[WooCommerce] Sort the shipping prices by cost

wc-sort-price-cost.php

add_filter( 'woocommerce_package_rates' , 'sort_woocommerce_available_shipping_methods_by_cost', 10, 2 );
function sort_woocommerce_available_shipping_methods_by_cost( $rates, $package ) {
    if ( ! $rates ) {
        return;
    }

    $tmp = array();
    foreach( $rates as $rate ) {
        $tmp[] = $rate->cost;
    }

    array_multisort( $tmp, SORT_ASC, $rates );

    return $rates;
}