FoxyShop Pricing Adjustment for Logged In Users

//Wholesale Pricing
if (is_user_logged_in()) {
    add_filter("foxyshop_price_adjustment", "wholesale_price_adjust");
    add_filter("foxyshop_variation_adjustment", "wholesale_variation_adjust");
}

function wholesale_price_adjust($price) {
    return $price * .8;
}

function wholesale_variation_adjust($val) {

    if (strpos($val,"{") !== false) {
        $variation_display_name = substr($val,0,strpos($val,"{"));
        $variation_modifiers = substr($val, strpos($val,"{")+1, strpos($val,"}") - (strpos($val,"{")+1));

        $arr_variation_modifiers = explode("|",$variation_modifiers);
        foreach ($arr_variation_modifiers as $key => $individual_modifier) {
            $individual_modifier = trim($individual_modifier);

            //Straight Price
            if (strtolower(substr($individual_modifier, 0, 2)) == "p:") {
                $price = substr($individual_modifier, 2);
                $arr_variation_modifiers[$key] = "p:" . ($price * .8);

            //Price Addition
            } elseif (strtolower(substr($individual_modifier, 0, 2)) == "p+") {
                $price = substr($individual_modifier, 2);
                $arr_variation_modifiers[$key] = "p+" . ($price * .8);

            //Price Subtraction
            } elseif (strtolower(substr($individual_modifier, 0, 2)) == "p-") {
                $price = substr($individual_modifier, 2);
                $arr_variation_modifiers[$key] = "p-" . ($price * .8);

            }
        }
        $val = $variation_display_name . "{" . implode("|", $arr_variation_modifiers) . "}";
    }
    return $val;
}