```
if ($number % 6 != 0) {
$number += 6 - ($number % 6);
}
```

The modulus operator gives the remainder of the division, so $number % 6 is the amount left over when dividing by 6. This will be faster than doing a loop and continually rechecking.

If decreasing is acceptable then this is even faster:

```
$number -= $number % 6;
```