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Build a Real-Time PHP Chat App with MySQL & JavaScript

20 Feb, 2026 97 mins read
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Build a Real-Time PHP Chat App with MySQL & JavaScript

Learn how to create a real-time PHP chat app using MySQL and JavaScript with user login, typing status, chat history deletion, and a modern, responsive UI.

In this tutorial, you’ll learn how to build a real-time chat application using PHP, MySQL, and JavaScript from scratch. We’ll create a modern, user-friendly chat system featuring secure authentication, live typing indicators, message history management, and a clean, responsive UI. Using AJAX for real-time updates and TailwindCSS-style design, this project is perfect for anyone who wants to level up their PHP skills and build practical, production-ready applications.  

Table of contents [Show]

Tech Stack:

Features: Landing Page, Registration/Login, Typing Indicator, Delete + History, Prettier UI

  • Frontend: HTML, CSS (TailwindCSS/Prettier-style), JavaScript (AJAX)
  • Backend: PHP (Procedural or OOP)
  • Database: MySQL

Project Structure

chat-app/
│
├── chat.php  
├── check_typing_status.php                      
├── config.php           
├── db.sql           
├── delete_message.php              
├── fetch_messages.php
├── index.php
├── login.php            
├── logout.php
├── register.php            
├── send_message.php
├── style.css
└── typing_status.php

1. Landing Page (index.php)

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Chat App - Connect Instantly</title>
   <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css">
  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap" rel="stylesheet">
  <style>
    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: 'Inter', sans-serif;
      background: #f4f7fb;
      color: #2c3e50;
      line-height: 1.6;
    }
    header {
      background: #ffffff;
      padding: 20px 40px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    header h1 {
      font-size: 24px;
      color: #3498db;
    }
    nav a {
      margin-left: 20px;
      text-decoration: none;
      color: #2c3e50;
      font-weight: 500;
    }
    .hero {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      padding: 100px 20px;
      text-align: center;
      background: linear-gradient(135deg, #3498db 20%, #9b59b6 100%);
      color: white;
    }
    .hero h2 {
      font-size: 42px;
      max-width: 600px;
      margin-bottom: 20px;
    }
    .hero p {
      font-size: 18px;
      max-width: 500px;
      margin-bottom: 30px;
    }
    .hero .cta {
      display: flex;
      gap: 15px;
    }
    .hero .cta a {
      padding: 12px 24px;
      background: white;
      color: #3498db;
      font-weight: 600;
      text-decoration: none;
      border-radius: 6px;
      transition: 0.3s;
    }
    .hero .cta a:hover {
      background: #ecf0f1;
    }
    .preview {
      padding: 60px 20px;
      text-align: center;
    }
    .preview h3 {
      font-size: 28px;
      margin-bottom: 20px;
    }
    .chat-ui-sample {
      max-width: 600px;
      margin: 0 auto;
      background: white;
      border-radius: 10px;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
      padding: 20px;
      text-align: left;
    }
    .message {
      margin-bottom: 15px;
    }
    .message .sender {
      font-weight: 600;
      color: #3498db;
    }
    .footer {
      text-align: center;
      padding: 20px;
      color: #95a5a6;
      font-size: 14px;
    }
  </style>
</head>
<body>
  <header>
    <h1>Chat App</h1>
   <!-- <nav>
      <a href="#">Login</a>
      <a href="#">Sign Up</a>
      <a href="#">Docs</a>
    </nav> -->
  </header>
  <section class="hero">
    <h2>Fast, Secure, and Fun Messaging</h2>
    <p>Chatter lets you connect instantly with friends and colleagues through real-time messaging, voice, and media sharing.</p>
    <div class="cta">
      <a href="register.php">Register</a>
      <a href="login.php">Login</a>
    </div>
  </section>
  <section class="preview">
    <h3>See How It Works</h3>
    <div class="chat-ui-sample">
      <div class="message">
        <div class="sender">Alice</div>
        <div class="text">Hey Bob, are we meeting at 3 PM?</div>
      </div>
      <div class="message">
        <div class="sender">Bob</div>
        <div class="text">Yes! Don’t forget the slides 😄</div>
      </div>
    </div>
  </section>
  <footer class="footer">
    &copy; 2025 Chat App. All rights reserved.
  </footer>
</body>
</html>

