gistfile1.txt

private function _diff($old, $new)
{
	$diffs = array();

	foreach ($old as $section => $v)
	{
		if (is_array($v))
		{
			$array_diffs = $this->_diff($v, $new[$section]);

			if (!empty($array_diffs))
				$diffs[$section] = (isset($array_diffs[0]) ? $array_diffs[0] : $array_diffs);
		}
		else
		{
			// sabre often doesn't have certain, specific pieces of data that we do have,
			// and we don't want to blank out our data, so skip any blanks
			if ($new[$section] != $v && !empty($new[$section]))
			{
				$diffs[$section]['old'] = $v;
				$diffs[$section]['new'] = $new[$section];
			}
		}
	}

	return $diffs;
}