Devise\Support\Installer\InstallWizard::saveNewApplicationKey PHP Метод

    public function saveNewApplicationKey()
    {
        $env = $this->EnvironmentFileManager->get();
        if (!array_key_exists('APP_KEY', $env)) {
            $this->EnvironmentFileManager->merge(['APP_KEY' => str_random(32)]);
        }
    }