Recursive check php

rec_check.php

private function recursiveCheck($array)
{
    $iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($array),
                         RecursiveIteratorIterator::SELF_FIRST);
    foreach ($iterator as $key => $current) {
        $keyValid = array('section', 'block', 'text', 'item');
        if(in_array($key, $keyValid) && $key !== 0 && $this->is_assoc($current)){
          //error_log('key: '.$key);
          $prevValue = $iterator->getInnerIterator()->offsetGet( $key );
          $iterator->getInnerIterator()->offsetUnset($key);
          $iterator->getInnerIterator()->offsetSet( $key, (object) Array($prevValue));
        }

    }
}