PHP AND Statement

I have some code for a plugin that is doing an AND statement to work out the data['type'] and then use that in a switch statement as follows;

        if($data['type'] != 'Cartthrob_discount_percentage_off_product' AND $data['type'] != 'Cartthrob_discount_percentage_off') continue;

        switch($data['type']) {
            case 'Cartthrob_discount_amount_off_product' :
                // Is this coupon applied to this item?
                $coupon_entry_ids = explode(',', $data['entry_ids']);
                if(in_array($row['id'], $coupon_entry_ids))
                {
                    // Valid and applied to this product
                    $discount_applied = $discount_applied + $data['amount_off'];
                }
            break;

            // Percentage Off a Single Product
            case 'Cartthrob_discount_percentage_off_product' :
              $percentage_off = $data['percentage_off'];
                $discount = 0;
                // Is this coupon applied to this item?
                $coupon_entry_ids = explode(',', $data['entry_ids']);
                if(in_array($row['id'], $coupon_entry_ids))
                {
                    // Valid and applied to this product
                    //$discount = round($row['id'] * ( $data['percentage_off'] / 100 ), 2, PHP_ROUND_HALF_UP);
                    $discount = round($row['price_before_tax'] * ( $data['percentage_off'] / 100 ), 2, PHP_ROUND_HALF_UP);
                    $discount_applied = $discount_applied + $discount;
                }
            break;

            case 'Cartthrob_discount_percentage_off' :

                $percentage_off = $data['percentage_off'];
                $discount = 0;
                // discounts are calculated against pre tax price
                $discount = round($row['price_before_tax'] * ( $data['percentage_off'] / 100 ), 2, PHP_ROUND_HALF_UP);

                $discount_applied = $discount_applied + $discount;

            break;
        }

This is working fine, but i need to add a check for two further data['type]'s with that first line. I'm wondering if someone could help me change it so that I can add in a check for all of the following data types;

Cartthrob_discount_amount_off_product Cartthrob_discount_percentage_off Cartthrob_discount_percentage_off_product Cartthrob_discount_amount_off_over_x

Thanks, Neil