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Example code of rafalswierczek/uuid4

Informations about the package uuid4

Super simple UUID v4 generator in PHP

Installation:

composer require rafalswierczek/uuid4

Usage:

Explanation:

UUID v4 is data of 128 random bits (with small modifications) represented in hexadecimal notation.

Data is divided into 16 octets (from 0 to 15), 8 bits each.

Octets are grouped into sections with following names:

Result of UUID4 in hex notation looks like this:

f2e0aa63-22f2-410c-bcfa-9475cf573193

As you can see, for example time_low has 4 octets, each is as follows f2, e0, aa, 63 in hex notation.

Now once you have 128 random bits, you have to modify octet 8 in the way that two most significant bits (MSB) are set to: 0 and 1. For example, let's say 8 octet is as follows: 01101101. Now you have to make sure that two bits on the left are 00 and then you can add desired 10 so the result is: 10101101. It's done this way:

01101101 & 00111111 = 00101101

00101101 | 10000000 = 10101101

Once clock_seq_and_reserved is updated it's time to modify octet 6 (first 8 bits of time_high_and_version). You have to do the same steps but with 00001111 for AND and 01000000 for OR. For example if octet 6 is 10100101, the result is 01000101 so first 4 bits are replaced with 0100 which are bits reserved for UUID v4.

After modifying octet 8 and 6 of 128 random bits and converting it to hex notation you have ready to use UUID v4 string :)

RFC: https://datatracker.ietf.org/doc/html/rfc4122#section-4.4

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