Description:
------------
Hello, this is a pretty basic issue, basically, it seems that when using an array with a mix of strings and integers or default keys (0, 1, 2 etc), if using foreach to iterate through each element of the array intending for something specific to happen when the string key is hit, and having a 0 element in the array, the 0 element is running what should only be happening when that string element is in the array.  I do not believe this issue had occurred in previous versions of php but I had just recently updated to 5.6.24 from 5.6.21.

Thank you,

Test script:
---------------
<?php

        // Test for switch not running default code when array element key is 0 if there is a mix of array keys that are numerical along with a string array key

        $test = array(0 => "First element, should be 0",1 => "Second element, should be 1",2 => "Third element, should be 2","Three" => "Fourth element, should be Three");

        print_r($test);

        foreach($test as $k => $v) {
                switch($k) {
                        case "Three":
                                echo "not to be printed\n";
                        break;
                        default:
                                echo $k.": ".$v."\n";
                        break;
                }
        }

?>

Expected result:
----------------
Array
(
    [0] => First element, should be 0
    [1] => Second element, should be 1
    [2] => Third element, should be 2
    [Three] => Fourth element, should be Three
)
0: First element, should be 0
1: Second element, should be 1
2: Third element, should be 2
not to be printed

Actual result:
--------------
Array
(
    [0] => First element, should be 0
    [1] => Second element, should be 1
    [2] => Third element, should be 2
    [Three] => Fourth element, should be Three
)
not to be printed
1: Second element, should be 1
2: Third element, should be 2
not to be printed