How to use a process as a daemon in PHP_PHP Tutorial

The examples in this article describe how PHP uses processes as daemons. Share it with everyone for your reference. The specific analysis is as follows:

Usage of posix_setsid() in php

The documentation explanation is “Make the current process a session leader”

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

It means that the process that calls this function between a process group (parent process and child process) 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 documentation: