Is there a way to implement multi-threading in PHP? Suppose you are writing a PHP application based on multiple servers. Ideally, you would send requests to multiple servers at the same time, rather than one after another. Is it possible? When someone wants to implement concurrency functions, they usually think of using fork or spawn threads, but when they find that PHP does not support multi-threading, they may change their minds and use some not good enough languages, such as Perl.
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