How to add a custom or new order status in woocommerce wordpress

For add a custom or new order status in woocommerce store. just copy and paste below code into your theme's functions.php or in your custom plugins file.

For example i am add a shipping order status for order .

// register post status wc-shipping
add_action('init','register_shipping_post_status');
function register_shipping_post_status(){
        register_post_status( 'wc-shipping', array(
            'label'                     => 'Shipping',
            'public'                    => true,
            'exclude_from_search'       => false,
            'show_in_admin_all_list'    => true,
            'show_in_admin_status_list' => true,
            'label_count'               => _n_noop( 'Shipping <span class="count">(%s)</span>', 'Shipping <span class="count">(%s)</span>' )
        ) );
    }

Now for add a shipping status into order status's dropdown use below code.

add_filter( 'wc_order_statuses','add_shipping_to_order_statuses' );
function add_shipping_to_order_statuses( $order_statuses ) {
        $new_order_statuses = array();
        // add new order status after processing
        foreach ( $order_statuses as $key => $status ) {
            $new_order_statuses[ $key ] = $status;
            if ( 'wc-processing' === $key ) {
                $new_order_statuses['wc-shipping'] = 'Shipping';
            }
        }
        return $new_order_statuses;
    }