Base::load

static function load(): ?array
{
	if (self::$fields === null)
	{
		self::$fields = [];
	}
	$className = get_called_class();
	if (!array_key_exists($className, self::$fields))
	{
		self::$fields[$className] = self::loadInternal($className);
	}

	return self::$fields[$className];
}