PHP与多任务或并发的关系十分复杂。
PHP has a complex relationship with multitasking or concurrency.
这是程序进行多任务处理或并发处理来自多个请求的结果的方法。
This is how the program multitasks or concurrently processes results from several requests.
事件是一个不同的并发概念，对管理 I/O 和相关的多任务职责很有用。
Events are a distinct concurrency concept useful for managing I/O and related multi-tasking responsibilities.
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