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

<?php
/**
 * Extends WooCommerce order search to find orders by external_ref_ord_no.
 *
 * The hooks below cover both legacy (CPT) and HPOS storage modes. They make the
 * existing "Search orders" input also match the external reference number meta
 * — no additional UI is required.
 */

defined('ABSPATH') || exit;

class Order_Search_Manager {
    const META_KEY = 'external_ref_ord_no';

    public function __construct() {
        // Legacy CPT-backed storage: WC includes these post-meta keys in the search query.
        add_filter('woocommerce_shop_order_search_fields', array($this, 'add_meta_key_to_search'));

        // HPOS-backed storage: WC searches order meta listed here.
        add_filter('woocommerce_order_table_search_query_meta_keys', array($this, 'add_meta_key_to_search'));
    }

    /**
     * Append the external reference meta key to whichever list WC passes us.
     * Same callback works for both filters above.
     *
     * @param array $keys Meta keys / search fields collected by WC.
     * @return array
     */
    public function add_meta_key_to_search($keys) {
        if (!is_array($keys)) {
            $keys = array();
        }
        if (!in_array(self::META_KEY, $keys, true)) {
            $keys[] = self::META_KEY;
        }
        return $keys;
    }
}