Description:
------------
In PHP 5 it was possible to invoke get_object_vars() with call_user_func() in order to get only public variables. This is no longer the case.

 1) I can't find any documentation about this change on the pages for get_object_vars, call_user_func OR the migration for 7.0 (grepping for 'scope')

 2) This upvoted comment introduced the hack with call_user_func() to me: http://php.net/manual/en/function.get-object-vars.php#113435


I suggest two things

 A) Add an editor note on the comment mentioned in 2). Tell that this only works in PHP 5

 B) Add more info in http://php.net/manual/en/migration71.incompatible.php or http://php.net/manual/en/migration71.changed-functions.php

  - I presume this is not a change in call_user_func() or get_object_vars() themselves. I was not able to find what the source of this change actually is, hence more info of *some kind* is requested.


Test script:
---------------
class M
  {
    protected $A = 'foo';

    private $B = 'bar';

    public Function dump ()
      {
        var_dump (
            array_keys (get_object_vars ($this)),
            array_keys (call_user_func ('get_object_vars', $this))
          );

        return $this;
      }

  }

 var_dump (get_object_vars ((new M)->dump ()));

Expected result:
----------------
https://3v4l.org/94ES3

 - The result between PHP 5 and PHP 7 differs