How to print a custom checkout field into email order details - php

Question

I would like print my custom checkout field into all e-mail notification, like in screenshot below.
What works so far
Add the field to the checkout
Process the checkout
Update the order meta with field value
Display field value on the order edit page
My question
How to add the custom checkout field into email order details (as seen in the screenshot)
Here is my code that I have used so far, how can I further adjust it?
/* Add the field to the checkout */
add_action( 'woocommerce_after_order_notes', 'my_custom_checkout_field' );
function my_custom_checkout_field( $checkout ) {
echo '<div id="my_custom_checkout_field"><h3>' . __('Imię i nazwisko osoby obdarowanej') . '</h3>';
woocommerce_form_field( 'my_field_name', array(
'type' => 'text',
'class' => array('my-field-class form-row-wide'),
'label' => __('Podaj imię i nazwisko osoby obdarowanej'),
'placeholder' => __(''),
'required' => true,
), $checkout->get_value( 'my_field_name' ));
echo '</div>';
}
/* Process the checkout */
add_action('woocommerce_checkout_process', 'my_custom_checkout_field_process');
function my_custom_checkout_field_process() {
// Check if set, if its not set add an error.
if ( ! $_POST['my_field_name'] )
wc_add_notice( __( '<strong>Imię i nazwisko osoby obdarowanej</strong> jest wymaganym polem' ), 'error' );
}
/* Update the order meta with field value */
add_action( 'woocommerce_checkout_update_order_meta', 'my_custom_checkout_field_update_order_meta' );
function my_custom_checkout_field_update_order_meta( $order_id ) {
if ( ! empty( $_POST['my_field_name'] ) ) {
update_post_meta( $order_id, 'My Field', sanitize_text_field( $_POST['my_field_name'] ) );
}
}
/* Display field value on the order edit page */
add_action( 'woocommerce_admin_order_data_after_billing_address', 'my_custom_checkout_field_display_admin_order_meta', 10, 1 );
function my_custom_checkout_field_display_admin_order_meta($order){
echo '<p><strong>'.__('Imie i nazwisko obdarowanej').':</strong> ' . get_post_meta( $order->id, 'My Field', true ) . '</p>';
}

Answer 1

Step 1) Change your code to this
/* Add the field to the checkout */
add_action( 'woocommerce_after_order_notes', 'my_custom_checkout_field' );
function my_custom_checkout_field( $checkout ) {
echo '<div id="my_custom_checkout_field"><h3>' . __('Imię i nazwisko osoby obdarowanej') . '</h3>';
woocommerce_form_field( 'my_field_name', array(
'type' => 'text',
'class' => array('my-field-class form-row-wide'),
'label' => __('Podaj imię i nazwisko osoby obdarowanej'),
'placeholder' => __(''),
'required' => true,
), $checkout->get_value( 'my_field_name' ));
echo '</div>';
}
/* Process the checkout */
add_action('woocommerce_checkout_process', 'my_custom_checkout_field_process');
function my_custom_checkout_field_process() {
// Check if set, if its not set add an error.
if ( ! $_POST['my_field_name'] )
wc_add_notice( __( '<strong>Imię i nazwisko osoby obdarowanej</strong> jest wymaganym polem' ), 'error' );
}
/* Update the order meta with field value */
add_action( 'woocommerce_checkout_create_order', 'my_custom_checkout_field_create_order', 10, 2 );
function my_custom_checkout_field_create_order( $order, $data ) {
if ( ! empty( $_POST['my_field_name'] ) ) {
$order->update_meta_data( '_my_field', sanitize_text_field( $_POST['my_field_name'] ) ); // Order meta data
}
}
/* Display field value on the order edit page */
add_action( 'woocommerce_admin_order_data_after_billing_address', 'my_custom_checkout_field_display_admin_order_meta', 10, 1 );
function my_custom_checkout_field_display_admin_order_meta($order) {
// Get meta
$my_field = $order->get_meta( '_my_field' );
echo '<p><strong>'.__('Imie i nazwisko obdarowanej').':</strong> ' . $my_field . '</p>';
}
Step 2) overwrite the following template file
https://github.com/woocommerce/woocommerce/blob/3.8.0/templates/emails/email-order-details.php
This template can be overridden by copying it to
yourtheme/woocommerce/emails/email-order-details.php.
Add the following code under line number 84
$my_field = $order->get_meta( '_my_field' );
if ( isset( $my_field ) ) {
?>
<tr>
<th class="td" scope="row" colspan="2" style="text-align:<?php echo esc_attr( $text_align ); ?>;"><?php echo 'Imie i nazwisko obdarowanej:'; ?></th>
<td class="td" style="text-align:<?php echo esc_attr( $text_align ); ?>;"><?php echo $my_field; ?></td>
</tr>
<?php
}