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This article mainly explains "how PHP realizes asynchronous operation". The explanation content in this article is simple and clear, easy to learn and understand. Please follow the ideas of Xiaobian slowly and deeply to study and learn "how PHP realizes asynchronous operation" together!

1. Why does PHP need asynchronous operations?

Generally speaking, PHP is suitable for web page display and other time-consuming tasks. If it takes more time to operate, such as resizing images, importing large data, sending EDM in batches, SMS, etc., it is easy to have operation timeout. You can say I can set an infinite timeout, etc. You should also know that PHP has a working mode that is fastcgi, PHP infinite does not timeout, does not mean fastcgi does not timeout accordingly…If you still want to say fastcgi corresponding never timeout, I suggest you should discuss it with your O & M staff…You will get a reply that will be fuck you!!!

At this point asynchronous operations play their role, because it is a non-blocking operation, the operation will immediately return, and then slowly work in the background. Regardless of whether you timeout or not, I am not working under the current process/thread. See, isn't it beautiful, but it's actually a pit...

Can PHP perform asynchronous operations?

The answer is yes, but all kinds of pure PHP implementation on the Internet is a bit awkward. socket mode, suspend process mode, and some directly fork processes. Very good, all gods show their powers. If the operation and maintenance personnel see it, they will definitely kill you. It will be strange if you don't run the web server to death.

Is there a better way to implement this asynchronous operation? Yes, now we just have to figure out how to open the cheat. Check PECL mainstream plug-in program has a bunch of rabbitMQ (message queue), one of which is used for task allocation plug-in into our line of sight Gearman(actually this guy is the corner, I will not introduce in detail, gearman http://www.ttlsa.com/? s=gearman&searchsubmit=Search)。

3. Why choose Gearman?

Let's not talk about anything else, just say that he has many clients, supports clients in many languages, and you can write workers in most of the languages you like. I personally am very tired of language disputes, you like to write worker in god code language as you like. There is data persistence support (that is, save the queue to the database media, and that is also a disaster recovery), and there is clustering support (in fact, many rabbitMQ have these features). There are extensions on PECL as well as pure PHP implementations. Anyway, this Gearman had lived for a long time, and the miscellaneous problems had basically been solved.

With Gearman, this plug-in is much easier. That is to send a task to gearman, send out the task to be executed, and then wait for the worker to call PHP cli to run our PHP code.

Thank you for reading, the above is "PHP how to achieve asynchronous operation" of the content, after the study of this article, I believe we have a deeper understanding of PHP how to achieve asynchronous operation this problem, the specific use of the situation also needs to be verified by practice. Here is, Xiaobian will push more articles related to knowledge points for everyone, welcome to pay attention!

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