Update 2: 添加了对 Woocommerce 3+ 的兼容性并删除了一些错误
正如您所期望的,这里可以是一个更完整的解决方案:
// Outputting the hidden field in checkout page
add_action( 'woocommerce_after_order_notes', 'add_custom_checkout_hidden_field' );
function add_custom_checkout_hidden_field( $checkout ) {
// Generating the VID number
$vid_number = wp_rand(10000,99999);
// Output the hidden field
echo '<div id="user_link_hidden_checkout_field">
<input type="hidden" class="input-hidden" name="billing_vid" id="billing_vid" value="' . $vid_number . '">
</div>';
}
// Saving the hidden field value in the order metadata
add_action( 'woocommerce_checkout_update_order_meta', 'save_custom_checkout_hidden_field' );
function save_custom_checkout_hidden_field( $order_id ) {
if ( ! empty( $_POST['billing_vid'] ) ) {
update_post_meta( $order_id, '_billing_vid', sanitize_text_field( $_POST['billing_vid'] ) );
}
}
// Displaying "Verification ID" in customer order
add_action( 'woocommerce_order_details_after_customer_details', 'display_verification_id_in_customer_order', 10 );
function display_verification_id_in_customer_order( $order ) {
// compatibility with WC +3
$order_id = method_exists( $order, 'get_id' ) ? $order->get_id() : $order->id;
echo '<p class="verification-id"><strong>'.__('Verification ID', 'woocommerce') . ':</strong> ' . get_post_meta( $order_id, '_billing_vid', true ) .'</p>';
}
// Display "Verification ID" on Admin order edit page
add_action( 'woocommerce_admin_order_data_after_billing_address', 'display_verification_id_in_admin_order_meta', 10, 1 );
function display_verification_id_in_admin_order_meta( $order ) {
// compatibility with WC +3
$order_id = method_exists( $order, 'get_id' ) ? $order->get_id() : $order->id;
echo '<p><strong>'.__('Verification ID', 'woocommerce').':</strong> ' . get_post_meta( $order_id, '_billing_vid', true ) . '</p>';
}
// Displaying "Verification ID" on email notifications
add_action('woocommerce_email_customer_details','add_verification_id_to_emails_notifications', 15, 4 );
function add_verification_id_to_emails_notifications( $order, $sent_to_admin, $plain_text, $email ) {
// compatibility with WC +3
$order_id = method_exists( $order, 'get_id' ) ? $order->get_id() : $order->id;
$output = '';
$billing_vid = get_post_meta( $order_id, '_billing_vid', true );
if ( !empty($billing_vid) )
$output .= '<div><strong>' . __( "Verification ID:", "woocommerce" ) . '</strong> <span class="text">' . $billing_vid . '</span></div>';
echo $output;
}
该代码位于活动子主题(或主题)的 function.php 文件中或任何插件文件中。
这段代码已经过测试并且可以工作。