Find Sell Price

When you need to find your sell price along with discount price 
    function getSalePrice($reg_price, $dis_amount, $dis_type) {
        if($dis_type){
          // if discount amount percentage(%)
          $sale_price  = (float)$reg_price - ((float)$reg_price * (float)$dis_amount/100);
          $sale_price  = round($sale_price, 2);
        } else{
            // if discount amount fixed
            $sale_price = (float)$reg_price - (float)$dis_amount;
        }

        return $sale_price;
    }