WooCommerce: Ship One Category of Products to Certain States

Plugin Modification

<?php
/**
 * Plugin Name: WooCommerce Only Ship to Continental US
 * Plugin URI: https://gist.github.com/BFTrick/7805588
 * Description: Only Ship to the Continental US
 * Author: Patrick Rauland
 * Author URI: http://patrickrauland.com/
 * Version: 1.0.1
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 *
 * @author              Patrick Rauland
 * @since               1.0.1
 */

/**
* Only ship to the continental US
*
* @param array $available_methods
*/
function patricks_only_ship_to_continental_us( $available_methods ) {
        global $woocommerce;

        // List states excluded
        $excluded_states = array( 'AL','AK','AZ','AR','CA','CO','CT','DC','DE','FL','GA','HI','ID','IL','IN','IA','KS','KY','LA','ME','MD','MI','MN','MS','MO','MT','NE','NV','NJ','NM','NY','NC','ND','OH','OK','OR','PA','PR','RI','SC','SD','TN','TX','UT','VT','VA','VI','WA','WV','WI','WY' );

        // start of the loop that fetches the cart items
        foreach ( $woocommerce-&gt;cart-&gt;get_cart() as $cart_item_key =&gt; $values ) {
    $_product = $values['data'];
        $terms = get_the_terms( $_product-&gt;id, 'product_cat' );
        // second level loop search, in case some items have several categories
        foreach ($terms as $term) {
                $_categoryid = $term-&gt;term_id;
            }

    if (( $_categoryid === 33 )) {
        //category is in cart!
        $product_in_cart = true;
    }
}

        if( in_array( $woocommerce-&gt;customer-&gt;get_shipping_state(), $excluded_states ) &amp;&amp; ($product_in_cart === true) ) {
                // Empty the $available_methods array
                $available_methods = array();
        }

        return $available_methods;
}
add_filter( 'woocommerce_package_rates', 'patricks_only_ship_to_continental_us', 10 );