qdr.app.woo.plugins/studiou-wc-ord-print-statuses/includes/class-custom-columns-manager.php

<?php
//Manages custom columns in the order list.
// visualized

class Custom_Columns_Manager {
    public function __construct() {
        add_filter('manage_woocommerce_page_wc-orders_columns', array($this, 'add_custom_shop_order_column'));
        add_action('manage_woocommerce_page_wc-orders_custom_column', array($this, 'add_custom_shop_order_column_content'), 10, 2);
    }

    public function add_custom_shop_order_column($columns) {
        $new_columns = array();

        foreach ($columns as $column_name => $column_info) {
            $new_columns[$column_name] = $column_info;

            if ($column_name === 'order_total') {
                $new_columns['to_print_date'] = __('To Print Date', 'studiou-wc-ord-print-statuses');
                $new_columns['in_print_date'] = __('In Print Date', 'studiou-wc-ord-print-statuses');
                $new_columns['external_order_number'] = __('External Order Number', 'studiou-wc-ord-print-statuses');
            }
        }

        return $new_columns;
    }

    public function add_custom_shop_order_column_content($column, $post_id) {
        $order = wc_get_order($post_id);

        switch ($column) {
            case 'to_print_date':
                $to_print_date = $order->get_meta('to_print_date');
                echo $to_print_date ? date_i18n(get_option('date_format') . ' ' . get_option('time_format'), strtotime($to_print_date)) : '—';
                break;

            case 'in_print_date':
                $in_print_date = $order->get_meta('in_print_date');
                echo $in_print_date ? date_i18n(get_option('date_format') . ' ' . get_option('time_format'), strtotime($in_print_date)) : '—';
                break;

            case 'external_order_number':
                echo $order->get_meta('external_ref_ord_no') ?: '—';
                break;
        }
    }
}