WebServ/www/public/M2/04/math.php

<?php
    function sum($num1, $num2) {
        return $num1 + $num2;
    }

    function substract($num1, $num2) {
        return $num1 - $num2;
    }

    function multiply($num1, $num2) {
        return $num1 * $num2;
    }

    function divide($num1, $num2) {
        return $num1 / $num2;
    }

?>