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

					
					

						

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

							
							Dec 17, 2023 pm	 08:09 PM
															

																			php
																			websocket
																			map
																	

														
						

					

					

					

						

						
						
						

					
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


    

  1. Install PHP environment (version requirement: PHP 5.3.0)
    2. 

  2. Install Composer (PHP third-party library management tool)
    3.  


2. Install related libraries


    

  1. 

    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
  2. Install Once completed, copy the generated vendor directory to the project root directory. 
3. Implement WebSocket server
  1. 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
  1. Create an index.html file and add the following code:
    <!DOCTYPE html>
<html>
<head>
 <meta charset="UTF-8">
 <title>實(shí)時(shí)地圖定位</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
  1. Open the terminal, enter the directory where the project is located, and execute the following command: 
    php server.php
    2. 

  2. Open the index.html file in the browser, and you will see a map interface. 
    3. 

  3. You can simulate different data updates by modifying the sending data in the onMessage method in server.php. 
    4. 



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. 
The above is the detailed content of Use php to develop Websocket to implement real-time map positioning function. For more information, please follow other related articles on the PHP Chinese website!



						

					

					

						
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