Explain CAP theorem, consistency models, and distributed systems tradeoffs in PHP architectures.

CAP theorem states distributed systems can only fully guarantee two of Consistency, Availability, and Partition Tolerance simultaneously.

As PHP systems scale globally, they evolve into distributed systems. Distributed systems introduce unavoidable tradeoffs.

CAP theorem:

C = Consistency Every node sees the same data simultaneously.

A = Availability Every request receives a response.

P = Partition Tolerance System continues operating despite network failures.

In distributed environments, network partitions are inevitable. Therefore systems must choose between:

Consistency models:

1.…