php实现简单的守护进程创建、开启与关闭操作

本文实例讲述了php实现简单的守护进程创建、开启与关闭操作。分享给大家供大家参考，具体如下：

前提要安装有pcntl扩展，可通过php -m查看是否安装

<?php
class daemon {
  private $pidfile;
  function __construct() {
    $this->pidfile = dirname(__file__).'/daemontest.pid';
  }
  private function startdeamon() {
    if (file_exists($this->pidfile)) {
      echo "the file $this->pidfile exists.\n";
      exit();
    }
    $pid = pcntl_fork();
    if ($pid == -1) {
      die('could not fork');
    } else if ($pid) {
      echo 'start ok';
      exit($pid);
    } else {
    // we are the child
      file_put_contents($this->pidfile, getmypid());
      return getmypid();
    }
  }
  private function start(){
    $pid = $this->startdeamon();
    while (true) {
      file_put_contents(dirname(__file__).'/test.txt', date('y-m-d h:i:s'), file_append);
      sleep(2);
    }
  }
  private function stop(){
    if (file_exists($this->pidfile)) {
      $pid = file_get_contents($this->pidfile);
      posix_kill($pid, 9);
      unlink($this->pidfile);
    }
  }
  public function run($argv) {
    if($argv[1] == 'start') {
      $this->start();
    }else if($argv[1] == 'stop') {
      $this->stop();
    }else{
      echo 'param error';
    }
  }
}
$deamon = new daemon();
$deamon->run($argv);

启动

php deamon.php start

关闭

php deamon.php stop