php swoole多进程/多线程例子

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swoole的多线程其实就是多进程，进程创建太多切换的开销很大，如果能用上pthreads建议用pthreads，因为我用的是php7nts版本没办法用pthreads

swoole实例如下：

<?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;}

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