2. User Registration (register.php)

<?php
require 'config.php';
// Initialize error message
$error = '';
// CSRF Token Generation
if (empty($_SESSION['csrf_token'])) {
    $_SESSION['csrf_token'] = bin2hex(random_bytes(32));
}
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // CSRF Token Validation
    if (!isset($_POST['csrf_token']) || $_POST['csrf_token'] !== $_SESSION['csrf_token']) {
        $error = "Invalid CSRF token.";
    } else {
        $username = trim($_POST['username']);
        $password = $_POST['password'];
        // Validate username (3-20 characters, alphanumeric + underscore)
        if (!preg_match('/^[a-zA-Z0-9_]{3,20}$/', $username)) {
            $error = "Username must be 3-20 characters and contain only letters, numbers, and underscores.";
        }
        // Validate password length
        elseif (strlen($password) < 6) {
            $error = "Password must be at least 6 characters long.";
        }
        else {
            $hashedPassword = password_hash($password, PASSWORD_DEFAULT);
            $stmt = $conn->prepare("INSERT INTO users (username, password) VALUES (?, ?)");
            $stmt->bind_param("ss", $username, $hashedPassword);
            if ($stmt->execute()) {
                header("Location: login.php");
                exit();
            } else {
                $error = "Username already taken or database error.";
            }
        }
    }
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Register</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      background-color: #f2f2f2;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
    }
    .login-container {
      background-color: white;
      padding: 20px 30px;
      border-radius: 8px;
      box-shadow: 0 0 10px rgba(0,0,0,0.1);
      width: 300px;
    }
    .login-container h2 {
      text-align: center;
      margin-bottom: 20px;
    }
    .form-group {
      margin-bottom: 15px;
    }
    .form-group label {
      display: block;
      margin-bottom: 5px;
    }
    .form-group input {
      width: 100%;
      padding: 8px;
      box-sizing: border-box;
    }
    .login-button {
      width: 100%;
      padding: 10px;
      background-color: #4CAF50;
      color: white;
      border: none;
      border-radius: 4px;
      cursor: pointer;
    }
    .login-button:hover {
      background-color: #45a049;
    }
    .text-danger {
      color: red;
      font-size: 0.9em;
      text-align: center;
    }
    .text-link {
      text-align: center;
      margin-top: 10px;
      font-size: 0.9em;
    }
  </style>
</head>
<body>
  <div class="login-container">
    <h2>Register</h2>
    <form method="post">
      <input type="hidden" name="csrf_token" value="<?php echo htmlspecialchars($_SESSION['csrf_token']); ?>">
      <div class="form-group">
        <label for="username">Username</label>
        <input type="text" id="username" name="username" placeholder="Username" required>
      </div>
      <div class="form-group">
        <label for="password">Password</label>
        <input type="password" id="password" name="password" required>
      </div>
      <button type="submit" class="login-button">Register</button>
      <p class="text-danger"><?php echo htmlspecialchars($error); ?></p>
    </form>
    <p class="text-link">Already have an account? <a href="login.php">Login Here</a>.</p>
  </div>
</body>
</html>


<?php
require 'config.php';
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    $stmt = $conn->prepare("SELECT id, password FROM users WHERE username = ?");
    $stmt->bind_param("s", $username);
    $stmt->execute();
    $stmt->store_result();
    
    $stmt->bind_result($user_id, $hashed_password);
    if ($stmt->num_rows > 0 && $stmt->fetch() && password_verify($password, $hashed_password)) {
        $_SESSION['user_id'] = $user_id;
        $_SESSION['username'] = $username;
        header("Location: chat.php");
    } else {
        $error = "Invalid login";
    }
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Login Form</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      background-color: #f2f2f2;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
    }
    .login-container {
      background-color: white;
      padding: 20px 30px;
      border-radius: 8px;
      box-shadow: 0 0 10px rgba(0,0,0,0.1);
      width: 300px;
    }
    .login-container h2 {
      text-align: center;
      margin-bottom: 20px;
    }
    .form-group {
      margin-bottom: 15px;
    }
    .form-group label {
      display: block;
      margin-bottom: 5px;
    }
    .form-group input {
      width: 100%;
      padding: 8px;
      box-sizing: border-box;
    }
    .login-button {
      width: 100%;
      padding: 10px;
      background-color: #4CAF50;
      color: white;
      border: none;
      border-radius: 4px;
      cursor: pointer;
    }
    .login-button:hover {
      background-color: #45a049;
    }
  </style>
</head>
<body>
  <div class="login-container">
    <h2>Login</h2>
    <form method="post">
      <div class="form-group">
        <label for="username">Username</label>
        <input type="text" id="username" name="username" placeholder="Username" required>
      </div>
      <div class="form-group">
        <label for="password">Password</label>
        <input type="password" id="password" name="password" required>
      </div>
      <button type="submit" class="login-button">Login</button>
		<p class="text-danger"><?php echo $error ?? ''; ?></p>
    </form>
	 <p>Don't have an account? <a href="register.php">Register here</a>.</p>
  </div>
</body>
</html>

