WooCommerce Exclude Free Shipping For Specific User Roles

Exclude Free Shipping

<?php

/* Free shipping for non-stockists
 * Adapted from Sean Barton's snippet
 * http://www.sean-barton.co.uk/2014/04/wordpress-snippet-woocommerce-free-shipping-role/#.VW_FaVyqpBc
 * Click "Clear transients" (WooCommerce > System Status > Tools) if it's not working.
 */

add_filter( 'woocommerce_package_rates', 'my_woocommerce_set_free_shipping_for_certain_users', 10, 1);

function my_woocommerce_set_free_shipping_for_certain_users( $rates, $package ) {
    get_currentuserinfo();
    global $current_user;
    
    if ($current_user->ID) {
        $user_roles = $current_user->roles;
        $user_role = array_shift($user_roles);
        
        if ($user_role == 'stockist') {
            unset($rates['free_shipping']);
        } else {
            $freeshipping = $rates['free_shipping'];
     
            $rates = array();
            $rates[] = $freeshipping;
        }
    }
    
    return $rates;
}