public function isFizz(number)
{
return number % 3;
}
public function isBuzz(number)
{
return number % 5;
}
...
if (isFizz(number))
echo 'Fizz';
if (isBuzz(number))
echo 'Buzz';
if (!isFizz(number) || !isBuzz(number))
echo number;
echo '<br>';