Description:
------------
There is a bug in PHP where the below code returns an unexpected value.
It looks like making references to an array or elements has side-effects to the original array.

This is an issue that has been reported many times around 20 years ago, but reported as "won't fix" (I believe due to performance issues).
- https://bugs.php.net/bug.php?id=20993
- https://bugs.php.net/bug.php?id=6417
- https://bugs.php.net/bug.php?id=7412
- https://bugs.php.net/bug.php?id=15025

I'm unsure if this issue has been raised recently, but would like to see if this major bug will finally be fixed.

Also, can we at least have this documented in the official PHP docs. 
Currently I can only find this mentioned in comments:

- https://www.php.net/manual/en/language.references.php#79220
- https://www.php.net/manual/en/language.references.whatdo.php#102123
- https://www.php.net/manual/en/language.references.php#79220




Test script:
---------------
$a = [['name' => 'John']];
$unusedVariable = &$a[0]; // seems to modify $a[0], so its type &array
$b = $a;
$b[0]['name'] = "Bob";
echo $a[0]['name];

Expected result:
----------------
John

Actual result:
--------------
Bob