PHP uses process as daemon process, php process daemon_PHP tutorial

PHP uses the process as a daemon process, php process daemon

This article describes the example of PHP using the process as a daemon process. 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:

<&#63;php
  $pid = pcntl_fork(); // fork
  if ($pid < 0)
    exit;
  else if ($pid) // parent
    exit;
  else { // child
    $sid = posix_setsid();
    if ($sid < 0)
      exit;
    for($i = 0; $i <= 60; $i++) {//do something for 5 minutes
      sleep(5);
    }
  }
&#63;>

I hope this article will be helpful to everyone’s PHP programming design.