What is the difference between synchronous and asynchronous in PHP
This article mainly introduces "what is the difference between PHP synchronization and asynchronous". In daily operation, I believe many people have doubts about what is the difference between PHP synchronization and asynchronous. Xiaobian consulted all kinds of information and sorted out simple and easy to use operation methods. I hope to answer the doubts of "what is the difference between PHP synchronization and asynchronous"! Next, please follow the small series to learn together!
The difference between PHP synchronization and asynchronous: 1, traditional synchronous programming is a request response model, and asynchronous programming has to reconsider whether to respond to the problem;2, synchronous means that there is a sequence between multiple tasks, and asynchronous means that there is no sequence between multiple tasks, and can be executed at the same time.
Operating environment: Windows 7 system, PHP7.1 version, DELL G3 computer
Difference between PHP synchronous and asynchronous
Synchronization: Multiple tasks are executed in sequence, and the next one can only be executed after one is executed.
Asynchronous: there is no order between multiple tasks, can be executed at the same time, sometimes a task may have to obtain the results of another task executed at the same time when necessary, this is called callback!
Traditional synchronous programming is a request-response model that calls a method and waits for its response to return.
Asynchronous programming is about rethinking the question of whether or not you need to respond, that is, narrowing down where you need to respond. Because the faster you get a response, the more synchronized, sequential, transactional, and poor performance you get.
Asynchronous programming is usually implemented by fire and forget, forgetting to do something else after launching the event, without waiting for the response result just launched. (The place where the event is emitted is called the producer, and the processor who responds to the event at another place is called the consumer). Asynchronous programming is event-driven programming, which requires a complete change of thinking, from "request-response" thinking to "event-driven" thinking, which is a change in software programming thinking.
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