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<?php /* by William Lucking (will@ahnet.net) of Affinity Hosting, LLC, offering low cost hosting providing UNIX accounts supporting PHP3, PHP2, and mySQL (no telnet access). We are always hiring PHP programmers in the Los Angeles area, full and part-time. This suite offers many financial management functions that can be used (but not limited) for a web based mortgage or loan calculator. Need some Financial Management training: http://www.duke.edu/~charvey/Classes/ba350_1997/preassignment/preassign.htm VARIABLES: $m = number of periods per year. For instance, if you are For instance, if you are making payments monthly then this number is 12. $n = total number of periods. For instance, if you are compounding monthly for 5 years, this number would be 60 (12 months x 5 years). $R = annual interest rate (represented as a decimal, 8% = .08) $pmt = first or re-occuring payment or receipt (this number cannot vary for differing cash flows) $principal = present value of an annuity, or current principal of a loan used in the PaymentCalc function */ // present value of an Annuity // uses include defining Remaining Principal of a loan/mortgage function PVannuity ($m,$n,$R,$pmt) { $Z = 1 / (1 + ($R/$m)); return ($pmt * $Z * (1 - pow($Z,$n)))/(1 - $Z); } // Given the compounding, principal, interest rate, you can calculate the monthly payment function PaymentCalc ($m,$n,$R,$principal) { $Z = 1 / (1 + ($R/$m)); return ((1 - $Z) * $principal) / ($Z * (1 - pow($Z,$n))); } // future value of an Annuity function FVannuity ($m,$n,$R,$pmt) { return $pmt * ((pow((1 + $R/$n),$m) - 1)/($R/$n)); } // present value of a single payment function PVsingle ($m,$n,$R,$pmt) { return $pmt * pow((1 + $R/$m),-$n); } // future value of a single payment function FVsingle ($m,$n,$R,$pmt) { return $pmt * pow((1 + $R/$m),$n); } // future value of a single payment with continuous compounding function FVperp ($m,$n,$R,$pmt) { return $pmt * exp($R * ($n/$m)); } ?> | |||||
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