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Multi-device synchronization and message push of PHP real-time chat function
Introduction:
In today's era of social networks and instant messaging, real-time chat function has become One of the basic requirements of many web applications and mobile applications. When developing a real-time chat function, we not only need to implement the function of sending and receiving messages instantly, but also need to consider the issues of multi-device synchronization and message push. This article will introduce how to use PHP to implement real-time chat function and solve the needs of multi-device synchronization and message push.
1. Environment preparation
Before starting development, we need to prepare the following environment:
2. Implementation process
Connect to the database: Use PHP to connect to the database and create a message table to store chat records.
$db = new mysqli('localhost', 'username', 'password', 'database'); $db->query("CREATE TABLE IF NOT EXISTS messages (id INT AUTO_INCREMENT PRIMARY KEY, sender VARCHAR(50), receiver VARCHAR(50), content TEXT, created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP)");
New message processing: Save new messages to the database through POST requests.
if ($_SERVER['REQUEST_METHOD'] == 'POST') { $sender = $_POST['sender']; $receiver = $_POST['receiver']; $content = $_POST['content']; $db->query("INSERT INTO messages (sender, receiver, content) VALUES ('$sender', '$receiver', '$content')"); echo 'Success'; }
Chat record query: Obtain the chat record between two users through GET request.
if ($_SERVER['REQUEST_METHOD'] == 'GET') { $sender = $_GET['sender']; $receiver = $_GET['receiver']; $result = $db->query("SELECT * FROM messages WHERE (sender = '$sender' AND receiver = '$receiver') OR (sender = '$receiver' AND receiver = '$sender')"); $messages = []; while ($row = $result->fetch_assoc()) { $messages[] = $row; } echo json_encode($messages); }
Real-time message push: Use long connections and asynchronous tasks to push new messages to all online users in real time.
$server = new swoole_websocket_server('0.0.0.0', 9501); $server->on('open', function ($server, $request) { echo "New connection: {$request->fd} "; }); $server->on('message', function ($server, $frame) { $message = json_decode($frame->data, true); // 保存到数据库 $sender = $message['sender']; $receiver = $message['receiver']; $content = $message['content']; $db->query("INSERT INTO messages (sender, receiver, content) VALUES ('$sender', '$receiver', '$content')"); // 推送给所有在线用户 $result = $db->query("SELECT fd FROM online_users"); while ($row = $result->fetch_assoc()) { $server->push($row['fd'], $frame->data); } }); $server->on('close', function ($server, $fd) { echo "Connection closed: {$fd} "; }); $server->start();
3. Implementation principle of real-time multi-device synchronization and message push
Conclusion:
It is a common development task for PHP to realize multi-device synchronization and message push of real-time chat function. System performance and user experience can be improved through proper technology selection and asynchronous processing. The above code example gives a simple implementation idea, and developers can improve and expand it according to actual needs. Hope this article is helpful to you.
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