1. The first function named add_backorder_order_status is defining a new order status called “On Backorder.”

Here’s what each part does:

    1. register_post_status('wc-on-backorder', ...) creates the new order status and gives it a unique identifier ‘wc-on-backorder.’
    2. 'label' specifies the name of the status, which is “On Backorder.”
    3. 'public' is set to true, meaning this status can be seen by customers on the website.
    4. 'exclude_from_search' is set to false, so products with this status will not be excluded from search results.
    5. 'show_in_admin_all_list' and 'show_in_admin_status_list' both set to true, which means it will appear in the list of orders in the admin dashboard.
    6. 'label_count' provides the text for displaying the count of orders with this status.
  2. The second function named show_backorder_order_status is used to make this new status translatable (it can be displayed in different languages). It takes the existing $order_statuses array and adds the “On Backorder” status to it, making it available in different languages if needed.
  3. Finally, the code adds an action and filter:
    • add_action('init', 'add_backorder_order_status') hooks the first function to the ‘init’ action, so when the website initializes, it adds the “On Backorder” status.
    • add_filter('wc_order_statuses', 'show_backorder_order_status') hooks the second function to the ‘wc_order_statuses’ filter, allowing it to modify the list of order statuses.

In simple terms, this code creates a new order status called “On Backorder” in a WooCommerce store, making it visible to both customers and administrators. It also ensures that this status can be translated into different languages if needed.

<?php

function add_backorder_order_status() {
    register_post_status('wc-on-backorder', array(
        'label'                     => 'On Backorder',
        'public'                    => true,
        'exclude_from_search'       => false,
        'show_in_admin_all_list'    => true,
        'show_in_admin_status_list' => true,
        'label_count'               => _n_noop('On Backorder <span class="count">(%s)</span>', 'On Backorder <span class="count">(%s)</span>')
    ));
}
add_action('init', 'add_backorder_order_status');

function show_backorder_order_status( $order_statuses ) {
    $order_statuses['wc-on-backorder'] = _x('On Backorder', 'Order status', 'woocommerce');
    return $order_statuses;
}
add_filter('wc_order_statuses', 'show_backorder_order_status');