ManaPHP\Security\Random::getByte PHP Метод

    public function getByte($length)
    {
        if (function_exists('random_bytes')) {
            return random_bytes($length);
        } elseif (function_exists('openssl_random_pseudo_bytes')) {
            return openssl_random_pseudo_bytes($length);
        } elseif (file_exists('/dev/urandom')) {
            $handle = fopen('/dev/urandom', 'rb');
            stream_set_read_buffer($handle, 0);
            $r = fread($handle, $length);
            fclose($handle);
            return $r;
        } else {
            $r = '';
            do {
                $r .= pack('L', mt_rand());
            } while (strlen($r) < $length);
            return substr($r, 0, $length);
        }
    }