Description:
------------
This is a continuation of #42622 - I'm sorry I had to open a new bug report, but the old one was marked as bogus and could not comment on it.

Reproduce code:
---------------
class Foo
{
  function example( $name )
  {
    $bar = $this->getBar();
    echo $bar->$name;
  }
}

Expected result:
----------------
Should work for both example('abc') and example('a["b"]')

Actual result:
--------------
Doesn't work for example('a["b"]')