billing_state']['label'] = 'County/State';
    $fields['billing_postcode']['label'] = 'Postcode';
    $fields['billing_email']['label'] = 'Email';
    $fields['billing_phone']['label'] = 'Phone';

    return $fields;
}

3) 对于我帐户上的运送字段，编辑地址和结帐

// Shipping fields on my account edit-addresses and checkout
add_filter( 'woocommerce_shipping_fields' , 'custom_shipping_fields' );
function custom_shipping_fields( $fields ) {

    // Shipping Fields
    $fields['shipping_first_name']['label'] = 'First name';
    $fields['shipping_last_name']['label'] = 'Last name';
    $fields['shipping_company']['label'] = 'Company name';
    $fields['shipping_address_1']['label'] = 'Street address';
    $fields['shipping_address_2']['label'] = 'Apartment, unit, etc.';
    $fields['shipping_city']['label'] = 'City';
    $fields['shipping_country']['label'] = 'Country';
    $fields['shipping_state']['label'] = 'County/State';
    $fields['shipping_postcode']['label'] = 'Postcode';
    $fields['shipping_email']['label'] = 'Email';
    $fields['shipping_phone']['label'] = 'Phone';

    return $fields;
}

4) 所有（其他）字段仅在结帐时使用：

// All fields only on checkout
add_filter( 'woocommerce_checkout_fields' , 'other_custom_checkout_fields' );
function other_custom_checkout_fields( $fields ) {

    // Account Fields
    $fields['account']['account_username']['label'] = 'Username or email';
    $fields['account']['account_password']['label'] = 'Password';

    // Order Fields
    $fields['order']['order_comments']['label'] = 'Order notes';

    return $fields;
}

5) 另外，根据所选国家/地区，您应该需要使用过滤器：

• woocommerce_country_locale_field_selectors
• woocommerce_get_country_locale_default

这些位于 WC_Country 类中。

代码位于活动子主题（或活动主题）的functions.php 文件中。

相关官方文档：自定义结账使用操作和过滤器的字段