arrays with __get

gistfile1.php

<?php

class Object
{
        private $data = array();

        public function __set($property, $value)
        {
                $this->data[$property] = $value;
        }

        public function __get($property)
        {
                $result = $this->data[$property];

                return is_array($result) ? new ArrayObject($result) : $result;
        }
}

$obj = new Object();
$obj->data = array('one' => 'two');

echo $obj->data['one'];