/**

     * Create a new session instance.

     *

     * @param  string $name

     * @param  \SessionHandlerInterface $handler

     * @param  string|null $id

     * @return void

     */

    public function __construct($name, SessionHandlerInterface $handler, $id = null)

    {

        $this->setId($id);

        $this->name = $name;

        $this->handler = $handler;

    }

    /**

     * Set the session ID.

     *

     * @param  string  $id

     * @return void

     */

    public function setId($id)

    {

        $this->id = $this->isValidId($id) ? $id : $this->generateSessionId();

    }

    /**

     * Get a new, random session ID.

     *

     * @return string

     */

    protected function generateSessionId()

    {

        return Str::random(40);

    }

    /**

     * Generate a more truly "random" alpha-numeric string.

     *

     * @param  int  $length

     * @return string

     */

    public static function random($length = 16)

    {

        $string = '';

        while (($len = strlen($string)) < $length) {

            $size = $length - $len;

            $bytes = random_bytes($size);

            $string .= substr(str_replace(['/', '+', '='], '', base64_encode($bytes)), 0, $size);

        }

        return $string;

    }