When looking at PHP as used in enterprise class applications, we can see
the following happening. Let imagine that we have a site that gets a
1000 requests per second. That seems to be a good candidate for
threading so as to be able to handle the 1000 requests per second. The
site runs PHP and Apache. Well, what happens? Each request coming in is
handed of to a separate instance of Apache. Thus the site would be able
to process many requests simultaneously. It looks as if parallel
computing is taking place here, which looks much like threading. Even
though PHP itself does not know about threads, and does not need to, I
think, the whole process of handling the 1000 requests per second uses
parallel computing. There are no performance bottle-necks here. Teus.

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