02c04-4.php

介绍PHP5的给类型函数应用

<?php
// Calculating Continuous Compound Interest:
// a = the initial amount you are calculating from
// r = the annual percentage rate
// y = the number of years you wish to calculate this for:
function calc_continuous_compound_interest($a, $r, $y) {
	return $a * pow(M_E, $r * $y);
}

// Calculate the value of $5000, at 3.25% interest, compounded daily, 
//  for 3 years.   Answer: 5512.0572078166
echo calc_continuous_compound_interest(5000, .0325, 3), '<br />';

// Calculate the value of $1000, at 8.5% interest, compounded monthly,
// for 6 months.   Answer: 1043.4160563737
echo calc_continuous_compound_interest(1000, .085, .5);
?>