FoxyShop: Remove Out of Inventory Options

//Remove Out of Inventory Options From Product Variations
//This should go in your functions.php file
add_filter('foxyshop_setup_product_info', 'my_product_setup', 10, 2);
function my_product_setup($product_array, $product_id) {

    //Remove Variation Options with inventory count of 0
    foreach ($product_array['variations'] as $key => $variation) {

        $variation_list = preg_split("[\r\n|\r|\n]", $variation['value']);
        if (count($variation_list) > 0) {
            foreach ($variation_list as $var_key => $var_val) {
                $code = get_variation_code($var_val);
                if (!$code) continue;
                if (!check_product_code_inventory($code, $product_array['inventory_levels'])) {
                    unset($variation_list[$var_key]);
                }
            }
            $variation['value'] = implode("\n", $variation_list);
            $product_array['variations'][$key] = $variation;
        }
    }

    //Always return the new, complete array
    return $product_array;

}

function check_product_code_inventory($code, $inventory_array) {
    if (isset($inventory_array[$code])) {
        if ($inventory_array[$code]['count'] <= 0) {
            return false;
        }
    }
    return true;
}

function get_variation_code($source) {
    if (strpos($source,"{") === false) return "";

    //Isolate the Modifiers
    $variation_modifiers = substr($source, strpos($source,"{")+1, strpos($source,"}") - (strpos($source,"{")+1));
    $arr_variation_modifiers = explode("|",$variation_modifiers);

    //Loop Through Each Modifier
    foreach ($arr_variation_modifiers as $individual_modifier) {
        if (strtolower(substr($individual_modifier,0,2)) == "c:") {
            return substr($individual_modifier,2);
        }
    }

    //None Found
    return "";
}