Explain advanced distributed locking and concurrency control in PHP systems.

Distributed locking coordinates concurrent operations across multiple servers to prevent race conditions and data corruption.

Concurrency problems become severe in distributed systems.

Examples:

Distributed locking coordinates access across nodes.

Core approaches:

Examples:

Low-latency distributed coordination.

Strong coordination systems.

Version checks instead of locking.

Explicit locking before updates.

Critical distributed concepts:

Circular waiting between resources.

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