First of all, it's not a good idea to put authentication information (e.g. usernames and passwords) in URLs (users would reveal their passwords simply by copy/pasting links, etc.).
That said, if you want to obscure the order that URLs were added to the shortening service, you could use the output of a cryptographic hash function such as MD5 or SHA1 (which is considered "irreversible", i.e. infeasible to derive the input from the output), base-64 encode that, and take eight characters, for example. The input to the hash function could be the URL (possibly the current time as well).
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随机生成一个id，检查是否已经被使用过？
Generate an id at random and check to see if it has been used already?
也许你可以使用 SHA 来散列它
编辑：更好地生成一个随机数并对其进行散列，正如 Jon 指出的那样
May be you can use a SHA to hash it
EDIT: Better generate a random number and hash it as Jon pointed out
首先，将身份验证信息（例如用户名和密码）放入 URL 中并不是一个好主意（用户只需通过复制/粘贴链接等即可泄露其密码。 ）。
也就是说，如果您想隐藏 URL 添加到缩短服务的顺序，您可以使用 MD5 或 SHA1 等加密哈希函数的输出（这被认为是“不可逆的”，即例如，无法从输出推导输入），采用 base-64 编码，并采用八个字符。哈希函数的输入可以是 URL（也可能是当前时间）。
First of all, it's not a good idea to put authentication information (e.g. usernames and passwords) in URLs (users would reveal their passwords simply by copy/pasting links, etc.).
That said, if you want to obscure the order that URLs were added to the shortening service, you could use the output of a cryptographic hash function such as MD5 or SHA1 (which is considered "irreversible", i.e. infeasible to derive the input from the output), base-64 encode that, and take eight characters, for example. The input to the hash function could be the URL (possibly the current time as well).