根据单选按钮显示/隐藏WooCommerce发货费率

<?php
/*
Plugin Name: WooCommerce Shipping Rates Toggle
Description: Toggle shipping rates based on radio buttons
Version: 1.0
Author: Your Name
*/

add_action('woocommerce_shipping_init', 'custom_shipping_rates_toggle');
function custom_shipping_rates_toggle() {
    if (is_admin()) {
        add_filter('woocommerce_shipping_calculator_form_fields', 'custom_shipping_rates_form_fields');
    }
}

function custom_shipping_rates_form_fields($fields) {
    $fields['shipping_method'] = array(
        'type' => 'radio',
        'options' => array(
            'standard' => __('Standard', 'woocommerce'),
            'express' => __('Express', 'woocommerce'),
            'next_day' => __('Next Day', 'woocommerce')
        ),
        'default' => 'standard',
        'class' => array('shipping-method')
    );

    return $fields;
}

add_filter('woocommerce_shipping_calculator_shipping_methods', 'custom_shipping_rates_toggle_methods');
function custom_shipping_rates_toggle_methods($methods) {
    $selected_method = isset($_POST['shipping_method']) ? $_POST['shipping_method'] : 'standard';

    foreach ($methods as $method_key => $method) {
        if ($selected_method !== $method_key) {
            unset($methods[$method_key]);
        }
    }

    return $methods;
}