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How To create Chat Server using - PHP with MYsql db connectivity

//-------------- Chat server BY Kilvish ------------


<?php
// Establish MySQL database connection
$servername = "localhost";
$username = "root";
$password = "";
$dbname = "chatdb";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Retrieve chat messages from the database
function getChatMessages() {
    global $conn;
    $sql = "SELECT * FROM chat_messages ORDER BY created_at ASC";
    $result = $conn->query($sql);
    $messages = array();

    if ($result->num_rows > 0) {    
        while ($row = $result->fetch_assoc()) {
            $messages[] = $row;
        }
    }

    return $messages;
}

// Insert a new chat message into the database
function insertChatMessage($username, $message) {
    global $conn;
    $sql = "INSERT INTO chat_messages (username, message,created_at) VALUES ('$username', '$message','')";
   
    if ($conn->query($sql) === true) {
        return true;
    } else {
        return false;
    }
}

// Handle new chat message submission
if ($_SERVER["REQUEST_METHOD"] == "POST" && isset($_POST['username']) && isset($_POST['message'])) {
    $username = $_POST['username'];
    // $_SESSION[$username]=$uid;
    $message = $_POST['message'];

    if (insertChatMessage($username, $message)) {
        echo "Message sent successfully.";
    } else {
        echo "Error sending message.";
    }
}

// Retrieve chat messages
$chatMessages = getChatMessages();
?>

<!DOCTYPE html>
<html>
<head>
    <title>Chat Server</title>
</head>
<body>
    <h2>Chat Messages</h2>
    <ul>
        <?php foreach ($chatMessages as $message): ?>
            <li><?php echo $message['username'] . ": " . $message['message']; ?></li>
        <?php endforeach; ?>
    </ul>

    <h2>Send Message</h2>
    <form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
        <label for="username">Username:</label>
        <input type="text" name="username" required><br><br>

        <label for="message">Message:</label>
        <input type="text" name="message" required><br><br>

        <input type="submit" value="Send">
    </form>
</body>
</html>

<?php
// Close the database connection
$conn->close();
?>

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