Project 1: PHP Login & Registration System (Introduction)

Introduction

👉 Important:
Before moving to advanced topics like AJAX, jQuery, or Object-Oriented PHP (OOP), it is important to understand how a basic login and registration system works.

What You Will Build

By the end of this project, you will have:

• User registration system
• Secure login authentication
• Password hashing using password_hash()
• Session-based login management
• Logout functionality
• Protected dashboard page

These features together form a basic authentication system used by many modern web applications.

Technologies Used

This project will be built using the following technologies:

• PHP – server-side programming language
• MySQL – database used to store user information
• mysqli (Prepared Statements) – secure database interaction
• HTML – structure of forms and pages
• phpMyAdmin – database management tool

These technologies are commonly used together to create dynamic websites and user management systems.

How Login Systems Work

A typical login and registration system works using the following process:

1. A user fills out the registration form.
2. The system validates the input data.
3. The user’s information is stored securely in the MySQL database.
4. The password is stored using password hashing instead of plain text.
5. When the user logs in, the system checks the email and password.
6. If the credentials are correct, the system creates a PHP session.
7. The user is redirected to a protected dashboard page.
8. When the user logs out, the session is destroyed.

This process allows websites to control access to certain pages and provide secure login functionality.

Project Features (Step-by-Step)

We will build this project step by step in multiple tutorials.

The main parts of the project include:

1. Database design
2. Registration form creation
3. Password hashing implementation
4. Login system development
5. Session-based authentication
6. Logout functionality
7. Basic security improvements

Each part will help you understand how authentication systems work in real applications.

Database Design

To store user accounts, we first need to create a database and a table where user information will be saved.

Step 1: Create Database

Using phpMyAdmin, create a database named:

login_system

Step 2: Create users Table

Run the following SQL query to create the users table.

CREATE TABLE users (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(100),
    email VARCHAR(100) UNIQUE,
    password VARCHAR(255),
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

Explanation

• id → Unique user ID
• name → User’s full name
• email → Used for login and must be unique
• password → Stores encrypted password
• created_at → Stores account creation time

This table will store all registered users of the system.

Project Folder Structure

Create a folder like this:

login-system/
│
├── db.php
├── register.php
├── login.php
├── dashboard.php
├── logout.php

Explanation of files:

• db.php → Database connection file
• register.php → User registration page
• login.php → Login form and authentication
• dashboard.php → Protected user page
• logout.php → Ends user session

Keeping files organized helps maintain and scale the project easily.

Database Connection File (db.php)

<?php
$host = "localhost";
$user = "root";
$pass = "";
$db   = "login_system";

$conn = mysqli_connect($host, $user, $pass, $db);

if (!$conn) {
    die("Database connection failed");
}
?>

This file allows all project pages to connect to the database.

On hosting platforms like InfinityFree, the database credentials will be different and provided in the hosting control panel.

Why We Use Password Hashing

Storing passwords as plain text is very dangerous. If the database is compromised, attackers can easily see user passwords.

Instead of storing plain passwords, we use password hashing.

PHP provides built-in functions for secure password handling.

password_hash()
password_verify()

Example:

$password = password_hash($_POST['password'], PASSWORD_DEFAULT);

Password hashing makes your application much more secure and professional.

We will implement password hashing in detail in the next tutorial.

Important Security Rules (From Day One)

Security is extremely important when building authentication systems.

Follow these rules when building login systems:

• Never store passwords as plain text
• Always use prepared statements for database queries
• Validate and sanitize user input
• Use sessions to manage login state
• Restrict access to protected pages

Learning these practices early will help you build secure web applications.

Prerequisites

Before starting this project, you should understand the following basics:

• Basic PHP syntax
• HTML forms
• Basic MySQL database concepts
• How to run PHP on localhost using XAMPP or WAMP

If you already know these topics, you are ready to start this project.

Project Tutorial Series

This project will be built step by step in the following tutorials:

1. Project Introduction (this tutorial)
2. Creating the Registration Form
3. Implementing Password Hashing
4. Creating the Login System
5. Logout and Session Management
6. Creating a Protected Dashboard Page

By the end of this project series, you will have a complete PHP Login and Registration System.

Practical Task

Before moving to the next tutorial, try the following tasks.

Task 1: Create a new folder named login-system.

Task 2: Create the project files:

• db.php
• register.php
• login.php

Task 3: Create the login_system database using phpMyAdmin.

Task 4: Create the users table using the SQL query provided above.

Completing these tasks will prepare your environment for the next tutorial.

Conclusion

In this tutorial, we introduced the PHP Login and Registration System project and prepared the basic structure required to build the system. We discussed the technologies used, the database design, and the folder structure for the project.

Understanding how login systems work is an essential skill for web developers because most dynamic websites require user authentication.

In the next tutorial, we will start building the user registration form and store user data securely in the database.