Cách tạo mã UUID v4 bằng PHP

Vô cùng đơn giản nếu sử dụng 1 function sau

Code:

<?php 

if ( ! function_exists('generate_uuid_v4'))

{

function generate_uuid_v4()

    {

        return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',

        // 32 bits for "time_low"

        mt_rand(0, 0xffff), mt_rand(0, 0xffff),

        // 16 bits for "time_mid"

        mt_rand(0, 0xffff),

        // 16 bits for "time_hi_and_version",

        // four most significant bits holds version number 4

        mt_rand(0, 0x0fff) | 0x4000,

        // 16 bits, 8 bits for "clk_seq_hi_res",

        // 8 bits for "clk_seq_low",

        // two most significant bits holds zero and one for variant DCE1.1

        mt_rand(0, 0x3fff) | 0x8000,

        // 48 bits for "node"

        mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)

        );

    }

}

echo generate_uuid_v4(); // printer: ab701e6d-d81d-44fd-b021-e57e58fa5b59

?>

Ok, chạy