$process = new swoole_process(function(){

    //这里写业务代码

},true)

//开启进程，返回进程pid

$pid = $process->start();

//模拟用进程管理同时请求多个url

$workers = [];

$urls = [

    'http://www.baidi.com',

    'http://www.google.com',

    'http://www.sina.com.cn',

    'http://www.qq.com',

    'http://www.cnblog.com'

];

foreach ($urls as $i => $url) {

    $process = new swoole_process(function($worker) use($urls,$i){

        $content = curlData($urls[$i]);

        //向管道中写入数据

        $worker->write($content);

        //echo $content;   //使用echo可以达到一样的效果

    },true);

    $pid = $process->start();

    //将创建好的进程保存在数组中

    $workers[$pid] = $process;

}

// ---------- 等待所有进程结束后再执行后面代码 ---------

foreach ($workers as $process) {

    //从管道中读取数据

    echo $process->read();

    //回收子进程

    $process::wait();

}

//模拟请求数据过程

function curlData($url){

    sleep(1);

    return $url ."SUCCESS" . PHP_EOL;

}

$process = new swoole_process('callback_function', true);

$pid = $process->start();

function callback_function(swoole_process $worker)

{

    $worker->exec('/usr/local/bin/php',array(__DIR__.'/swoole_server.php'));

}