# 搭建Echo服务器 --- [TOC] 所有讲解网络通信编程的书籍都会最先讲解如何编写一个Echo服务器，本书也不例外。本章将讲解如何快速编写一个基于Swoole扩展的Echo服务器。 ## 服务端 创建一个`Server.php`文件并输入如下内容： ```php // 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, )); $this->serv->on('Start', array($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"; $serv->send($fd, $data); } public function onClose( $serv, $fd, $from_id ) { echo "Client {$fd} close connection\n"; } } // 启动服务器 $server = new Server(); ``` ## 客户端 创建一个`Client.php`文件并输入如下内容： ```php <?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: {$this->client->errMsg}[{$this->client->errCode}]\n"; } fwrite(STDOUT, "请输入消息："); $msg = trim(fgets(STDIN)); $this->client->send( $msg ); $message = $this->client->recv(); echo "Get Message From Server:{$message}\n"; } } $client = new Client(); $client->connect(); ``` ## 运行 在Terminal下执行命令`php Server.php`即可启动服务器，在另一个Terminal下执行`php Client.php`，输入要发送的内容，即可发送消息到服务器，并收到来自服务器的消息。