Description:
------------
Whenever testing for a variable with the value false using is_bool inside a switch statement will return false instead of true.

I have tested it with different php versions, it happened on all of them.


Test script:
---------------
echo phpversion();
$var = false;
switch ($var) {
    case is_bool($var):
        echo "boolean";
        break;
    case is_numeric($var):
        echo "number";
        break;
}
if (is_bool($var))
    echo "boolean";
elseif (is_numeric($var))
    echo "number";

Expected result:
----------------
5.3.4booleanboolean

Actual result:
--------------
5.3.4numberboolean