问题
Can anybody tell me why using the pcntl lib on production servers is discouraged? The PHP manual tells very briefly about it, and I'm in a dire need to use this library... Is there another way to do the same thing in php?
回答1:
pcntl is discouraged in production environments because the functionality it supports (fork, process control, signal handling) are fairly explicitly things you should not be using in a CGI style application. Now, if you're writing a daemon or command line application in PHP, that is another matter...
From the PHP manual:
Process Control should not be enabled within a web server environment and unexpected results may happen if any Process Control functions are used within a web server environment.
回答2:
one has to be clear about the differences of a php cli script and a sapi/cgi script. php on production systems may as well have support for pcntl.
the important thing here is to have 2 php config files. one for cli and one for cgi setup. one then has to disable pctnl in the cgi setup because the real security issue is, that forking a script when executed by the webserver may leave zombie processes flooding the system.
in a cli environment it might be necessary to be able to write scripts that fork...
来源：https://stackoverflow.com/questions/4899680/why-is-the-use-of-pcntl-library-in-php-is-discouraged-on-prod-serv