构建一个Swoole基本实例

下面贴一个基本的基于swoole的echo服务器

// Server
class 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 "Start\n";
    }

    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 connection\n";
    }
}
// 启动服务器
$server = new Server();

从代码中可以看出，创建一个swoole_server基本分三步： 1. 通过构造函数创建swoole_server对象 2. 调用set函数设置swoole_server的相关配置选项 3. 调用on函数设置相关回调函数关于set配置选项以及on回调函数的具体说明，请参考我整理的swoole文档( 配置选项)

这里只给出简单介绍。onStart回调在server运行前被调用，onConnect在有新客户端连接过来时被调用，onReceive函数在有数据发送到server时被调用，onClose在有客户端断开连接时被调用。这里就可以大概看出如何使用swoole：在onConnect处监听新的连接;在onReceive处接收数据并处理，然后可以调用send函数将处理结果发送出去;在onClose处处理客户端下线的事件。

下面贴出客户端的代码：

<?php
class 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();