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How to Send Realtime Notifications if User Follow using PHP & Mysql
Hello there, in this tutorial we will learn how to send real-time notifications to a user when someone follows them, you can use a combination of PHP and MySQL along with a WebSocket connection. Here are the steps:
1. Create a database table to store the followers information. The table should have at least three columns: id, follower_id, and user_id. The id column should be an auto-increment primary key, follower_id column should store the id of the user who is following, and user_id column should store the id of the user who is being followed.
2. Create a PHP script that inserts a new row into the followers table whenever a user follows another user. This script should take the follower_id and user_id as parameters and insert them into the followers table.
3. Create a WebSocket server that listens for new follower events. Whenever a new follower event occurs, the server should broadcast a notification to the user who is being followed. You can use a library like Ratchet to create a WebSocket server in PHP.
4. Modify the PHP script that inserts a new row into the followers table to also send a new follower event to the WebSocket server. This can be done using a library like Guzzle to make an HTTP request to the WebSocket server.
5. Create a JavaScript client that listens for new follower notifications and displays them to the user. This can be done using a library like Socket.IO to create a WebSocket connection between the client and the server.
Here's an example PHP code that inserts a new follower into the database and sends a notification to the WebSocket server:
<?php
// Connect to the database
$db = new mysqli('localhost', 'username', 'password', 'database');
// Get the follower_id and user_id from the POST request
$follower_id = $_POST['follower_id'];
$user_id = $_POST['user_id'];
// Insert a new row into the followers table
$stmt = $db->prepare("INSERT INTO followers (follower_id, user_id) VALUES (?, ?)");
$stmt->bind_param('ii', $follower_id, $user_id);
$stmt->execute();
// Send a notification to the WebSocket server
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'http://localhost:8000/new-follower');
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode([
'user_id' => $user_id,
]));
curl_exec($ch);
curl_close($ch);
?>
And here's an example WebSocket server code that broadcasts a new follower notification to all connected clients:
<?php
use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;
class FollowerServer implements MessageComponentInterface {
protected $clients;
public function __construct() {
$this->clients = new \SplObjectStorage;
}
public function onOpen(ConnectionInterface $conn) {
$this->clients->attach($conn);
}
public function onClose(ConnectionInterface $conn) {
$this->clients->detach($conn);
}
public function onMessage(ConnectionInterface $from, $msg) {
foreach ($this->clients as $client) {
if ($client !== $from) {
$client->send($msg);
}
}
}
public function onError(ConnectionInterface $conn, \Exception $e) {
$conn->close();
}
}
$server = new \Ratchet\App('localhost', 8000);
$server->route('/new-follower', new class implements MessageComponentInterface {
protected $clients;
public function __construct() {
$this->clients = new \SplObjectStorage;
}
public function onOpen(ConnectionInterface $conn) {
$this->clients->attach($conn);
}
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