anprguy
commented
3 months ago hi im struggling with this to mate
Ok so i worked it out. It appears to be a UUID (Universally Unique Identifier). UUIDs are standardized 128-bit identifiers used to uniquely identify information in computer systems. The format and structure of the ID in the database suggest it is a version 1 UUID.
Structure of a Version 1 UUID
A version 1 UUID is generated based on the current timestamp and the node ID (usually the MAC address). The structure of a version 1 UUID is as follows:
- **Timestamp**: The first 60 bits represent a timestamp.
- **Clock Sequence**: The next 14 bits are a clock sequence.
- **Node**: The last 48 bits are the node ID, which is typically the MAC address of the machine generating the UUID.Breakdown of the Provided UUID ( A sample from my test database)
Let's break down the UUID
289d3a20-3d6e-11ef-aca6-b3207c8f633c
:
- **Timestamp**:
289d3a20-3d6e-11ef
- The first three segments (
289d3a20-3d6e-11ef
) represent the timestamp.
- **Clock Sequence and Variant**:
aca6
- The next segment (
aca6
) represents the clock sequence and variant.
- **Node**:
b3207c8f633c
- The last segment (
b3207c8f633c
) represents the node ID, typically derived from the MAC address.
How It Was Created
A version 1 UUID is typically created using the following data:
1. **Current Timestamp**: The exact time when the UUID is generated.
2. **Clock Sequence**: A sequence number to help avoid duplicates that might occur when the clock is set backwards in time or if the node ID changes.
3. **Node ID**: Usually the MAC address of the machine generating the UUID.Example Code to Generate a Version 1 UUID
appears to be a UUID (Universally Unique Identifier). UUIDs are standardized 128-bit identifiers used to uniquely identify information in computer systems. The format and structure of the ID you provided suggest it is a version 1 UUID.
### Structure of a Version 1 UUID
A version 1 UUID is generated based on the current timestamp and the node ID (usually the MAC address). The structure of a version 1 UUID is as follows:
- **Timestamp**: The first 60 bits represent a timestamp.
- **Clock Sequence**: The next 14 bits are a clock sequence.
- **Node**: The last 48 bits are the node ID, which is typically the MAC address of the machine generating the UUID.Breakdown of the Provided UUID
Let's break down the UUID
179d3a20-3d6e-11ef-aca9-b3207c8f642c
:
- **Timestamp**:
179d3a20-3d6e-11ef
- The first three segments (
179d3a20-3d6e-11ef
) represent the timestamp.
- **Clock Sequence and Variant**:
aca9
- The next segment (
aca9
) represents the clock sequence and variant.
- **Node**:
b3207c8f642c
- The last segment (
b3207c8f642c
) represents the node ID, typically derived from the MAC address.How It Was Created
A version 1 UUID is typically created using the following data:
1. **Current Timestamp**: The exact time when the UUID is generated.
2. **Clock Sequence**: A sequence number to help avoid duplicates that might occur when the clock is set backwards in time or if the node ID changes.
3. **Node ID**: Usually the MAC address of the machine generating the UUID.
4. Example Code to Generate a Version 1 UUID
Using the
ramsey/uuid
library in PHP, you can generate a version 1 UUID as follows:
php
use Ramsey\Uuid\Uuid;
// Generate a version 1 (time-based) UUID
$uuid1 = Uuid::uuid1();
echo $uuid1->toString(); // Outputs a version 1 UUID
Can anyone advise how the user ID is generated in the users table?
Is it randomly generated or is it a hashed output from some user input whilst registering?
Any help in pointing me in the correct direction would be appreciated.