I have a doubt php of a chagenger

Question

why this code outputs 13 and not 12?
https://code.sololearn.com/wY7Jx06hhkG1/?ref=app
I am new. Thank for your support!

Answer 1

++$x is called pre-increment operator. This means that first, 1 is added to x, and the result is then evaluated in the expression. On the right side x is incremented twice this way so it becomes (6+7)

Answer 2

I see, thank!!!