How to Generate UUID in PHP
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Create a Function to Generate V3
UUIDin PHP -
Create a Function to Generate V4
UUIDin PHP -
Create a Function to Generate V5
UUIDin PHP
Generating a universally unique id UUID can be tricky in PHP as the built-in function uniqid() doesn’t guarantee the uniqueness of the output id.
We can create functions to generate different versions of UUID in PHP, including v3, v4, and v5. This tutorial demonstrates how to generate UUID in PHP.
Create a Function to Generate V3 UUID in PHP
The V3 UUID is a unique ID generated from an MD5 hashing of a namespace and given string. The function below is an example of generating V3 UUID in PHP.
<?php
function v3_UUID($name_space, $string) {
$n_hex = str_replace(array('-','{','}'), '', $name_space); // Getting hexadecimal components of namespace
$binary_str = ''; // Binary Value
//Namespace UUID to bits conversion
for($i = 0; $i < strlen($n_hex); $i+=2) {
$binary_str .= chr(hexdec($n_hex[$i].$n_hex[$i+1]));
}
//hash value
$hashing = md5($binary_str . $string);
return sprintf('%08s-%04s-%04x-%04x-%12s',
// 32 bits for the time low
substr($hashing, 0, 8),
// 16 bits for the time mid
substr($hashing, 8, 4),
// 16 bits for the time hi,
(hexdec(substr($hashing, 12, 4)) & 0x0fff) | 0x3000,
// 8 bits and 16 bits for the clk_seq_hi_res,
// 8 bits for the clk_seq_low,
(hexdec(substr($hashing, 16, 4)) & 0x3fff) | 0x8000,
// 48 bits for the node
substr($hashing, 20, 12)
);
}
$v3_uuid = v3_UUID('5f6384bfec4ca0b2d4114a13aa2a5435', 'delftstack!');
echo $v3_uuid;
$v3_uuid = v3_UUID('591531f16f581b69a390980eb282ba83', 'this is delftstack!');
echo "<br>";
echo $v3_uuid;
?>
The code above generates version 3 universally unique id from given namespace md5 hash and the string.
Output:
18e24dee-96e1-3dbd-9c3c-e684c1a10fd5
3bf89731-20f0-3d78-b06a-3f70c6fff898
Create a Function to Generate V4 UUID in PHP
Version 4 UUID generates a Unique ID based on random number generation.
<?php
function v4_UUID() {
return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
// 32 bits for the time_low
mt_rand(0, 0xffff), mt_rand(0, 0xffff),
// 16 bits for the time_mid
mt_rand(0, 0xffff),
// 16 bits for the time_hi,
mt_rand(0, 0x0fff) | 0x4000,
// 8 bits and 16 bits for the clk_seq_hi_res,
// 8 bits for the clk_seq_low,
mt_rand(0, 0x3fff) | 0x8000,
// 48 bits for the node
mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
);
}
for ($x = 0; $x <= 10; $x++) {
$v4_uuid = v4_UUID();
echo $v4_uuid;
echo "<br>";
}
?>
The version 4 UUID function generates a new unique id. The code above tries to run the function ten times.
Output:
20a9d4e8-63a8-48f0-910f-c7339d8fd7ec
499a9d4a-fbf1-4ea7-850b-01bf301a98af
8fa903bc-0789-43b2-901b-70d6c60334ba
eb036f8a-75bd-4811-a477-1444e2521f3b
25c00e25-9042-4f04-b059-c34820b800f8
7f65c049-1feb-4d41-98ee-35156e81221f
abfd9937-a08b-47b0-8b64-3338455d99f4
43a9245a-275a-4b23-8ac0-a63fefa13013
bbfc7b5b-f77f-4a58-a3ce-5163bac61a4c
f660bbbf-dd1a-4eab-9866-dba8092c94c5
b7f6046a-b834-48f0-856e-8a360b495406
Create a Function to Generate V5 UUID in PHP
The V5 UUID is a unique ID generated from an SHA-1 hashing a namespace and given string.
<?php
function v5_UUID($name_space, $string) {
$n_hex = str_replace(array('-','{','}'), '', $name_space); // Getting hexadecimal components of namespace
$binray_str = ''; // Binary value string
//Namespace UUID to bits conversion
for($i = 0; $i < strlen($n_hex); $i+=2) {
$binray_str .= chr(hexdec($n_hex[$i].$n_hex[$i+1]));
}
//hash value
$hashing = sha1($binray_str . $string);
return sprintf('%08s-%04s-%04x-%04x-%12s',
// 32 bits for the time_low
substr($hashing, 0, 8),
// 16 bits for the time_mid
substr($hashing, 8, 4),
// 16 bits for the time_hi,
(hexdec(substr($hashing, 12, 4)) & 0x0fff) | 0x5000,
// 8 bits and 16 bits for the clk_seq_hi_res,
// 8 bits for the clk_seq_low,
(hexdec(substr($hashing, 16, 4)) & 0x3fff) | 0x8000,
// 48 bits for the node
substr($hashing, 20, 12)
);
}
$v5_uuid = v5_UUID('8fc990b07418d5826d98de952cfb268dee4a23a3', 'delftstack!');
echo $v5_uuid;
$v5_uuid = v5_UUID('24316ec81e3bea40286b986249a41e29924d35bf', 'this is delftstack!');
echo "<br>";
echo $v5_uuid;
?>
The code above generates version 5 universally unique id from the given namespace SHA-1 hash and the string.
Output:
3b0018c3-f273-5889-88e7-8c66a8720e99
7e506c50-b7fc-5180-9f9f-2bf28fdd946d
Furthur more to generate UUIDs, there are a few libraries provided out there like Ramsey/uuid and Lootils/uuid, which can be used on convenience.
Sheeraz is a Doctorate fellow in Computer Science at Northwestern Polytechnical University, Xian, China. He has 7 years of Software Development experience in AI, Web, Database, and Desktop technologies. He writes tutorials in Java, PHP, Python, GoLang, R, etc., to help beginners learn the field of Computer Science.
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