I already have a function that finds the GCD of 2 numbers.

```
function getGCDBetween($a, $b)
{
    while ($b != 0)
    {
        $m = $a % $b;
        $a = $b;
        $b = $m;
    }
    return $a;
}

```

But now, I would like to extend this function to find the GCD of N points. Any suggestion ?