Display cross-sells on the product pages

add_action( 'woocommerce_after_single_product_summary', function() {

	global $product;

	$limit = 4;
	$columns = 4;
	$orderby = 'rand';
	$order = 'desc';

    $cross_sells = array_filter(
		array_map( 'wc_get_product', $product->get_cross_sell_ids() ),
		'wc_products_array_filter_visible'
	);

    wc_set_loop_prop( 'name', 'cross-sells' );
    wc_set_loop_prop( 'columns', apply_filters( 'woocommerce_cross_sells_columns', $columns ) );

    $orderby = apply_filters( 'woocommerce_cross_sells_orderby', $orderby );
    $order = apply_filters( 'woocommerce_cross_sells_order', $order );
    $cross_sells = wc_products_array_orderby( $cross_sells, $orderby, $order );
    $limit = apply_filters( 'woocommerce_cross_sells_total', $limit );
    $cross_sells = $limit > 0 ? array_slice( $cross_sells, 0, $limit ) : $cross_sells;

    wc_get_template(
        'cart/cross-sells.php',
        array(
            'cross_sells' => $cross_sells,
            'posts_per_page' => $limit,
            'orderby' => $orderby,
            'columns' => $columns,
        )
    );

}, 15 );