How to generate a unique ID with php

This article mainly explains "how to generate unique ID with php", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let Xiaobian take you to learn "how to use php to generate unique ID"!

Php generates unique IDs in common scenarios, such as temporary cache file names, temporary variables, temporary security codes, etc. The uniqid() function generates a unique ID based on the current time in microseconds. Since the generation of unique IDs is associated with microsecond time, the uniqueness of IDs is very reliable.

The generated unique ID defaults to a string length of 13 strings. If combined with the md5() function, the generated unique ID will have higher reliability. The biggest advantage of this generated ID over random ID is that it can be sorted, especially for some values that need to be stored in the database. Of course, random numbers can also be added to this one.

Personally, I think it is better to manually handle the generation of unique id comparison points, as far as possible to reduce the repetition probability of generating id. Here are four ways to generate unique IDs for your reference.

1、md5(time() . mt_rand(1,1000000));

There's a certain probability that this method will repeat itself.

php built-in function uniqid()

The uniqid() function generates a unique ID based on the current time in microseconds.

The w3school reference manual has a sentence:"The ID generated by this function is not optimal because it is based on system time. To generate an absolutely unique ID, use the md5() function.

3, combined with md5() function to generate a unique ID

4. Manually handle the cases given by the authorities.

At this point, I believe that everyone has a deeper understanding of "how to use php to generate unique IDs", so you may wish to actually operate it! Here is the website, more related content can enter the relevant channels for inquiry, pay attention to us, continue to learn!