在WooCommerce产品描述选项卡中保存并显示自定义字段

function add_custom_field() {
    woocommerce_wp_text_input(
        array(
            'id' => 'custom_field',
            'label' => 'Custom Field',
            'desc_tip' => true,
            'description' => 'Enter the value for the custom field.',
        )
    );
}
add_action('woocommerce_product_options_general_product_data', 'add_custom_field');

function save_custom_field($post_id) {
    $custom_field_value = $_POST['custom_field'];
    if (!empty($custom_field_value)) {
        update_post_meta($post_id, 'custom_field', sanitize_text_field($custom_field_value));
    }
}
add_action('woocommerce_process_product_meta', 'save_custom_field');

function add_custom_tab($tabs) {
    $tabs['custom_tab'] = array(
        'title' => 'Custom Tab',
        'priority' => 50,
        'callback' => 'display_custom_tab_content',
    );
    return $tabs;
}
add_filter('woocommerce_product_tabs', 'add_custom_tab');

function display_custom_tab_content() {
    global $product;
    $custom_field_value = get_post_meta($product->get_id(), 'custom_field', true);
    echo '<h2>Custom Field:</h2>';
    echo '<p>' . $custom_field_value . '</p>';
}