Codeup-Exercises/arithmetic.php at master · kcates81/Codeup-Exercises · GitHub

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<?php

function throwErrorMessage ($a, $b)
{
    return "DANGER! DANGER, WILL ROBINSON! Either {$a} or {$b} is not a number!\n";
}

function add($a, $b)
{
    if (is_numeric($a) && is_numeric($b)) {
        return $a + $b;
    } else {
        echo throwErrorMessage ($a, $b);
    }
}

function subtract($a, $b)
{
    if (is_numeric($a) && is_numeric($b)) {
        return $a - $b;
    } else {
        echo throwErrorMessage ($a, $b);
    }
}

function multiply($a, $b)
{
    if (is_numeric($a) && is_numeric($b)) {
        return $a * $b;
    } else {
        echo throwErrorMessage ($a, $b);
    }
}

function divide($a, $b)
{
    if ($b == 0) {
        return "Uhuh...you can't do that!\n";
    }elseif (is_numeric($a) && is_numeric($b)){
        return $a / $b;
    } else {
       echo throwErrorMessage ($a, $b);
    }
}

function modulus ($a, $b)
{
    if (is_numeric($a) && is_numeric($b)) {
        return $a % $b;
    } else {
      echo throwErrorMessage ($a, $b);
    }
}

// Add code to test your functions here

echo add(5, '5').PHP_EOL;

echo subtract(5, false).PHP_EOL;

echo multiply(5, 'poop').PHP_EOL;

echo divide(5, 0). PHP_EOL;

echo modulus(true, 5). PHP_EOL;