Description:
------------
PHP parser doesn't allow for array index operation to be used on a 
result of a function call.  I propose a patch to allow such a 
construction.

Reproduce code:
---------------
<?php
  function car_brands() {
    return array("chevy", "hummer");
  }
  print car_brands()[1] . "\n";
?>


Expected result:
----------------
"hummer"



Actual result:
--------------
Parse error: syntax error, unexpected '[' in test.php on line 5