4. Chat Interface (chat.php)

<?php
require 'config.php';
if (!isset($_SESSION['user_id'])) {
    header("Location: index.php");
    exit();
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Messaging Template with Usernames</title>
   <link rel="stylesheet" href="style.css">
   <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css">
    <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
  <style>
    body {
      font-family: Arial, sans-serif;
      background: #f1f1f1;
      margin: 0;
      padding: 0;
    }
    .chat-container {
      max-width: 600px;
      margin: 50px auto;
      background: #fff;
      border-radius: 10px;
      box-shadow: 0 0 10px rgba(0,0,0,0.1);
      padding: 20px;
    }
  </style>
</head>
<body>
	<div class="chat-container">
		<h3>Welcome, <?php echo $_SESSION['username']; ?>!</h3>
        <a href="logout.php" class="btn btn-danger">Logout</a>
		<div id="chat-box" class="border p-3 mb-3" style="height: 400px; overflow-y: scroll;"></div>
    <form id="chat-form">
        <input type="text" id="message" class="form-control mb-2" placeholder="Enter message" required>
        <button class="btn btn-success">Send</button>
    </form>
	</div>
</body>
</html>
<script>
$(document).ready(function () {
    let typingTimer;
    let isTyping = false;
    function setTypingStatus(status) {
        if (isTyping !== status) {
            isTyping = status;
            $.post("typing_status.php", { typing: status ? 1 : "" });
        }
    }
    function loadMessages() {
        $.get("fetch_messages.php", function (data) {
            $('#chat-box').html(data);
            // Auto-scroll removed
        });
    }
    // Initial load and polling
    loadMessages();
    setInterval(loadMessages, 1000);
    // Handle message sending
    $('#chat-form').on('submit', function (e) {
        e.preventDefault();
        setTypingStatus(false);
        $.post("send_message.php", { message: $('#message').val() }, function () {
            $('#message').val('');
            loadMessages();
        });
    });
    // Handle typing indicator
    $('#message').on('input', function () {
        setTypingStatus(true);
        clearTimeout(typingTimer);
        typingTimer = setTimeout(() => {
            setTypingStatus(false);
        }, 3000);
    });
    // Handle message deletion
    $(document).on('click', '.delete-btn', function () {
        if (confirm('Are you sure you want to delete this message?')) {
            const messageId = $(this).data('id');
            $.post('delete_message.php', { message_id: messageId }, function () {
                loadMessages();
            });
        }
    });
});
</script>

5. Logout (logout.php)

<?php
session_start();
session_destroy();
header("Location: index.php");
exit();
?>

6. PHP Backend Script (send_message.php)

<?php
require 'config.php';
if (isset($_SESSION['user_id']) && isset($_POST['message'])) {
    $msg = htmlspecialchars(trim($_POST['message']));
    $stmt = $conn->prepare("INSERT INTO messages (user_id, message) VALUES (?, ?)");
    $stmt->bind_param("is", $_SESSION['user_id'], $msg);
    $stmt->execute();
}
?>

