Limit order search fields in WooCommerce for speed optimization

limit-order-searches.php

<?php 

/**
 * Class Limit_Order_Search_Fields
 * 
 * Limits WooCommerce order searches to email, phone, order ID, shipping & billing address indexes and name
 * for admins and shop managers to limit optimize speed in order search.
 * 
 * Installation:  Place this file in the mu-plugins folder.
 *                If you do not have a mu-plugins folder you can create one in the wp-content folder.
 *                No activation is needed and the plugin will work immediately.
 * 
 * Author: Daniel Leis 
 * Version: 1.0
 */
class Limit_Order_Search_Fields {

    /**
     * Constructor for the Limit_Search class.
     * 
     * This constructor checks if the current user has the capability to manage options or manage WooCommerce,
     * and if the current page is the admin page for shop orders in WooCommerce.
     * If the conditions are met, it adds a filter to limit the search fields for shop orders in WooCommerce.
     */
    public function __construct() {
        if (
            (current_user_can('manage_options') || current_user_can('manage_woocommerce'))
            && (is_admin() && class_exists('woocommerce') && isset($_GET['post_type']) && $_GET['post_type'] === 'shop_order')
        ) {
            add_filter('woocommerce_shop_order_search_fields', array($this, 'limit_order_search_fields'));
        }
    }
    
    /**
     * Limits the search fields for order search.
     *
     * This function is used to limit the search fields for order search in WordPress.
     * It sets the specific fields that will be used for searching orders.
     *
     * @param array $search_fields The array of search fields.
     * @return array The modified array of search fields.
     */
    public function limit_order_search_fields(array $search_fields) {
        $search_fields = array(
            '_billing_address_index',
            '_shipping_address_index',
            '_billing_first_name',
            '_billing_last_name',
            '_billing_email',
            '_billing_phone',
            'ID'
        );
        return $search_fields;
    }

}


/**
 * Adds an action to the 'init' hook to initialize the Limit_Order_Search_Fields class.
 * This is needed to get access to current user capabilities, current page and post type functions.
 */
add_action('init', function(){
    new Limit_Order_Search_Fields();
});