PHP 多進程處理任務

PHP 多進程處理任務

pcntl 模塊（非 Unix 類系統不支持此模塊）

一個 PHP 多進程簡單例子大概是這個樣子：

// 5 個子進程處理任務
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 { // 子進程處理
        echo "I'm the Child $i\n";
        // 業務處理
        exit($i); // 必定要注意退出子進程，不然 pcntl_fork() 會被子進程再 fork，帶來處理上的影響。
    }
}

// 等待子進程執行結束
while (pcntl_waitpid(0, $status) != -1) {
    $status = pcntl_wexitstatus($status);
    echo "Child $status completed\n";
}

固然實際應用中咱們不可以這樣輸出代碼，不夠健壯，也不夠優雅，我因此找了個基於 pcntl 封裝的擴展包來使用。

spatie/async - 基於 pcntl 封裝的擴展包

如下是我使用 spatie/async 來優化一個多進程請求的例子

原代碼（耗時 20s 左右）- https://github.com/guanguans/...：

/**
 * @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;
}

改進後（耗時 4s 左右）- https://github.com/guanguans/...：

/**
 * @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;
}

相關連接

• https://www.php.net/manual/zh/book.pcntl.php
• https://github.com/spatie/async
• https://github.com/guanguans/music-php

原文連接

• https://github.com/guanguans/guanguans.github.io