Rounding up / down as an operation?

[tyteen4a03]

How do I round a price up/down to the nearest integer as an operation? round() seems to be a function but it's private so I can't use it in userland.

[frederikbosch]

You pass the rounding mode with operations like multiply and divide. Further, see.

$money->multiply(1.2, Money::ROUND_HALF_UP);