PHP: Format file size units

formatFileSize.php

public static function formatFileSize($fileSize) {
	if ($fileSize >= 1073741824) {
		$fileSize = round($fileSize / 1073741824 * 100) / 100 . " " . self::_translate()->_('ГБ');
	} elseif ($fileSize >= 1048576) {
		$fileSize = round($fileSize / 1048576 * 100) / 100 . " " . self::_translate()->_('МБ');
	} elseif ($fileSize >= 1024) {
		$fileSize = round($fileSize / 1024 * 100) / 100 . " " . self::_translate()->_('КБ');
	} else {
		$fileSize = $fileSize . " " . self::_translate()->_('Б');
	}
	return $fileSize;
}