Explain advanced API resiliency patterns (circuit breakers, retries, bulkheads) in PHP systems.

Resiliency patterns prevent cascading failures in distributed PHP systems by controlling retries, isolating failures, and protecting services.

Distributed systems fail frequently due to network instability, dependency overload, or partial outages.

Core resiliency patterns:

Stops calling failing services temporarily.

States:

Retries failed requests with exponential delay.

Isolates resources into compartments.

Prevents hanging requests.

Provide degraded responses.

Protects services from overload.

Challenges:…