Online PHP editor | output for RBLqY

<?php $myArray = array( 0 => "a", 1 => array( 0 => "a", 1 =>"b", 2 => array( 0 =>"a", 1 =>"b", 2 =>"c", 3 => new ArrayObject( 0 => "a", 1 => "b", 3 => "c", 4 => "d", 5 => array("the end") ) ) ) ); $recursive_array_iterator = new RecursiveArrayIterator(new ArrayObject($myArray)); iterator_apply($recursive_array_iterator, 'traverseRecursiveArray', array($recursive_array_iterator)); var_dump($recursive_array_iterator); function traverseRecursiveArray($iterator) { $i = 0; while ($iterator->valid()) { if ($iterator->hasChildren()) { traverseRecursiveArray($iterator->getChildren()); } else { $iterator->offsetSet($iterator->key(), manipulate($iterator->current())); echo $iterator->key() . ' => ' . $iterator->current() . PHP_EOL; } $iterator->next(); } } function manipulate($string) { $string .= " appended"; return $string; } var_dump($myArray);