Swoole

Coroutines allow writing asynchronous code in a familiar synchronous manner, as shown in the HTTP service example where `file_get_contents` is used without callbacks for concurrent requests.

Runtime hooks transform standard blocking PHP functions like PDO, Redis, and `sleep` into non-blocking operations with `Swoole\Runtime::enableCoroutine()`, enabling massive concurrency as demonstrated in benchmark scripts.

Provides coroutine-enabled servers for HTTP/1.1, HTTP/2, WebSocket, and TCP/UDP, allowing mixed services on a single event loop, illustrated in the mixed server code snippet.

Implements CSP with channels for safe inter-coroutine communication, ideal for connection pools and producer-consumer patterns, as shown in the Redis pool implementation handling 1000 concurrent requests.