How can PHP developers ensure that users who have disabled cookies can still remain logged in on a website?

When users disable cookies, PHP developers can use session variables to store user login information instead. By utilizing session variables, developers can ensure that users remain logged in on the website even if cookies are disabled. This can be achieved by starting a session when the user logs in and storing relevant user information in session variables. 

<?php
session_start();

// Check if the user is logging in
if (isset($_POST['login'])) {
    // Perform login validation
    // If login is successful, store user information in session variables
    $_SESSION['user_id'] = $user_id;
    $_SESSION['username'] = $username;
    // Redirect user to logged-in page
    header('Location: logged_in.php');
    exit();
}

// Check if the user is logged in
if (isset($_SESSION['user_id'])) {
    // User is logged in, retrieve user information from session variables
    $user_id = $_SESSION['user_id'];
    $username = $_SESSION['username'];
    // Display logged-in content
    echo "Welcome back, $username!";
} else {
    // Display login form
    echo "<form method='post'>
            <input type='text' name='username' placeholder='Username'>
            <input type='password' name='password' placeholder='Password'>
            <input type='submit' name='login' value='Login'>
          </form>";
}
?>

Keywords

PHP session management session cookies session ID user authentication

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