Scache is alternate approach to PHP sessions
Maybe advertisement someday to pay this server.
Scache is high performance session manager for distributed web applications' session data. SCache provides both persistent and on-demand expiring key-value storage with structured filesystem-like keyspace for referencing the data.
Scache gives more flexible control to your session than plain $_SESSION can provide. It is designed to give tools for inter client communication and sharing data between web applications clients.
Scache consists of freely available GPLv3 distributed PHP-extension and backend server. Having very small system footprint, it is suitable from small embedded setups to large clustered php applications requiring fast simultaneous lockless access to common transient data.