What is happening with this?

Question

What is happening with this?

He tells me complete the spaces in blank spaces to print from 1 to 15 on the screen.

but if I put
// while ($ i <= 15) {
// echo $ i;
// $ i ++;
//

what it prints will be up to 14 not until 15, because 15 is when it is conditioned false, the correct answer should be 16.

Answer 1

It will be 15 because you check for less or equal 15 and increment after print.

Answer 2

Increment before printing, then it will work