includes updated PHP bindings. last time i looked at this, the 2002 vintage discouraged me

Spread is an open source toolkit that provides a high performance messaging service that is resilient to faults across local and wide area networks. Spread functions as a unified message bus for distributed applications, and provides highly tuned application-level multicast, group communication, and point-to-point support. Spread services range from reliable messaging to fully ordered messages with delivery guarantees.

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