Description:
------------
Why does operator [] create a new array when applied on boolean FALSE and doesn't do so  when applied on integer 0? One of that is IMHO wrong. Either this operator should create a new array on everything that is empty() or it should fail on all scalar types and make a new array only from empty string "" or NULL or uninitialized variable.


Reproduce code:
---------------
$a = 0;
$a[10] = 1;
var_dump($a);

$b = false;
$b[10] = 1;
var_dump($b);


Expected result:
----------------
Warning:  Cannot use a scalar value as an array ...
Warning:  Cannot use a scalar value as an array ...


Actual result:
--------------
array(1) {
  [10]=>
  int(1)
}

Warning:  Cannot use a scalar value as an array ...