Send WooCommerce email notifications to billing and user email address

Question

I wanted to use woocommerce_mail_headers filter to send custom emails to billing email address and user email address.

I read a lot of different posts about this issue on the last days but i was not able to find a working solution.

The following code is ok when $cc_email and $user_name are predefined but not when they are variable (depending on $order).

my_custom_email is the id of my email template (very close to WooCommerce email ones)

add_filter( 'woocommerce_email_headers', 'cc_user_function', 10, 3);
 
function cc_user_function($headers, $email_id, $order) {
       
    if ($email_id == 'my_custom_email'){
         $order_nr = wc_get_order( $order );
         $user_id   = $order_nr->get_user_id();
        $cc_email = get_userdata($user_id)->user_email ;
      
           $user_name  = $user->get_first_name().' ';
           $user_name .= $user->get_last_name();

    $formatted_email = utf8_decode($user_name . ' <' . $cc_email . '>');

    $headers .= 'Cc: '.$formatted_email .'\r\n';
}

            return $headers;
}

Can you help me to solve this problem?

Answer 1

To get an instance of the WP_User object you can use $order->get_user()

So you get:

function filter_woocommerce_email_headers( $header, $email_id, $order ) {
    // For a given email id & user id exists (no guests)
    if ( $email_id == 'customer_on_hold_order' && $order->get_user_id() > 0 ) {
        // Get an instance of the WP_User object
        $user = $order->get_user();
        
        // Get user email
        $user_email = $user->user_email;
        
        // Get first & last name
        $user_name = $user->first_name . ' ';
        $user_name .= $user->last_name;
    
        // Prepare the the data
        $formatted_email = utf8_decode( $user_name . ' <' . $user_email . '>' );

        // Add Cc to headers
        $header .= 'Cc: ' . $formatted_email . '\r\n';
    }

    return $header;
}
add_filter( 'woocommerce_email_headers', 'filter_woocommerce_email_headers', 10, 3 );