# 搭建Echo服務器 --- [TOC] 所有講解網絡通信編程的書籍都會最先講解如何編寫一個Echo服務器，本書也不例外。本章將講解如何快速編寫一個基于Swoole擴展的Echo服務器。 ## 服務端 創建一個`Server.php`文件并輸入如下內容： ```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"; } } // 啟動服務器 $server = new Server(); ``` ## 客戶端 創建一個`Client.php`文件并輸入如下內容： ```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, "請輸入消息："); $msg = trim(fgets(STDIN)); $this->client->send( $msg ); $message = $this->client->recv(); echo "Get Message From Server:{$message}\n"; } } $client = new Client(); $client->connect(); ``` ## 運行 在Terminal下執行命令`php Server.php`即可啟動服務器，在另一個Terminal下執行`php Client.php`，輸入要發送的內容，即可發送消息到服務器，并收到來自服務器的消息。