Description:
------------
The Variable variables in PHP don't work properly with multi-arrays.
You should be able to display the value from an array key by joining the multi-array variable and the keys.

Reproduce code:
---------------
$results['rss']['channel']['item'][0]['title'] = "Hello there";

$a = "results";
$b = "['rss']['channel']['item'][0]['title']";

echo ${$a.$b};

Expected result:
----------------
I expect it to display "Hello there";

Actual result:
--------------
Undefined variable: results['rss']['channel']['item'][0]['title']