Recursively search the haystack for a specific key and return it's path

/**
 * Recursively search the haystack for a specific key and return:
 * 1) an array containing the keys that correspond to the path of
 *    the first found instance path AND
 * 2) the value itself.
 *
 * @param $needle
 *   The searched value.
 * @param array $haystack
 *   The array.
 * @param array $stack
 *   The stack
 *
 * @return array|bool
 *   The array containing the searched key path and value|False if not found.
 */
function array_key_search_recursive($needle, array $haystack, $stack = array()) {
  if (array_key_exists($needle, $haystack)) {
    array_push($stack, $needle);
    return array(
      'path' => $stack,
      'value' => $haystack[$needle],
    );
  }
  foreach ($haystack as $k => $v) {
    if (is_array($v)) {
      array_push($stack, $k);
      $found = call_user_func(__FUNCTION__, $needle, $v, $stack);
      if ($found) {
        return $found;
      }
      array_pop($stack);
    }
  }
  return FALSE;
}