function modulus($a, $b) { if (validateZero($b)) { return errorMessages($a, $b, 'divide by zero'); } elseif (validateNumber($a, $b)) { return $a % $b; } }
function modulus($a, $b) { if (!validateAB($a, $b)) { return errorMessage($a, $b, 'not a number'); } elseif (validateZero($b)) { return errorMessage($a, $b, 'dividing by zero'); } else { return $a % $b; } }
function divide($a, $b) { if (validateZero($b)) { return "ERROR: You can't divide by 0, dummy. You entered in ({$a}, {$b})!" . PHP_EOL; } elseif (validateNumbers($a, $b)) { return $a / $b; } else { return displayError($a, $b, 'divide'); } }