UserFieldTable::serializeMultipleDatetime

static function serializeMultipleDatetime($value)
{
	if (is_array($value) || $value instanceof Traversable)
	{
		$tmpValue = array();

		foreach ($value as $k => $singleValue)
		{
			/** @var TypeDateTime $singleValue */
			$tmpValue[$k] = $singleValue->format(static::MULTIPLE_DATETIME_FORMAT);
		}

		return serialize($tmpValue);
	}

	return $value;
}