[UPS Shipping Method] remove UPS as a shipping option for specific shipping classes

ups-remove-shipping-for-specific-classes.php

/**
 * Check the cart for specific classes, remove UPS Shipping method if they are present
 * 
 * REMOVE THE TOP <?php if there is no ?> before (or you have an error after adding this)
 * 
 * Add the code to your theme functions.php file
 */
add_filter( 'woocommerce_package_rates', 'unset_ups_shipping_method' , 10, 2 );
function unset_ups_shipping_method( $rates, $package ) {
 
    // Setup an array of shipping classes that do not allow UPS Shipping (@todo change this)
    $shippingclass_array = array( 'no-ups' );
 
    /**
     * loop through the cart looking for the products in the array above
     * and unset the Free shipping methods as necessary
     */ 
    foreach ( WC()->cart->get_cart() as $cart_item_key => $values ) {
        $shipping_class = get_the_terms( $values['product_id'], 'product_shipping_class' );

        if ( isset( $shipping_class[0]->slug ) && in_array( $shipping_class[0]->slug, $shippingclass_array ) ) {
            /**
             * Unset the shipping methods here
             */
            unset( $rates['ups:01'] );
            unset( $rates['ups:02'] );
            unset( $rates['ups:03'] );
            unset( $rates['ups:04'] );
            unset( $rates['ups:05'] );
            unset( $rates['ups:06'] );
            unset( $rates['ups:07'] );
            unset( $rates['ups:08'] );
            unset( $rates['ups:09'] );
            unset( $rates['ups:10'] );
            unset( $rates['ups:11'] );
            unset( $rates['ups:12'] );
            unset( $rates['ups:13'] );
            unset( $rates['ups:14'] );
            unset( $rates['ups:15'] );
 
            // The rates have been removed, no point in carrying on
            //break;
        }
    }
 
    // Return what's left of the $rates array
    return $rates;
}