官方定义：
PHP的异步、并行、高性能网络通信引擎，使用纯C语言编写，提供了PHP语言的异步多线程服务器，异步TCP/UDP网络客户端，异步MySQL，异步Redis，数据库连接池，AsyncTask，消息队列，毫秒定时器，异步文件读写，异步DNS查询。 Swoole内置了Http/WebSocket服务器端/客户端、Http2.0服务器端。
Swoole可以广泛应用于互联网、移动通信、企业软件、云计算、网络游戏、物联网、车联网、智能家居等领域。 使用PHP+Swoole作为网络通信框架，可以使企业IT研发团队的效率大大提升，更加专注于开发创新产品。
swoole 扩展安装及案例来源：http://wiki.swoole.com/wiki/page/6.html
简单案例：
<?phpclass Server{ private $serv; public function __construct() { $this->serv = new swoole_server("0.0.0.0", 9501); $this->serv->set(array( 'worker_num' => 8, 'daemonize' => false, 'max_request' => 10000, 'dispatch_mode' => 2, 'debug_mode' => 1 )); $this->serv->on('Start', array($this, 'onStart')); $this->serv->on('Connect', array($this, 'onConnect')); $this->serv->on('Receive', array($this, 'onReceive')); $this->serv->on('Close', array($this, 'onClose')); $this->serv->start(); } public function onStart($serv) { echo "Startn"; } public function onConnect($serv, $fd, $from_id) { $serv->send($fd, "Hello {$fd}!"); } public function onReceive(swoole_server $serv, $fd, $from_id, $data) { echo "Get Message From Client {$fd}:{$data}n"; } public function onClose($serv, $fd, $from_id) { echo "Client {$fd} close connectionn"; }}// 启动服务器$server = new Server();
<?phpclass Client{ private $client; public function __construct() { $this->client = new swoole_client(SWOOLE_SOCK_TCP); } public function connect() { if (!$this->client->connect("127.0.0.1", 9501, 1)) { echo "Error: {$fp->errMsg}[{$fp->errCode}]n"; } $message = $this->client->recv(); echo "Get Message From Server:{$message}n"; fwrite(STDOUT, "请输入消息："); $msg = trim(fgets(STDIN)); $this->client->send($msg); }}$client = new Client();$client->connect();
分别打开两个终端输入：php server.php php client.php 即可看到效果！