Config::getAliasEncoding

static function getAliasEncoding(string $encoding): ?string 
{
	static $aliasEncoding = [
		'windows-1250' => 'iso-8859-2',
		'windows-1252' => 'iso-8859-1',
	];
	if (isset($aliasEncoding[$encoding]))
	{
		return $aliasEncoding[$encoding];
	}

	$alias = array_search($encoding, $aliasEncoding);
	if ($alias !== false)
	{
		return $alias;
	}

	return null;
}