<?php// ===== 全局變量 =====// ipc進程間通訊$key = ftok(__FILE__, "a");$queue = msg_get_queue($key);// 進程ID$producer_pid = 0;$consumers_pid = array();$collector_pid = posix_getpid();// ===== 消費者 =====for ($i=0; $i < 2; $i++) {  $consumer_pid = pcntl_fork();  if ($consumer_pid == -1) {    exit("could not fork!/n");  } else if ($consumer_pid) {    // pcntl_wait($status);    echo "consumer_pid: $consumer_pid/n";    $consumers_pid[] = $consumer_pid;  } else {    $pid = posix_getpid();    echo "consumer_pid: $pid start/n";    while (true) {      msg_receive($queue, $pid, $msgtype, 1024, $message);      if ($message == "exit") {        break;      }      // 數據處理      $n = intval($message);      msg_send($queue, $collector_pid, $n * $n);    }    exit("consumer ok!/n");  }}// ===== 產生者 =====$producer_pid = pcntl_fork();if ($producer_pid == -1) {  exit("could not fork!/n");} else if ($producer_pid) {  // pcntl_wait($status);  echo "producer_pid: $producer_pid/n";} else {  $pid = posix_getpid();  echo "producer_pid: $pid start/n";  $n = 0;  for ($i=0; $i < 10; $i++) {    foreach ($consumers_pid as $consumer_pid) {      $n++;      msg_send($queue, $consumer_pid, $n);    }    sleep(1);  }  foreach ($consumers_pid as $consumer_pid) {    msg_send($queue, $consumer_pid, "exit");  }  sleep(1);  msg_send($queue, $collector_pid, "exit");  exit("producer ok!/n");}// ===== 收集器 =====while (true) {  msg_receive($queue, $collector_pid, $msgtype, 1024, $message);  if ($message == "exit") {    break;  }  echo sprintf("% 5d: %d/n", $msgtype, $message);}exit("collector ok!/n");