Creating a TCP Server with Swoole in PHP

Swoole\Server is a PHP extension for creating high‑performance TCP servers that support both TCP and Unix socket connections.

The article provides a complete example in a file tcp_server.php, showing how to instantiate the server, register event callbacks for onConnect, onReceive, and onClose, and start listening on 127.0.0.1:9506.

In the onConnect callback the server acknowledges a new client; the onReceive callback echoes back the received data prefixed with “Server: ”; the onClose callback logs when a client disconnects.

After running the script, you can verify the listening port with netstat and test the server using telnet or netcat, sending a “hello” message and receiving the echoed response.

The guide also notes that the server can handle thousands of simultaneous connections, each identified by a unique file descriptor ($fd).

Full example code:

<?php
// 创建 Server 对象，监听 127.0.0.1:9506 端口
$serv = new Swoole\Server("127.0.0.1", 9506);

// 监听连接进入事件
$serv->on('Connect', function ($serv, $fd) {
    echo "Client: Connect.
";
});

// 监听数据接收事件
$serv->on('Receive', function ($serv, $fd, $from_id, $data) {
    $serv->send($fd, "Server: " . $data);
});

// 监听连接关闭事件
$serv->on('Close', function ($serv, $fd) {
    echo "Client: Close.
";
});

// 启动服务器
$serv->start();
?>