7. PHP Backend Script (fetch_message.php)

<?php
require 'config.php';
echo '<style>
    /* General Styles */
    body {
        font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
        background-color: #f1f1f1;
        color: #333;
        padding: 20px;
    }
    /* Message container styling */
    .message-container {
        font-family: Arial, sans-serif;
        margin-bottom: 20px;
        padding: 15px;
        border-radius: 12px;
        box-shadow: 0 3px 8px rgba(0, 0, 0, 0.1);
        background-color: #ffffff;
        transition: all 0.3s ease;
    }
    .message-container:hover {
        transform: translateY(-5px);
        box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
    }
    .message-author {
        font-weight: bold;
        color: #4a90e2;
        font-size: 16px;
    }
    .message-body {
        margin-top: 8px;
        font-size: 15px;
        color: #555;
    }
    .message-body.deleted {
        font-style: italic;
        color: #999;
    }
    .message-time {
        font-size: 12px;
        color: #777;
        margin-top: 5px;
    }
    /* Styling for message delete button */
    .btn-danger {
        background-color: #ff4757;
        border: none;
        color: white;
        padding: 6px 12px;
        border-radius: 5px;
        cursor: pointer;
        font-size: 12px;
        margin-top: 5px;
        transition: background-color 0.3s ease;
    }
    .btn-danger:hover {
        background-color: #e84118;
    }
    .btn-danger:focus {
        outline: none;
    }
    /* Align message based on user */
    .message-container.mine {
        background-color: #e0f7fa;
        align-self: flex-end;
    }
    .message-container.mine .message-author {
        color: #00bcd4;
    }
    .message-container.mine .message-time {
        color: #00bcd4;
    }
    /* Typing indicator */
    .typing-indicator {
        font-style: italic;
        color: #aaa;
        margin-top: 10px;
        font-size: 14px;
    }
    /* Styling for the chat container */
    .chat-container {
        display: flex;
        flex-direction: column;
        max-width: 600px;
        margin: 0 auto;
    }
    /* Mobile responsiveness */
    @media (max-width: 600px) {
        .message-container {
            padding: 12px;
        }
        .message-author {
            font-size: 14px;
        }
        .message-body {
            font-size: 13px;
        }
        .typing-indicator {
            font-size: 13px;
        }
    }
</style>';
echo '<div class="chat-container">';
$query = "SELECT m.id, m.message, m.deleted, m.created_at, m.user_id, u.username 
          FROM messages m 
          JOIN users u ON m.user_id = u.id 
          ORDER BY m.created_at ASC";
$result = $conn->query($query);
while ($row = $result->fetch_assoc()) {
    $isMine = $row['user_id'] == $_SESSION['user_id'];
    
    // Add 'mine' class for self-messages to align them to the right
    $messageClass = $isMine ? 'mine' : '';
    echo "<div class='message-container $messageClass'>";
    echo "<p class='message-author'>" . htmlspecialchars($row['username']) . ":</p>";
    if ($row['deleted']) {
        echo "<p class='message-body deleted'>Message deleted</p>";
    } else {
        echo "<p class='message-body'>" . htmlspecialchars($row['message']) . "</p>";
    }
    echo "<p class='message-time'>(" . htmlspecialchars($row['created_at']) . ")</p>";
    // Show delete button if the message belongs to the current user and is not deleted
    if ($isMine && !$row['deleted']) {
        echo "<form method='POST' action='delete_message.php' style='display:inline'>
                <input type='hidden' name='message_id' value='{$row['id']}'>
                <button type='submit' class='btn-danger' onclick=\"return confirm('Delete this message?');\">Delete</button>
               </form>";
    }
    echo "</div>";
}
// Typing indicator
$typing_query = "SELECT username FROM users WHERE is_typing = 1 AND id != {$_SESSION['user_id']}";
$typing_result = $conn->query($typing_query);
if ($typing_result->num_rows > 0) {
    $typing_users = [];
    while ($row = $typing_result->fetch_assoc()) {
        $typing_users[] = $row['username'];
    }
    echo "<p class='typing-indicator'>" . implode(', ', $typing_users) . " is typing...</p>";
}
echo '</div>';
?>

8. PHP Backend Script (delete_message.php)

<?php
require 'config.php';
session_start();
if (!isset($_SESSION['user_id'])) {
    exit('Unauthorized');
}
$userId = (int)$_SESSION['user_id'];
if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['message_id'])) {
    $messageId = (int)$_POST['message_id'];
    // Verify that the message belongs to the user
    $check = $conn->prepare("SELECT id FROM messages WHERE id = ? AND user_id = ?");
    $check->bind_param("ii", $messageId, $userId);
    $check->execute();
    $result = $check->get_result();
    if ($result && $result->num_rows > 0) {
        // Soft delete (mark as deleted)
        $delete = $conn->prepare("UPDATE messages SET deleted = 1 WHERE id = ?");
        $delete->bind_param("i", $messageId);
        $delete->execute();
    }
}
header("Location: chat.php"); // Replace with your actual chat page
exit;

9. PHP Backend Script (check_typing_status.php)

<?php
require 'db.php';
$response = ['typing' => false];
if (isset($_SESSION['user_id']) && isset($_SESSION['typing_status']) && $_SESSION['typing_status']) {
    $response['typing'] = true;
}
echo json_encode($response);
?>

10. PHP Backend Script (typing_status.php)

<?php
require 'config.php';
if (isset($_SESSION['user_id'])) {
    $user_id = $_SESSION['user_id'];
    $is_typing = isset($_POST['typing']) && $_POST['typing'] == 1 ? 1 : 0;
	$stmt = $conn->prepare("UPDATE users SET is_typing = ?, last_typed_at = NOW() WHERE id = ?");
    $stmt = $conn->prepare("UPDATE users SET is_typing = ? WHERE id = ?");
    $stmt->bind_param("ii", $is_typing, $user_id);
    $stmt->execute();
}
?>

