PHP Recursion Fun

gistfile1.php

<?php

$a = array(
  'foo' => array(
    'bar' => array(
      'baz' => 'foo',
      'bar' => array(
        'loo' => 'poo'
      ),
    ),
  ),
);

function _r(&$a, $key, $value) {
  foreach ($a as $k => &$v) {
    if ($k == $key && $value == $v) {
      return $a;
    }
    if (is_array($v)) {
      return _r($v, $key, $value);
    }
  }
  return NULL;
}

$r = _r($a, 'loo', 'poo');

var_dump($r);
$r['loo'] = 'goo';
print_r($a);