看看PHP 多进程处理任务

pcntl 模块（非 Unix 类系统不支持此模块）

一个 PHP 多进程简单例子大概是这个样子：

// 5 个子进程处理任务for ($i = 0; $i < 5; $i++) {
    $pid = pcntl_fork();    if ($pid == -1) {        die(Could not fork);
    } elseif ($pid) {        echo I'm the Parent $i\n;
    } else { // 子进程处理
        echo I'm the Child $i\n;        // 业务处理
        exit($i); // 一定要注意退出子进程，否则 pcntl_fork() 会被子进程再 fork，带来处理上的影响。
    }
}// 等待子进程执行结束while (pcntl_waitpid(0, $status) != -1) {
    $status = pcntl_wexitstatus($status);    echo Child $status completed\n;
}复制代码

当然实际应用中我们不能够这样输出代码，不够健壮，也不够优雅，我所以找了个基于 pcntl 封装的扩展包来使用。

spatie/async - 基于 pcntl 封装的扩展包

以下是我使用 spatie/async 来优化一个多进程请求的例子

原代码（耗时 20s 左右）- github.com/guanguans/m…

/**
 * @param string $keyword
 *
 * @return array
 */public function searchAll(string $keyword): array{
    $songall = [];    foreach ($this->platforms as $platform) {
        $songall = array_merge($songall, $this->search($platform, $keyword));
    }    return $songall;
}/**
 * @param string $platform
 * @param string $keyword
 *
 * @return mixed
 */public function search(string $platform, string $keyword){
    $meting = $this->getMeting($platform);

    $songs = json_decode($meting->format()->search($keyword), true);    foreach ($songs as $key => &$song) {
        $detail = json_decode($meting->format()->url($song['url_id']), true);        if (empty($detail['url'])) {            unset($songs[$key]);
        }
        $song = array_merge($song, $detail);
    }    unset($song);    return $songs;
}复制代码

改进后（耗时 4s 左右）- github.com/guanguans/m…

/**
 * @param string $keyword
 *
 * @return array
 */public function searchAll(string $keyword): array{
    $songall = [];
    $pool = Pool::create();    foreach ($this->platforms as $platform) {
        $pool->add(function () use ($platform, $keyword) {            return $this->search($platform, $keyword);
        }, $this->getSerializedOutput())->then(function ($output) use (&$songall) {
            $songall = array_merge($songall, $output);
        })->catch(function (\Throwable $exception) {            exit($exception->getMessage());
        });
    }
    $pool->wait();    return $songall;
}/**
 * @return mixed
 */public function search(string $platform, string $keyword){
    $meting = $this->getMeting($platform);
    $songs = json_decode($meting->format()->search($keyword), true);

    $pool = Pool::create();    foreach ($songs as $key => &$song) {
        $pool->add(function () use ($meting, $song) {            return json_decode($meting->format()->url($song['url_id']), true);
        })->then(function ($output) use (&$songs, &$song, $key) {
            $song = array_merge($song, $output);            if (empty($song['url'])) {                unset($songs[$key]);
            }
        })->catch(function (\Throwable $exception) {            exit($exception->getMessage());
        });
    }    unset($song);
    $pool->wait();    return $songs;
}复制代码

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