PHP中多线程处理的方法

<?php namespace App\Console\Commands;trait PcntlTrait
{    private $workers = 1;    public function worker($count)
    {
        $this->workers = $count;
    }    public function pcntl_call($all, \Closure $callback)
    {
        $perNum = ceil(count($all) / $this->workers);

        $pids = [];        for($i = 0; $i < $this->workers; $i++){
            $pids[$i] = pcntl_fork();            switch ($pids[$i]) {                case -1:                    echo "fork error : {$i} \r\n";                    exit;                case 0:
                    $data = [];                    try {
                        $data = $callback(array_slice($all, $i * $perNum, $perNum));
                    } catch(\Exception $e) {                        echo ($e->getMessage());
                    }

                    $shm_key = ftok(__FILE__, 't') . getmypid();
                    $data = json_encode($data);
                    $shm_id = shmop_open($shm_key, "c", 0777, strlen($data) + 10);
                    shmop_write($shm_id, $data, 0);
                    shmop_close($shm_id);                    exit;                default:                    break;
            }
        }        // only master process will go into here
        $ret = [];        foreach ($pids as $i => $pid) {            if($pid) {
                pcntl_waitpid($pid, $status);

                $shm_key = ftok(__FILE__, 't') . $pid;
                $shm_id = shmop_open($shm_key, "w", 0, 0);

                $data = trim(shmop_read($shm_id, 0, shmop_size($shm_id)));
                $data = json_decode($data, true);
                $ret = array_merge($ret, $data);
                @shmop_close($shm_id);
                @shmop_delete($shm_id);
            }
        }        return $ret;
    }
}

<?phpuse App\Console\Commands\PcntlTrait;class PcntlImp
{        use PcntlTrait;
}class TestPcntlTrait extends \TestCase
{    public function setup()
    {
        $this->createApplication();
    }    public function testPcntlCall()
    {
        $arr = [1,2,3,4,5,6,7,8,9,10];
        $imp = new \PcntlImp();
        $imp->worker(2);
        $data = $imp->pcntl_call($arr, function($info){            if (empty($info)){                return [];
            }
            $ret = [];            foreach ($info as $item) {
                $ret[] = $item * $item;
            }            return $ret;
        });
        $this->assertEquals(10, count($data));
        $this->assertEquals(25, $data[4]);
    }
}