function calculateFee($Age = 0, $FamilyDiscount = '-', $Airbed = 0, $AirportTransfer = 0, $Pensioner = 0, $EarlyBirdSpecial = 0) { //create a calculator objcet $calculator = new FeeCalculator(); //use object to calculate fee return $calculator->calculateFee($Age, $FamilyDiscount, $Airbed, $AirportTransfer, $Pensioner, $EarlyBirdSpecial); }