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

<?php
// Manages custom order fields.
// visualized

class Order_Fields_Manager {
    public function __construct() {
        add_action('woocommerce_admin_order_data_after_order_details', array($this, 'display_custom_order_fields'));
        add_action('woocommerce_process_shop_order_meta', array($this, 'save_custom_order_fields'));
    }

    public function display_custom_order_fields($order) {
        ?>
        <div class="order_data_column">
            <h4><?php _e('Print Information', 'studiou-wc-ord-print-statuses'); ?></h4>
            <?php
            woocommerce_wp_text_input(array(
                'id' => 'to_print_date',
                'label' => __('Prepare To Print Date', 'studiou-wc-ord-print-statuses'),
                'type' => 'datetime-local',
                'value' => $order->get_meta('to_print_date'),
                'wrapper_class' => 'form-field-wide'
            ));
            woocommerce_wp_text_input(array(
                'id' => 'in_print_date',
                'label' => __('In Print Date', 'studiou-wc-ord-print-statuses'),
                'type' => 'datetime-local',
                'value' => $order->get_meta('in_print_date'),
                'wrapper_class' => 'form-field-wide'
            ));
            woocommerce_wp_text_input(array(
                'id' => 'external_ref_ord_no',
                'label' => __('External Order Number', 'studiou-wc-ord-print-statuses'),
                'value' => $order->get_meta('external_ref_ord_no'),
                'wrapper_class' => 'form-field-wide'
            ));
            woocommerce_wp_text_input(array(
                'id' => 'external_ref_ord_delivered',
                'label' => __('External Order Delivered', 'studiou-wc-ord-print-statuses'),
                'type' => 'datetime-local',
                'value' => $order->get_meta('external_ref_ord_delivered'),
                'wrapper_class' => 'form-field-wide'
            ));
            ?>
        </div>
        <?php
    }

    public function save_custom_order_fields($order_id) {
        $order = wc_get_order($order_id);
        
        if (isset($_POST['to_print_date'])) {
            $order->update_meta_data('to_print_date', sanitize_text_field($_POST['to_print_date']));
        }
        if (isset($_POST['in_print_date'])) {
            $order->update_meta_data('in_print_date', sanitize_text_field($_POST['in_print_date']));
        }
        if (isset($_POST['external_ref_ord_no'])) {
            $order->update_meta_data('external_ref_ord_no', sanitize_text_field($_POST['external_ref_ord_no']));
        }
        if (isset($_POST['external_ref_ord_delivered'])) {
            $order->update_meta_data('external_ref_ord_delivered', sanitize_text_field($_POST['external_ref_ord_delivered']));
        }
        
        $order->save();
    }
}