<?php
$data = array(
    'foo' => array(
        'bar' => (object) array (
            'baz' => 1
        )
    )
);
$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($data));

foreach($iterator as $key=>$value) {
    echo $key.' -- '.$value.'<br />';
}

baz -- 1<br />