Description:
------------
When using a switch statement inside a foreach loop array elements that have a value of 0 are compared in case statements incorrectly. 

Test script:
---------------
$a = [0,0,0,0,0];
foreach ($a as $i) {
    switch ($i) {
        case $i > 0:
        echo 'true';
    }
}

Expected result:
----------------
We should expect no output since 0 is not greater than 0 and therefore doesn't satisfy the case. This has been tested on both 7.2 and 7.1.

Actual result:
--------------
truetruetruetruetrue