PHP 높은 동시성 처리를 최적화하는 방법

class ConnectionPool {
    private static $instance;
    private $connections = [];

    private function __construct(){}

    public static function getInstance() {
        if (!self::$instance) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function getConnection() {
        if (count($this->connections) > 0) {
            return array_shift($this->connections);
        }
        return $this->createConnection();
    }

    public function releaseConnection($connection) {
        $this->connections[] = $connection;
    }

    private function createConnection() {
        // 创建数据库连接
        return $connection;
    }
}

$pool = ConnectionPool::getInstance();

for ($i = 0; $i < 100; $i++) {
    $connection = $pool->getConnection();
    // 处理请求
    $pool->releaseConnection($connection);
}

$redis = new Redis();
$redis->connect('127.0.0.1', 6379);

$key = 'data_key';

// 从缓存读取数据
$data = $redis->get($key);

if (!$data) {
    // 若缓存中不存在数据，从数据库中读取数据
    $data = /* 从数据库中读取数据的代码 */;

    // 将数据存入缓存
    $redis->set($key, $data);
}

// 处理请求

go(function () {
    $httpClient = new SwooleCoroutineHttpClient('example.com', 80);
    $httpClient->set(['timeout' => 1]);
    $httpClient->get('/path', function ($httpClient) {
        // 请求完成后的回调处理
        $response = $httpClient->getBody();
        // 处理响应
    });
});