composer require "khanhicetea/psr7-session"
It's built on top Symfony HTTP Foundation, so you can use Symfony SessionHandler excepts NativeSessionHandler
This demo below is use RedisHandler
$redis = new \Redis();
$redis->connect('redis_server', 6379, 3);
$redis_handler = new \Psr7Session\Handler\RedisHandler($redis, 3600);
$middleware = SessionMiddleware::create()
->name('I_am_cookie_plz_dont_eat_me')
->httpOnly()
->maxAge(3600)
->handler($redis_handler);
$slim_app->add($middleware);
Use Session object
use Psr7Session\Middleware as SessionMiddleware;
$session = SessionMiddleware::getSession($request);
$default = 123;
$value = $session->get('key', $default);
$value++;
$session->set('key', $value);