11. Database Schema


CREATE TABLE `messages` (
  `id` int(11) NOT NULL,
  `user_id` int(11) NOT NULL,
  `message` text NOT NULL,
  `created_at` timestamp NOT NULL DEFAULT current_timestamp(),
  `deleted` tinyint(1) DEFAULT 0
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
CREATE TABLE `users` (
  `id` int(11) NOT NULL,
  `username` varchar(50) NOT NULL,
  `password` varchar(255) NOT NULL,
  `is_typing` tinyint(1) DEFAULT 0,
  `last_typed_at` timestamp NULL DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
ALTER TABLE `messages`
  ADD PRIMARY KEY (`id`),
  ADD KEY `user_id` (`user_id`);
ALTER TABLE `users`
  ADD PRIMARY KEY (`id`),
  ADD UNIQUE KEY `username` (`username`);
ALTER TABLE `messages`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT;
ALTER TABLE `users`
  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT;
ALTER TABLE `messages`
  ADD CONSTRAINT `messages_ibfk_1` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE;
COMMIT;

12. Database Connection (config.php)

<?php
$host = "localhost";
$user = "root";
$pass = "";
$dbname = "chat_app";
$conn = new mysqli($host, $user, $pass, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}
session_start();
?>

13. CSS Styling (style.css)

/* General */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f2f2f2;
    padding: 20px;
    margin: 0;
}
h3 {
    margin-bottom: 20px;
    color: #333;
}
/* Chat container */
#chat-box {
    background: #fff;
    border: 1px solid #ccc;
    border-radius: 10px;
    padding: 15px;
    height: 300px;
    overflow-y: scroll;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
}
/* Chat message style */
#chat-box p {
    background: #e9f0fa;
    border-radius: 8px;
    padding: 10px;
    margin: 10px 0;
    max-width: 75%;
    position: relative;
    clear: both;
}
#chat-box p strong {
    color: #007bff;
    display: block;
    margin-bottom: 5px;
}
#chat-box p:nth-child(even) {
    background: #dfe8f1;
    margin-left: auto;
}
/* Typing indicator */
#typing-indicator {
    font-style: italic;
    color: #777;
    padding: 5px 0;
    margin-top: 10px;
    animation: blink 1s infinite;
}
@keyframes blink {
    0% { opacity: 1; }
    50% { opacity: 0.5; }
    100% { opacity: 1; }
}
/* Form styling */
form {
    margin-top: 15px;
    display: flex;
    flex-direction: row;
    gap: 10px;
}
#message {
    flex: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 20px;
    outline: none;
    font-size: 14px;
    background-color: #fff;
}
button {
    padding: 10px 20px;
    background-color: #007bff;
    border: none;
    color: #fff;
    font-weight: bold;
    border-radius: 20px;
    cursor: pointer;
    transition: background 0.3s ease;
}
button:hover {
    background-color: #0056b3;
}
/* Auth forms */
input[type="text"],
input[type="password"] {
    padding: 10px;
    width: 250px;
    margin-bottom: 10px;
    border: 1px solid #bbb;
    border-radius: 5px;
}
.auth-form {
    background-color: #fff;
    padding: 20px;
    margin: 30px auto;
    max-width: 400px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}
.auth-form h2 {
    text-align: center;
    color: #333;
}
/* style.css */
.message-container {
    font-family: Arial, sans-serif;
    margin-bottom: 15px;
    padding: 10px;
    background-color: #f9f9f9;
    border-radius: 5px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}
.message-container p {
    margin: 0;
}
.message-author {
    font-weight: bold;
    color: #333;
}
.message-body {
    margin-top: 5px;
    font-size: 14px;
    color: #555;
}
.message-body.deleted {
    font-style: italic;
    color: #888;
}
.message-time {
    font-size: 12px;
    color: #999;
}
.btn-danger {
    background-color: #d9534f;
    border: none;
    color: white;
    padding: 5px 10px;
    border-radius: 3px;
    cursor: pointer;
    font-size: 12px;
}
.btn-danger:hover {
    background-color: #c9302c;
}
.typing-indicator {
    font-style: italic;
    color: #aaa;
    margin-top: 10px;
}

App Screeshot

chat-app

 

Conclusion

With just PHP, MySQL, and JavaScript, you’ve successfully built a functional real-time chat application packed with essential features. From live typing indicators to message deletion and chat history management, this project shows how powerful a well-structured PHP backend combined with AJAX and a clean UI.

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