<?php
    class Reserve
    {
        private $isReserveCheck=FALSE;
        
        function calculate($face_value,$offer,$max_maturity_days,$days,$bankfee,$purchase_discount)
        {
            if($face_value<=0)
            {
                return 0;
            }
            
            $this->isReserveCheck=TRUE;
            return round(($face_value-$face_value*$offer*12*$days/360)-$bankfee-($face_value*$purchase_discount),2);
        }
        
        function getReserveCheck()
        {
            return $this->isReserveCheck;
        }
    }
?>