Explain advanced API throttling and adaptive traffic control systems in distributed PHP environments.

Adaptive throttling dynamically adjusts request limits based on system load, protecting infrastructure while maximizing throughput.

Static rate limits are insufficient in dynamic systems. Adaptive throttling adjusts limits in real time based on system health.

Core concepts:

Adjust limits based on CPU, memory, latency.

Critical users get higher quotas.

Requests queued instead of dropped.

Refill rate changes with system state.

Limits enforced across multiple regions.

Signals used:

Challenges:…