What is a practical use for PHP's sleep()?

Question

I just had a look at the docs on sleep().

Where would you use this function?

Is it there to give the CPU a break in an expensive function?

Any common

Answer 1

I wouldn't typically use it for serving web pages, but it's useful for command line scripts.

$ready = false;
do {
  $ready = some_monitor_function();
  sleep(2);
} while (!$ready);