Description:
------------
https://3v4l.org/SlLdF#v702

http://php.net/manual/en/arrayiterator.construct.php mentions two parameters: array and flags.

In 7.0.1 it has only array, since 7.0.2 it has array, ar_flags and iterator_class. Behaviour changed by https://bugs.php.net/bug.php?id=71077

For ArrayObject is also reports ar_flags instead of flags.

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

$rm = new ReflectionMethod('ArrayIterator', '__construct');

var_dump($rm->getParameters());

Expected result:
----------------
array(1) {
  [0]=>
  object(ReflectionParameter)#2 (1) {
    ["name"]=>
    string(5) "array"
  }
}

or 

array(3) {
  [0]=>
  object(ReflectionParameter)#2 (1) {
    ["name"]=>
    string(5) "array"
  }
  [1]=>
  object(ReflectionParameter)#3 (1) {
    ["name"]=>
    string(8) "flags"
  }
}

Actual result:
--------------
array(3) {
  [0]=>
  object(ReflectionParameter)#2 (1) {
    ["name"]=>
    string(5) "array"
  }
  [1]=>
  object(ReflectionParameter)#3 (1) {
    ["name"]=>
    string(8) "ar_flags"
  }
  [2]=>
  object(ReflectionParameter)#4 (1) {
    ["name"]=>
    string(14) "iterator_class"
  }
}