When should I use a bitwise operator?

Question

I read the following Stack Overflow questions, and I understand the differences between bitwise and logical.

• Difference between & and && in

Answer 1

Well, asuming there is $x = (false && some_function());, here the value of $x will be set without calling the some_function() because the first value was FALSE.

But what if you needed to call that function anyway? Use $x = (false & some_function());.

In other words, the & uses MORE processing than the &&, just because && does not run through all the values to check them. If it found one value as false, it would return it, not looking at other values.

And in logical operations, use the && operator as it's used to return the logical operation value, where & is used to set a value and in an if statement it will always return true.