Description:
------------
http://3v4l.org/3NKUS  

The problem is illustrated here. It is causing a number of my tests to fail in 7 using build 20150201.

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

class Foo {
    function bar(){
        echo "Futbal";
    }
}

$baz = new Foo;
$qux = array("quux" => "bar");
$baz->$qux["quux"]();

Expected result:
----------------
"Futbal"

Actual result:
--------------
Notice: Array to string conversion in /in/3NKUS on line 13

Notice: Undefined property: Foo::$Array in /in/3NKUS on line 13

Fatal error: Function name must be a string in /in/3NKUS on line 13

Process exited with code 255.