Lithium Docs

						protected function _message(&$data = array(), $message =  null) {
		if (!empty($data[0])) {
			foreach ($data as $key => $value) {
				$message = (!empty($data[$key][0])) ? $message : null;
				$message .= $this->_message($value, $message);
				unset($data[$key]);
			}
			return $message;
		}
		$defaults = array('trace' => null, 'expected' => null, 'result' => null);
		$result = (array) $data + $defaults;

		$message = null;
		if (!empty($result['trace'])) {
			$message = sprintf("trace: %s\n", $result['trace']);
		}
		if (is_object($result['expected'])) {
			$result['expected'] = get_object_vars($result['expected']);
		}
		if (is_object($result['result'])) {
			$result['result'] = get_object_vars($result['result']);
		}
		return $message . sprintf("expected: %s\nresult: %s\n",
			var_export($result['expected'], true),
			var_export($result['result'], true)
		);
	}