Backend DevelopmentPHP TutorialUsing PHP to realize geographical location sharing and display of real-time chat functionUsing PHP to realize geographical location sharing and display of real-time chat function
Use PHP to realize location sharing and display of real-time chat function
With the rapid development of the Internet, instant messaging has become an indispensable tool in people's daily lives. With the popularity of mobile devices and the advancement of positioning technology, location sharing has also become a popular feature. This article will introduce how to use PHP language to implement a real-time chat function and share and display geographical location.
1. Implementation of real-time chat function
In order to realize the real-time chat function, we can use WebSocket technology. WebSocket is a communication protocol that provides full-duplex, two-way communication over a single connection. It can establish a connection for real-time communication between the browser and the server.
First, we need to create a WebSocket server. In PHP, you can use the Ratchet library to create a WebSocket server. You can use Composer to install the Ratchet library:
composer require cboden/ratchet
Then, you can create a chat-server.php file and write the following code in it:
<?php
require 'vendor/autoload.php';
use RatchetMessageComponentInterface;
use RatchetConnectionInterface;
use RatchetServerIoServer;
use RatchetHttpHttpServer;
use RatchetWebSocketWsServer;
class Chat implements MessageComponentInterface {
protected $connections;
public function __construct() {
$this->connections = new SplObjectStorage;
}
public function onOpen(ConnectionInterface $conn) {
$this->connections->attach($conn);
echo "New connection! ({$conn->resourceId})
";
}
public function onMessage(ConnectionInterface $from, $msg) {
foreach ($this->connections as $connection) {
if ($from !== $connection) {
$connection->send($msg);
}
}
}
public function onClose(ConnectionInterface $conn) {
$this->connections->detach($conn);
echo "Connection {$conn->resourceId} has disconnected
";
}
public function onError(ConnectionInterface $conn, Exception $e) {
echo "An error has occurred: {$e->getMessage()}
";
$conn->close();
}
}
$server = IoServer::factory(
new HttpServer(
new WsServer(
new Chat()
)
),
8080
);
$server->run();In the above code, we use the Ratchet library to create Create a class named Chat and implement the MessageComponentInterface interface. In the onOpen() method, we record the information of each connection; in the onMessage() method, we send the received message to other connections; in the onClose() method, we delete the disconnected connection Information; in the onError() method, we handle the error situation.
Then, we can run the chat-server.php file in the terminal to start the WebSocket server:
php chat-server.php
Next, we can use JavaScript to write a client page to connect to the WebSocket server and send information. Create a chat-client.html file and write the following code in it:
<!DOCTYPE html>
<html>
<head>
<title>Chat Client</title>
<script>
var conn = new WebSocket('ws://localhost:8080');
conn.onopen = function(e) {
console.log("Connection established!");
};
conn.onmessage = function(e) {
console.log("Received: " + e.data);
};
function sendMessage() {
var message = document.getElementById('message').value;
conn.send(message);
}
</script>
</head>
<body>
<input type="text" id="message" placeholder="Enter message">
<button onclick="sendMessage()">Send</button>
</body>
</html>In the above code, we create a WebSocket object, and then use the onopen and onmessage events to handle the connection establishment and reception of messages. . We also created a sendMessage() function to send messages.
Open the chat-client.html file, we can connect to the WebSocket server in the browser and send messages.
2. Implementation of geographical location sharing and display
To realize geographical location sharing and display, we can use the HTML5 Geolocation API to obtain the geographical location information of the device. First, add the following code to the chat-client.html file:
navigator.geolocation.getCurrentPosition(function(position) {
var latitude = position.coords.latitude;
var longitude = position.coords.longitude;
var location = "Latitude: " + latitude + ", Longitude: " + longitude;
conn.send(location);
});In the above code, we obtain the device's geographical location information by calling the getCurrentPosition() method and send it to the server.
In the server-side Chat class, we can modify the onMessage() method to receive and broadcast geographical location information:
public function onMessage(ConnectionInterface $from, $msg) {
$data = json_decode($msg, true);
if (isset($data['latitude']) && isset($data['longitude'])) {
foreach ($this->connections as $connection) {
if ($from !== $connection) {
$connection->send($msg);
}
}
} else {
foreach ($this->connections as $connection) {
if ($from !== $connection) {
$connection->send($msg);
}
}
}
}In the above code, we use the json_decode() function to receive The message is converted into an associative array. If the received message contains the latitude and longitude fields, indicating that this is geographical location information, it will be broadcast to other connections; otherwise, the message will be broadcast to other connections.
In the chat-client.html file, we can modify the handler function of the onmessage event to parse the received geographical location information and display it on the page:
conn.onmessage = function(e) {
var data = JSON.parse(e.data);
if (data.latitude && data.longitude) {
var latitude = data.latitude;
var longitude = data.longitude;
// 在地图上展示地理位置
var map = new google.maps.Map(document.getElementById('map'), {
center: {lat: latitude, lng: longitude},
zoom: 12
});
var marker = new google.maps.Marker({
position: {lat: latitude, lng: longitude},
map: map
});
} else {
console.log("Received: " + e.data);
}
};In the above code, we Use the JSON.parse() function to parse the received message into a JavaScript object. If the message contains latitude and longitude fields, we create a Google Maps map and display the geographic location on the map.
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