Description:
------------
When passing an array by value to a function, which immediately returns that array, and then using that return value in a foreach with a reference, it allows modifying the original array as if it was passed by reference.

These variants work properly:

............. Variant 1
[same main body]

function z($t)
{
// Force copy-on-write
    $t[0] .= 'x';
    return $t;
}
.............


............. Variant 2
    $a = [ 'a', 'b', 'c' ];
    $b = z($a);
// Assigning to variable causes proper copy-on-write behavior
    foreach($b as &$x) {
        $x .= 'q';
    }
    print_r($a);

[same z function]
.............

Test script:
---------------
<?php
    $a = [ 'a', 'b', 'c' ];
    foreach(z($a) as &$x) {
        $x .= 'q';
    }
    print_r($a);

function z($t)
{
    return $t;
}


Expected result:
----------------
Array
(
    [0] => a
    [1] => b
    [2] => c
)


Actual result:
--------------
Array
(
    [0] => aq
    [1] => bq
    [2] => cq
)