protected static function readSaltFromFile(): string
    {
        Utility::validatePath(static::$saltFile);
        $result = file_get_contents(static::$saltFile);
        $result = $result ?: '';
        static::validateSalt($result);

        return $result;
    }
protected static function readSaltFromFile(): string
    {
        Utility::validatePath(static::$saltFile);
        $result = file_get_contents(static::$saltFile);
        $result = $result ?: '';
        static::validateSalt($result);

        return $result;
    }
protected static function readSaltFromFile ( ) : string { Utility :: validatePath ( static :: $ saltFile ) ; $ result = file_get_contents ( static :: $ saltFile ) ; $ result = $ result ? : '' ; static :: validateSalt ( $ result ) ; return $ result ; }
Read salt string from file

@return string Valid salt string
Read salt string from file