Add a custom text for a particular product on specific email notification in Woocommerce

Question

I want to add an extra text "There is an offer in this particular item etc" only for a particular product(Product Id:1) in customer-completed-order.php in WordPress. Other products no need to have this extra line. Can anybody help me to find out this?

 <?php
   /**
    * Customer completed order email
    *
    * This template can be overridden by copying it to yourtheme/woocommerce/emails/customer-completed-order.php.
    *
    * HOWEVER, on occasion WooCommerce will need to update template files and you
    * (the theme developer) will need to copy the new files to your theme to
    * maintain compatibility. We try to do this as little as possible, but it does
    * happen. When this occurs the version of the template file will be bumped and
    * the readme will list any important changes.
    *
    * @see https://docs.woocommerce.com/document/template-structure/
    * @package WooCommerce/Templates/Emails
    * @version 3.5.0
    */

   if ( ! defined( 'ABSPATH' ) ) {
    exit;
   }

   /*
    * @hooked WC_Emails::email_header() Output the email header
    */
   do_action( 'woocommerce_email_header', $email_heading, $email ); ?>
<?php /* translators: %s: Customer first name */ ?>
<p><?php printf( esc_html__( 'Hi %s,', 'woocommerce' ), esc_html( $order->get_billing_first_name() ) ); ?></p>
<?php /* translators: %s: Site title */ ?>
<p><?php printf( esc_html__( 'Your %s order has been marked complete on our side.', 'woocommerce' ), esc_html( wp_specialchars_decode( get_option( 'blogname' ), ENT_QUOTES ) ) ); ?></p>
<?php
   /*
    * @hooked WC_Emails::order_details() Shows the order details table.
    * @hooked WC_Structured_Data::generate_order_data() Generates structured data.
    * @hooked WC_Structured_Data::output_structured_data() Outputs structured data.
    * @since 2.5.0
    */
   do_action( 'woocommerce_email_order_details', $order, $sent_to_admin, $plain_text, $email );

   /*
    * @hooked WC_Emails::order_meta() Shows order meta data.
    */
   do_action( 'woocommerce_email_order_meta', $order, $sent_to_admin, $plain_text, $email );

   /*
    * @hooked WC_Emails::customer_details() Shows customer details
    * @hooked WC_Emails::email_address() Shows email address
    */
   do_action( 'woocommerce_email_customer_details', $order, $sent_to_admin, $plain_text, $email );

   ?>
<p>
   <?php esc_html_e( 'Thanks for shopping with us.', 'woocommerce' ); ?>
</p>
<?php
/*
* @hooked WC_Emails::email_footer() Output the email footer
*/
do_action( 'woocommerce_email_footer', $email );

Answer 1

The following will display a custom text under a order item name for a specific product in Customer Completed email notification:

// Setting the email_is as a global variable
add_action('woocommerce_email_before_order_table', 'the_email_id_as_a_global', 1, 4);
function the_email_id_as_a_global($order, $sent_to_admin, $plain_text, $email ){
    $GLOBALS['email_id_str'] = $email->id;
}

// Displaying product description in new email notifications
add_action( 'woocommerce_order_item_meta_end', 'product_description_in_new_email_notification', 10, 3 );
function product_description_in_new_email_notification( $item_id, $item, $order = null ){
    // HERE define your targetted product ID
    $targeted_id = 37;

    // HERE define the text information to be displayed for the targeted product id
    $text_information = __("There is an offer in this particular item", "woocommerce");

    // Getting the email ID global variable
    $refNameGlobalsVar = $GLOBALS;
    $email_id = $refNameGlobalsVar['email_id_str'];

    // If empty email ID we exit
    if(empty($email_id)) return;

    // Only for "New Order email notification" for your targeted product ID
    if ( 'customer_completed_order' == $email_id &&
        in_array( $targeted_id, array( $item->get_product_id(), $item->get_variation_id() ) ) ) {

        // Display the text
        echo '<div class="product-text" style="margin-top:10px"><p>' . $text_information . '</p></div>';
    }
}

Code goes in function.php file of your active child theme (active theme). Tested and works.