仅由数字组成的唯一 ID [英] Unique id consisting of only numbers

问题描述

我需要获得基于时间的唯一 id，它只包含数字，我想简单地使用这样的东西:

I need to get time based unique id which would only consist of numbers, i was thinking to simply use something like this:

str_replace(".", "", microtime(true))

我会在很多事情上使用这个 id，例如发表评论，我预计会有相当高的流量，所以我想知道与 microtime 函数发生冲突的几率有多大?

I would use this id for many things, for example comments posting, and i'm expecting quite high traffic so i would like to know how high are the chances of collision with microtime function?

也许有更好的方法来获取数字唯一 ID?请记住，它必须基于时间，以便进行排序.

And perhaps there is a better way to get numerical unique id? Just remember that it has to based on time so sorting could be done.

推荐答案

如果您需要使用纯基于时间的 ID，您需要确保避免冲突，因此 a) 使用数据库中的主键，然后 b) 使用递归检查以确保您的基于时间的 ID 尚未被占用:

If you need to use a pure time based ID you need to ensure that you avoid collisions so a) use a primary key in the database and then b) use a recursive check to ensure that your time based ID has not already been taken:

$id = getTimeId();

function getTimeId() {
    // Generate microtime
    // Query to ensure it does not exist
    // Return microtime
}

我将把它留给你好先生来享受递归.

I shall leave it upto you good sir to enjoy making it recursive.

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