Description:
------------
I don't know the exact name for this. But being able to reference an index from a function that returns an array would be very usefull.

Reproduce code:
---------------
function returnarray() {
   return array('abc' => 'blah blah', '123' => 'blee blee');
}
echo returnarray()['abc'];
echo returnarray()['123'];

Expected result:
----------------
blah blah
blee blee

Actual result:
--------------
Parse Error as it's obviously not implemented...