[Solved] How can I toggle a boolean number?

Question

Your approach is correct and will work as well. Just you need to wrap it into a function. Another way is using ^ (Bitwise XOR) to do that functional and more clean:

function toggleNumber( $num ) {
    return $num ^= 1;
}

Online Demo

That function gets the number and does XOR with 1 on it. Then the number will be toggled.

Accepted Answer

Your approach is correct and will work as well. Just you need to wrap it into a function. Another way is using ^ (Bitwise XOR) to do that functional and more clean:

function toggleNumber( $num ) {
    return $num ^= 1;
}

Online Demo

That function gets the number and does XOR with 1 on it. Then the number will be toggled.