server:

class Server
{
private $_serv = null;

private $_workers = [];

private $_worker_num = 2;

public function __construct()
{
$this->_serv = new swoole_server('127.0.0.1', 9501);

$this->_serv->on('start', array($this, 'onStart'));
$this->_serv->on('workerstart', array($this, 'onWorkerStart'));
$this->_serv->on('connect', array($this, 'onConnect'));
$this->_serv->on('receive', array($this, 'onReceive'));
$this->_serv->on('close', array($this, 'onClose'));

$this->_serv->start();
}

public function onStart($serv)
{
echo "start \n";
}

public function onWorkerStart($serv, $worker_id)
{
echo "worker start\n";
}

public function onConnect($serv, $fd, $from_id )
{
echo "connect..\n";
}

public function onReceive(swoole_server $serv, $fd, $from_id, $data)
{

for ($i = 0; $i < $this->_worker_num ;$i++) {
$process = new swoole_process(array($this, 'onProcess'), false, false);
$process->useQueue();
$pid = $process->start();
echo $pid;
$this->_workers[$pid] = $process;
}

foreach ($this->_workers as $pid => $worker) {
echo $process->push("hello worker[{$pid}]\n");
sleep(2);//停2秒，不然主进程pop时 获取消息太快，而阻塞状态了，push完给子进程消息，子进程逻辑还没处理完
//(1)不加这停两秒时，可能主进程马上pop时，队列是空的，主进程阻塞状态了，下面子进程只能pop和push一次，再pop时也阻塞状态了
//客户端再发send消息时,服务器不响应，除非新client进来，发send，主进程阻塞取消了，第一个客户端又可以发send消息了，第二个客户端
//发send消息时，服务端不响应，这种情况发生了

$result = $process->pop();//默认模式下，如果队列中没有数据，pop方法会阻塞等待
echo "From worker: $result\n";//这里主进程，接受到的子进程的数据
}

for($i = 0; $i < $this->_worker_num; $i++)
{
$ret = swoole_process::wait();
$pid = $ret['pid'];
unset($this->_workers[$pid]);
echo "Worker Exit, PID=".$pid.PHP_EOL;
}

}

public function onProcess($worker)
{
$msg_status = $worker->statQueue();
if($msg_status['queue_num'] > 0)
{
$recv = $worker->pop();

echo "FROM master {$recv}\n";
$worker->push("heheh parent");//子进程处理完逻辑，不是马上push数据给主进程 sleep(2)
}
$worker->exit(0);

}

public function onClose($serv, $fd, $from_id)
{
echo "close.\n";
}
}

new Server();


client:

$cli = new Swoole_client(SWOOLE_SOCK_TCP);

$cli->connect('127.0.0.1', 9501, 1);

fwrite(STDOUT, '输入消息：');
$msg = trim(fgets(STDIN));

echo $cli->send($msg);

echo $cli->recv()."\n";