Woocommerce将自定义值传递给结帐流程

function custom_checkout_field() {
    echo '<div id="custom_checkout_field"><h2>' . __('Custom Field') . '</h2>';
    woocommerce_form_field('custom_field', array(
        'type' => 'text',
        'class' => array('my-field-class form-row-wide'),
        'label' => __('Custom Field'),
        'placeholder' => __('Enter custom value'),
        ), 
        // Get the value from the order meta
        get_post_meta($order->id, 'Custom Field', true)
    );
    echo '</div>';
}
add_action('woocommerce_after_order_notes', 'custom_checkout_field');

function save_custom_checkout_field($order_id) {
    if (!empty($_POST['custom_field'])) {
        update_post_meta($order_id, 'Custom Field', sanitize_text_field($_POST['custom_field']));
    }
}
add_action('woocommerce_checkout_update_order_meta', 'save_custom_checkout_field');

function display_custom_checkout_field($order) {
    echo '<p><strong>' . __('Custom Field') . ':</strong> ' . get_post_meta($order->id, 'Custom Field', true) . '</p>';
}
add_action('woocommerce_order_details_after_order_table', 'display_custom_checkout_field');