Codeup-Exercises/arithmetic.php at master · garridoalex77/Codeup-Exercises · GitHub

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<?php

function throwErrorMessage($a, $b) {
    return "Error both arguments must be numbers, value \$a : {$a}, \$b : {$b}";
}

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 "don't divide by 0, value \$a : {$a}, \$b : {$b}";
    } 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('dog', 21).PHP_EOL;
echo subtract(65, 33).PHP_EOL;
echo multiply(3, 3).PHP_EOL;
echo divide(99, 0).PHP_EOL;
echo modulus(55, 7).PHP_EOL;