dotku

<?php 
$arr1 = array(
            'level1' => array(
                'level2' => array(
                    'level3' => 'hello'
                )
            )
        );
        $arr2 = array('level3'=>'world');
        $needle1 = array('level3'=>'hello');

jonataswalker

<?php
**
 * Public Domain.
 * @author Jonatas Walker
 * Based in: http://kvz.io/blog/2007/10/03/convert-anything-to-tree-structures-in-php/
 * Usage:
 * $root = '/home/www/';
 * $allow_ext = array('jpg','gif');
 * $exclude_dir = array('tilemill');
 * $prefix = 'small';