uniqueidentifier – Page 5

How to generate a random, unique, alphanumeric string?

September 15, 2022 by Tarik

PHP 7 standard library provides the random_bytes($length) function that generate cryptographically secure pseudo-random bytes. Example: $bytes = random_bytes(20); var_dump(bin2hex($bytes)); The above example will output something similar to: string(40) “5fe69c95ed70a9869d9f9af7d8400a6673bb9ce9” More info: http://php.net/manual/en/function.random-bytes.php PHP 5 (outdated) I was just looking into how to solve this same problem, but I also want my function to create a … Read more

How unique is UUID?

September 10, 2022 by Tarik

Very safe: the annual risk of a given person being hit by a meteorite is estimated to be one chance in 17 billion, which means the probability is about 0.00000000006 (6 × 10−11), equivalent to the odds of creating a few tens of trillions of UUIDs in a year and having one duplicate. In other … Read more

How to create a GUID/UUID in Python

September 5, 2022 by Tarik

The uuid module provides immutable UUID objects (the UUID class) and the functions uuid1(), uuid3(), uuid4(), uuid5() for generating version 1, 3, 4, and 5 UUIDs as specified in RFC 4122. If all you want is a unique ID, you should probably call uuid1() or uuid4(). Note that uuid1() may compromise privacy since it creates … Read more

Is there a unique Android device ID?

August 23, 2022 by Tarik

Settings.Secure#ANDROID_ID returns the Android ID as an unique for each user 64-bit hex string. import android.provider.Settings.Secure; private String android_id = Secure.getString(getContext().getContentResolver(), Secure.ANDROID_ID); Also read Best practices for unique identifiers: https://developer.android.com/training/articles/user-data-ids