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Use php to develop Websocket to create real-time ticket booking function

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Release： 2023-12-02 10:26:01

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Use php to develop Websocket to create real-time ticket booking function

Title: Use PHP to develop WebSocket to create real-time ticket booking function

Abstract:
This article will use PHP language to develop WebSocket technology to add to the ticket booking website Real-time functionality. This function will enable real-time ticket information updates and instant notifications to users, allowing users to obtain the latest ticket information and make timely reservations.

Introduction:
Air ticket booking is one of the most important functions on a travel website. Users need to obtain the latest air ticket information, choose the appropriate flight and make a reservation. However, the traditional web page refreshing method cannot provide real-time ticket information. Users can only obtain the latest data by constantly refreshing the page, which is inefficient. In order to solve this problem, we will use WebSocket technology to implement real-time ticket booking function.

1. Introduction to WebSocket
WebSocket is a protocol for full-duplex communication on a single TCP connection. It provides real-time, two-way communication functions. Compared with HTTP protocol, WebSocket can reduce network delay and bandwidth consumption, and improve user experience. As a familiar and easy-to-learn programming language, PHP is ideal for developing WebSocket applications.

2. Preparation
Before using PHP to develop WebSocket applications, we need to ensure that the server supports the WebSocket protocol. At the same time, you need to install PHP's WebSocket extension library, which can be installed using Composer.

Specific code examples:
The code of the WebSocket server is as follows:

<?php
require 'vendor/autoload.php';

use RatchetMessageComponentInterface;
use RatchetConnectionInterface;
use RatchetServerIoServer;
use RatchetHttpHttpServer;
use RatchetWebSocketWsServer;

class TicketBooking implements MessageComponentInterface
{
    protected $clients;

    public function __construct()
    {
        $this->clients = new SplObjectStorage;
    }

    public function onOpen(ConnectionInterface $conn)
    {
        $this->clients->attach($conn);
        echo "New connection! ({$conn->resourceId})
";
    }

    public function onMessage(ConnectionInterface $from, $msg)
    {
        // 处理客户端发来的消息
        echo "Received message: {$msg}
";
        
        // 广播消息给所有客户端
        foreach ($this->clients as $client) {
            $client->send($msg);
        }
    }

    public function onClose(ConnectionInterface $conn)
    {
        $this->clients->detach($conn);
        echo "Connection closed! ({$conn->resourceId})
";
    }

    public function onError(ConnectionInterface $conn, Exception $e)
    {
        echo "An error occurred: {$e->getMessage()}
";
        $conn->close();
    }
}

$server = IoServer::factory(
    new HttpServer(
        new WsServer(
            new TicketBooking()
        )
    ),
    8080
);

$server->run();
?>

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In the above code, we use the Ratchet library to implement the functions of the WebSocket server. The TicketBooking class is a class defined by ourselves and inherits Ratchet's MessageComponentInterface interface. In the onOpen, onMessage, onClose and onError methods, we handle the client connection, receiving messages, closing the connection and error handling respectively.

3. Client code
The following is a code example of an HTML page, which is used to simulate users visiting the ticket booking page.

<!DOCTYPE html>
<html>
<head>
    <title>Ticket Booking</title>
</head>
<body>
    <h1>Ticket Booking</h1>
    
    <!-- WebSocket客户端代码 -->
    <script>
    var socket = new WebSocket("ws://localhost:8080");

    socket.onopen = function(event) {
        console.log("WebSocket connected");
    };

    socket.onmessage = function(event) {
        console.log("Received message: " + event.data);
        // 处理接收到的消息，更新机票信息等操作
    };

    socket.onclose = function(event) {
        console.log("WebSocket closed");
    };
    </script>
</body>
</html>

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In the above code, we use JavaScript's WebSocket object to connect to the WebSocket server. Through the event callback functions of onopen, onmessage and onclose, we can handle operations such as connection establishment, message reception and connection closing. You can process received messages in the onmessage callback function according to actual needs, such as updating ticket information or reminding users that new tickets are available for booking.

Conclusion:
By using PHP to develop WebSocket, we can add real-time functions to the air ticket booking website, so that users can get the latest air ticket information and make timely reservations. This article provides a simple code example, hoping to help readers understand how to use PHP to develop WebSocket applications. Of course, this is just a basic example, and you can further improve the function according to your actual needs.

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