Workerman development: How to implement instant messaging based on WebSocket protocol

Workerman Development: How to implement instant messaging based on WebSocket protocol

Introduction:
With the rapid development of the Internet, instant messaging has become an important way for people to communicate in daily life . As a full-duplex communication protocol, the WebSocket protocol can realize real-time two-way data transmission, so it is widely used in the field of instant messaging. This article will introduce how to use the PHP framework Workerman to develop an instant messaging application based on the WebSocket protocol, and provide specific code examples.

1. Preparation work:
Before starting development, we need to do some preparation work.

1. Install Workerman:
   Workerman is a high-performance asynchronous socket server framework developed in PHP, which can easily develop WebSocket communication. We can use Composer to install:

composer require workerman/workerman

2. Create the project:
   Create a new project folder on the web server of your choice and create a new PHP in it File, such as index.php.
3. Introduce Workerman:
   Add the following code to the index.php file and introduce Workerman’s automatic loading file:

<?php
require_once __DIR__ . '/vendor/autoload.php';

2. Basic implementation Function:
Next we start to implement instant messaging based on WebSocket protocol.

1. Create Worker object:
   In the index.php file, add the following code to create a WebSocket server instance:

$ws_worker = new WorkermanWorker('websocket://0.0.0.0:8000');

2. Listen to connection events:
   Add the following code to listen to connection events. When there is a new WebSocket connection, the callback function will be automatically triggered:

$ws_worker->onConnect = function ($connection) {
    echo "New connection
";
};

3. Listen to message events:
   Add The following code listens for message events. When a WebSocket client sends a message, the callback function will be automatically triggered:

$ws_worker->onMessage = function ($connection, $data) {
    echo "Received message: $data
";
};

4. Listen for closing events:
   Add the following code to listen for closing events. When there is When the WebSocket connection is closed, the callback function will be automatically triggered:

$ws_worker->onClose = function ($connection) {
    echo "Connection closed
";
};

5. Start the server:
   Add the following code to start the server and start listening for client connections and messages:

WorkermanWorker::runAll();

3. Complete sample code:
The following is a complete sample code that shows how to use Workerman to implement instant messaging based on the WebSocket protocol:

<?php
require_once __DIR__ . '/vendor/autoload.php';

$ws_worker = new WorkermanWorker('websocket://0.0.0.0:8000');
$ws_worker->onConnect = function ($connection) {
    echo "New connection
";
};
$ws_worker->onMessage = function ($connection, $data) {
    echo "Received message: $data
";
    $connection->send('Hello, ' . $data . '!');
};
$ws_worker->onClose = function ($connection) {
    echo "Connection closed
";
};

WorkermanWorker::runAll();

4. Run the test:
Save and After launching the index.php file, open the WebSocket client in the browser and connect to ws://localhost:8000. Then enter the message on the client side and send it. You can see the printed message on the server side and return the corresponding reply.

Summary:
This article introduces how to use the Workerman framework to develop an instant messaging application based on the WebSocket protocol. By creating Worker objects, listening for connections, messages and closing events, we can implement a simple two-way communication WebSocket server. Through the above code examples, you can further expand and optimize your application to meet more complex instant messaging needs.

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