Hello,

rediss:// DSL scheme is for TLS connexion to Redis Server.
You support rediss keyword but not TLS connexion.

https://github.com/predis/predis

$client = new Predis\Client('tls://127.0.0.1');

https://github.com/phpredis/phpredis

$redis->connect('tls://127.0.0.1', 6379); // enable transport level security.

When i use rediss:// scheme, the Redis connection still use tcp scheme.