PHP/MySQL - Best way to create unique random string?

Question

How do I create a random unique string in MySQL?

when I need to create a random string in PHP I use this function:

public function generateString($le         


        

Answer 1

If you want to use these strings for security purpose, you should use openssl_random_pseudo_bytes which will indicate you if PHP was able to use a strong algorithm to generate it:

Ouput needs some cleaning though. Have a look at this question for more info.