How To Link Login Page To Database In Php

How To Articles

Linking a login page to a database in PHP is a crucial step in developing a secure and user-friendly website. As a web developer, I have encountered many challenges in creating a seamless login experience for users. In this article, I will share my personal insights and provide a detailed guide on how to link a login page to a database using PHP.

The Importance of Secure Login

A secure login process is essential to protect user data and maintain the integrity of a website. By linking the login page to a database, we can authenticate user credentials and manage user access effectively. This ensures that only authorized individuals can access restricted areas or perform specific actions.

Connecting to the Database

First, let’s establish a connection to the database using PHP’s built-in functions. We need to provide the necessary credentials such as the hostname, username, password, and database name.

// Database credentials
$hostname = "localhost";
$username = "your_username";
$password = "your_password";
$database = "your_database";

// Create a connection
$conn = mysqli_connect($hostname, $username, $password, $database);

// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());

Creating the Login Form

Next, we need to create a login form where users can enter their credentials. The form should include input fields for the username and password, as well as a submit button to initiate the login process.

<form action="login.php" method="POST">
<label for="username">Username:</label>
<input type="text" id="username" name="username" required>

<label for="password">Password:</label>
<input type="password" id="password" name="password" required>

<input type="submit" value="Login">

Processing the Login Request

When the user submits the login form, we need to validate the entered credentials against the data stored in the database. This involves executing a query to retrieve the user’s details and comparing them with the submitted values.

// Retrieve submitted credentials
$username = $_POST['username'];
$password = $_POST['password'];

// Query the database for user details
$query = "SELECT * FROM users WHERE username = '$username' AND password = '$password'";
$result = mysqli_query($conn, $query);

// Check if the query returns a match
if (mysqli_num_rows($result) == 1) {
// User authentication successful
// Redirect to the home page or display a success message
header("Location: home.php");
} else {
// Invalid credentials
// Display an error message or redirect to a login failure page
echo "Invalid username or password";

Adding Security Measures

To enhance the security of the login process, it is crucial to implement additional measures such as password hashing and user session management.

We can use PHP’s password_hash() function to securely hash the passwords before storing them in the database. When validating the user’s credentials, we can compare the hashed password stored in the database with the submitted password after using the password_verify() function.

Furthermore, we should implement session management to maintain user sessions and track their activities. This allows us to keep users authenticated throughout their browsing session and restrict access to certain pages based on their login status.


Linking a login page to a database using PHP is a fundamental aspect of web development. By following the steps outlined in this article and implementing additional security measures, we can create a robust login system that ensures user data protection and enhances the overall user experience.

Remember, the login page is often the entry point for users into your website, so it’s crucial to prioritize security and usability. With the right practices in place, you can create a login system that instills trust in your users and keeps their information secure.