Sometimes in web programming, you might need to run (or fork as they say) processes in the background so the web user doesn’t see all of the processing time plus it can potentially “freeze” the webpage on long data processing features of the site.
For that, you can always fork more processes.
The usual line I use is: exec ("/usr/bin/php proc.php >/dev/null 2<&1");
The problem I incurred with above line was that processes were forked except there was still some delay that the visitors saw.
To fix the issue so there’s absolutely no