Demonstrating why RecursiveArrayIterator is useless whent he items are objects.

gistfile1.php

<?php

$multi_array = array(
    'foo' => array( 
        'bar' => (object) array( 'baz' => 'bat' ),
    ),
);

var_dump( iterator_to_array( new RecursiveIteratorIterator( new RecursiveArrayIterator( $multi_array ) ) ) );

class RecursiveRealArrayIterator extends RecursiveArrayIterator 
{
    public function hasChildren() 
    {
        $current = $this->current();
        return is_array( $current ) || $current instanceof Traversable;
    }
}

var_dump( iterator_to_array( new RecursiveIteratorIterator( new RecursiveRealArrayIterator( $multi_array ) ) ) );