alex alex - 3 months ago 31
PHP Question

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

I just had a look at the docs on


Where would you use this function?

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

Any common pitfalls?


One place where it finds use is to create a delay.

Lets say you've built a crawler that uses curl/file_get_contents to get remote pages. Now you don't want to bombard the remote server with too many requests in short time. So you introduce a delay between consecutive requests.

sleep takes the argument in seconds, its friend usleep takes arguments in microseconds and is more suitable in some cases.