Anyone ever used PHP's (unset) casting?

Question

I just noticed PHP has an type casting to (unset), and I\'m wondering what it could possibly be used for. It doesn\'t even really unset the variable, it just casts

Answer 1

For example it can be used like this

function fallback()
{
    // some stuff here
    return 'zoo';
}

var_dump(false ? 'foo' : fallback()); // zoo
var_dump(false ? 'foo' : (unset) fallback()); // null

Even if fallback() returns "zoo" (unset) will clear that value.