How PHP uses a process as a daemon

Editor to share with you how the PHP process as a daemon, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's learn about it!

The specific analysis is as follows:

The usage of posix_setsid () in php

The document is interpreted as "Make the current process a session leader"

Reference document: http://linux.die.net/man/2/setsid

It means that the process that calls this function between a process group (parent and child) will be elected as the leader of the process group

So the way to make a process a daemon is:

1 fork out a child process

2 in the child process posix_setsid ()

3 exit the parent process

There is an example in the document:

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