How to check the unique value generator for the probability of a collision?

Question

PHP

There are a dozen ways to generate a string, I understand that you can put a string to generate until there is a collision, but it can be tens of millions of records.

function randomString(int $length = 16): string {
        $string = '';
        while (($len = \strlen($string)) < $length) {
            $size   = $length - $len;
            $bytes  = \random_bytes($size);
            $string .= \substr(
                \str_replace(['/', '+', '='], '', \base64_encode(sprintf('%s%s', $bytes, time()))),
                0,
                $size
            );
        }

        return $string;
    }

        $isCollisioned = false;
        $generated     = [];
        while (false === $isCollisioned) {
            $str = randomString(64);
            if (true === in_array($str, $generated, true)) {
                var_dump(count($generated));
            }
            $generated[] = $str;
        }

Maybe there are online services where you can run scripts? And then the machine can hang while the script is running.

Answer 1

Just take a virtual one anywhere and run it. What is the problem? You can also take more powerfully so that it is processed faster. You can run in multiple threads with different ranges