in reply to Re^2: Boolean counter?
in thread Boolean counter?
The difference is that $toggle ^= 1; leaves you with a number (0 or 1) while $toggle = !$toggle; leaves you with a boolean.
Honestly, it sounds like the OP wants a boolean, so the easier to read negation should be used. If he wants to display the boolean, that's an outputting formatting issue to be resolved then.