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 $in";     } else { // 子进程处理         echo "I'm the Child $in";        // 业务处理         exit($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 completedn"; }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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