I want to rename the WooCommerce’s “order” label in admin and email to something else.

I want to use “Booking” as replacement for “order”

I have a custom code snippet to do this but couldn’t work, yet broke down the site and have fatal error.

Here’s the code I tried!

<?php 
// Change "Order" to "Booking" in the admin menu
function change_order_to_booking_admin_menu() {
    global $menu;
    global $submenu;

    foreach ($menu as $key => $value) {
        if ($menu[$key][0] == 'Orders') {
            $menu[$key][0] = 'Bookings';
        }
    }

    if (isset($submenu['edit.php?post_type=shop_order'])) {
        foreach ($submenu['edit.php?post_type=shop_order'] as $key => $value) {
            if ($submenu['edit.php?post_type=shop_order'][$key][0] == 'Orders') {
                $submenu['edit.php?post_type=shop_order'][$key][0] = 'Bookings';
            }
        }
    }
}
add_action('admin_menu', 'change_order_to_booking_admin_menu', 999);

// Change "Order" to "Booking" in post type labels
function change_order_to_booking_post_type_labels( $labels ) {
    $labels->name = 'Bookings';
    $labels->singular_name = 'Booking';
    $labels->add_new = 'Add Booking';
    $labels->add_new_item = 'Add New Booking';
    $labels->edit_item = 'Edit Booking';
    $labels->new_item = 'New Booking';
    $labels->view_item = 'View Booking';
    $labels->search_items = 'Search Bookings';
    $labels->not_found = 'No Bookings found';
    $labels->not_found_in_trash = 'No Bookings found in trash';
    $labels->all_items = 'All Bookings';
    $labels->menu_name = 'Bookings';
    $labels->name_admin_bar = 'Booking';

    return $labels;
}
add_filter('woocommerce_register_post_type_shop_order', 'change_order_to_booking_post_type_labels');

// Change email subject and heading
function change_order_to_booking_email_subject( $subject, $order ) {
    $search = array( 'Order', 'order' );
    $replace = array( 'Booking', 'booking' );
    return str_replace( $search, $replace, $subject );
}
add_filter('woocommerce_email_subject_new_order', 'change_order_to_booking_email_subject', 10, 2);
add_filter('woocommerce_email_subject_customer_processing_order', 'change_order_to_booking_email_subject', 10, 2);
add_filter('woocommerce_email_subject_customer_completed_order', 'change_order_to_booking_email_subject', 10, 2);

function change_order_to_booking_email_heading( $heading, $email ) {
    $search = array( 'Order', 'order' );
    $replace = array( 'Booking', 'booking' );
    return str_replace( $search, $replace, $heading );
}
add_filter('woocommerce_email_heading_new_order', 'change_order_to_booking_email_heading', 10, 2);
add_filter('woocommerce_email_heading_customer_processing_order', 'change_order_to_booking_email_heading', 10, 2);
add_filter('woocommerce_email_heading_customer_completed_order', 'change_order_to_booking_email_heading', 10, 2);