(PHP 5)
This class allows objects to work as arrays.
$input = []
   [, int $flags = 0
   [, string $iterator_class = "ArrayIterator"
  ]]] )ArrayObject::STD_PROP_LIST
      Properties of the object have their normal functionality when accessed as list (var_dump, foreach, etc.).
ArrayObject::ARRAY_AS_PROPS
      Entries can be accessed as properties (read and write).