?php
/**
 * 创建多进程
 */
$worker_num     = 6;    // 默认进程数
$workers       = [];    // 进程保存
$redirect_stdout  = false;  // 重定向输出 ; 这个参数用途等会我们看效果
for($i = 0; $i  $worker_num; $i++){
  $process = new swoole_process('callback_function', $redirect_stdout);
  // 启用消息队列 int $msgkey = 0, int $mode = 2
  $process->useQueue(0, 2);
  $pid = $process->start();
  // 管道写入内容
  $process->write('index:'.$i);
  $process->push('进程的消息队列内容');
  // 将每一个进程的句柄存起来
  $workers[$pid] = $process;
}
/**
 * 子进程回调
 * @param swoole_process $worker [description]
 * @return [type]         [description]
 */
function callback_function(swoole_process $worker)
{
  $recv = $worker->pop();
  echo "子输出主内容: {$recv}".PHP_EOL;
  //get guandao content
  $recv = $worker->read();
  $result = doTask();
  echo PHP_EOL.$result.'==='.$worker->pid.'==='.$recv;
  $worker->exit(0);
}
/**
 * 监控/回收子进程
 */
while(1){
  $ret = swoole_process::wait();
  if ($ret){// $ret 是个数组 code是进程退出状态码，
    $pid = $ret['pid'];
    echo PHP_EOL."Worker Exit, PID=" . $pid . PHP_EOL;
  }else{
    break;
  }
}
/**
 * doTask
 * @return [type] [description]
 */
function doTask()
{
  sleep(2);
  return true;
}