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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