Description:
------------
Traversing the array changes once the internal pointer by 1.
Traversing the array by link changes the internal pointer just as with each().

Test script:
---------------
<?php
$array = [0, 1, 2];
while (each($array)) {
    var_dump(key($array));
}

reset($array);
echo "----\n";

foreach ($array as $elem) {
    var_dump(key($array));
}

reset($array);
echo "----\n";

$array2 = &$array;
foreach ($array2 as $elem) {
    var_dump(key($array));
}

Expected result:
----------------
int(1)
int(2)
NULL
----
int(1)
int(2)
NULL
----
int(1)
int(2)
NULL

Actual result:
--------------
int(1)
int(2)
NULL
----
int(1)
int(1)
int(1)
----
int(1)
int(2)
NULL