NoIndex WooCommerce 'Order by' archives - via PHP

functions.php

// Woocommerce SEO — Noindex 'Order by' archives
// Prevent indexing "Order by"
add_action( 'wp_head', 'woo_prevent_indexing_orderby' );

if(!function_exists('woo_prevent_indexing_orderby')){
    function woo_prevent_indexing_orderby () {
        if (isset($_GET['orderby'])){
            echo '<meta name="robots" content="noindex, nofollow">';
        }
    }
}