why we are using uniqid

Question

why we are using uniqid

Answer 1

Do you mean, what is the purpose of this function?
Here are explanations and examples:
https://www.w3schools.com/PHP/func_misc_uniqid.asp
http://php.net/manual/en/function.uniqid.php

Answer 2

I'm not understanding your question here, where is this uniqid is used in PHP, can you elaborate some more?