以下是在购物车对象中存储产品自定义字段并在购物车和结帐页面中显示的完整代码:

Here is the complete code to Store product custom field in cart object and display that in Cart and Checkout pages:

// Output the Custom field in Product pages
add_action("woocommerce_before_add_to_cart_button", "options_on_single_product", 1);
function options_on_single_product(){
    ?>
        <label for="custom_field">
            <input type="radio" name="custom_field" checked="checked" value="option1"> option 1 <br />
            <input type="radio" name="custom_field" value="option2"> option 2
        </label> <br />
    <?php
}

// Stores the custom field value in Cart object
add_filter( 'woocommerce_add_cart_item_data', 'save_custom_product_field_data', 10, 2 );
function save_custom_product_field_data( $cart_item_data, $product_id ) {
    if( isset( $_REQUEST['custom_field'] ) ) {
        $cart_item_data[ 'custom_field' ] = esc_attr($_REQUEST['custom_field']);
        // below statement make sure every add to cart action as unique line item
        $cart_item_data['unique_key'] = md5( microtime().rand() );
    }
    return $cart_item_data;
}

// Outuput custom Item value in Cart and Checkout pages
add_filter( 'woocommerce_get_item_data', 'output_custom_product_field_data', 10, 2 );
function output_custom_product_field_data( $cart_data, $cart_item ) {
    if( isset( $cart_item['custom_field'] ) ) {
        $cart_data[] = array(
            'key'       => __('Custom Item', 'woocommerce'),
            'value'     => $cart_item['custom_field'],
            'display'   => $cart_item['custom_field'],
        );
    }
    return $cart_data;
}

代码位于活动子主题(或主题)的 function.php 文件或任何插件文件中.

此代码已经过测试且有效.

This code is tested and works.