kikikan/backend/app/Http/Controllers/Controller.php

<?php

namespace App\Http\Controllers;

use Illuminate\Foundation\Auth\Access\AuthorizesRequests;
use Illuminate\Foundation\Bus\DispatchesJobs;
use Illuminate\Foundation\Validation\ValidatesRequests;
use Illuminate\Routing\Controller as BaseController;

class Controller extends BaseController
{
    use AuthorizesRequests, DispatchesJobs, ValidatesRequests;

    /**
     * UUID 生成
     * @return string
     * @throws \Exception
     */
    public function uuidv4 () : string
    {
        $chars = str_split('xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx');

        foreach ($chars as $i => $char) {
            if ($char === 'x') {
                $chars[$i] = dechex(random_int(0, 15));
            } elseif ($char === 'y') {
                $chars[$i] = dechex(random_int(8, 11));
            }
        }

        return implode('', $chars);
    }
}