How to shorten something like this?

Question

PHP

Hello. There is a delusional condition

if ($i == 3 OR $i == 6 OR $i == 9 OR $i == 12 OR $i == 15 OR $i == 18 OR $i == 21 OR $i == 24 OR $i == 27 OR $i == 30) {
//
}

how can this be shortened? I know that I need the remainder of the division, but I can’t figure out how to set it correctly. Weak in math.

Answer 1

I decided $i % 3 == 0 myself.