Description:
------------
The code from the description now has a different output. I'm not sure if it's intentional, so I decided to post it as a bug. It's definitely a BC change.

Also see:

http://3v4l.org/pE0UN



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

$foo = [
   'a' => 'b'    
];

$bar = [
   'b' => 'c'  
];

$bar = (object)$bar;

// Note that the following line is interpreted as
// $bar->b in PHP < 7, and $bar->Array in PHP > 7.
echo $bar->$foo['a'];

Expected result:
----------------
c


Actual result:
--------------
Notice: Array to string conversion in /in/pE0UN on line 14 Notice: Undefined property: stdClass::$Array in /in/pE0UN on line 14