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Use php to develop Websocket to implement real-time map positioning function

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Dec 17, 2023 pm 08:09 PM

phpwebsocketmap

Use php to develop Websocket to implement real-time map positioning function

Title: Using PHP to develop Websocket to implement real-time map positioning function

Introduction:
Websocket is a protocol that implements persistent connections and real-time two-way communication, which can achieve Real-time data transfer and updates. This article will use PHP to develop Websocket, combined with the map positioning function, to achieve real-time map positioning function. The specific code implementation process will be introduced in detail below.

1. Preparation

Install PHP environment (version requirement: PHP 5.3.0)
Install Composer (PHP third-party library management tool)

2. Install related libraries

Open the command line, enter the directory where the project is located, and execute the following command to install the Ratchet library:
```
composer require cboden/ratchet
```
Install Once completed, copy the generated vendor directory to the project root directory.

3. Implement WebSocket server

Create a server.php file and add the following code:

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

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

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

 public function onMessage(ConnectionInterface $from, $msg) {
     foreach ($this->clients as $client) {
         $client->send($msg);
     }
 }

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

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

$server->run();

4. Implement the front-end page

Create an index.html file and add the following code:

<!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title>实时地图定位</title>
 <style>
     #map {
         width: 800px;
         height: 600px;
         border: 1px solid #ccc;
     }
 </style>
 <script src="https://cdn.leafletjs.com/leaflet/v1.3.1/leaflet.js"></script>
 <link rel="stylesheet" href="https://cdn.leafletjs.com/leaflet/v1.3.1/leaflet.css" />
</head>
<body>
 <div id="map"></div>

 <script>
     var map = L.map('map').setView([39.9075, 116.39723], 13);
     L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
         maxZoom: 18,
         attribution: 'Map data &copy; OpenStreetMap contributors'
     }).addTo(map);

     var ws = new WebSocket("ws://localhost:8080");

     ws.onmessage = function (event) {
         var data = JSON.parse(event.data);
         var marker;

         if (data.action === 'add') {
             marker = L.marker([data.lat, data.lng]).addTo(map);
         } else if (data.action === 'update') {
             marker = markers[data.id];
             if (marker) {
                 marker.setLatLng([data.lat, data.lng]);
             }
         } else if (data.action === 'remove') {
             marker = markers[data.id];
             if (marker) {
                 map.removeLayer(marker);
             }
         }

         if (marker) {
             markers[data.id] = marker;
         }
     };

     var markers = {};
 </script>
</body>
</html>

5. Test and run

Open the terminal, enter the directory where the project is located, and execute the following command:
```
php server.php
```
Open the index.html file in the browser, and you will see a map interface.
You can simulate different data updates by modifying the sending data in the onMessage method in server.php.

Summary:
This article introduces how to use PHP to develop Websocket and combine it with the map positioning function to achieve real-time map positioning function. By writing code for server-side and front-end pages, we can update marker location information on the map in real time via Websocket. In actual projects, more functions and data interactions can be added according to needs.

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