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41. Async PHP (ReactPHP/Amp/Swoole)

Non-blocking I/O in PHP.

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Traditional PHP is synchronous and blocking per request, but libraries like ReactPHP, Amp, and runtimes like Swoole/OpenSwoole provide event loops enabling non-blocking I/O, concurrent HTTP clients, and long-running servers within a single PHP process. Promises or coroutines (often built atop Fibers) let async code read in a mostly linear style.

These approaches are especially valuable for high-concurrency services like WebSocket servers, real-time APIs, or apps that need to fan out many simultaneous outbound HTTP/RPC calls efficiently instead of spawning many blocking processes.

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Check your understanding

1. What core mechanism do async PHP libraries rely on to avoid blocking?
Multiple serversAn event loop with non-blocking I/OIncreasing max_execution_timeDisabling OPcache
2. Which PHP extension/runtime provides a coroutine-based server model?
SwoolePDOcURLOPcache

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