PHP xor

Question

Expect:
True xor True = false
False xor false = false
True or false = true

The code attached shows differently on
true xor true = true

In addition, I thought echo false would print false or 0 instead of nothing.
https://code.sololearn.com/w44fOBaVt7DD/?ref=app

Answer 1

A cast to integer may be necessary to display false

(int)<expression>