How can PHP developers ensure that only the logged-in user can access their own data in a web application?

To ensure that only the logged-in user can access their own data in a web application, PHP developers can implement user authentication and authorization mechanisms. This involves verifying the user's identity during login and storing their unique identifier in a session variable. Then, when accessing user-specific data, the PHP code should check if the logged-in user's identifier matches the owner of the data being accessed. 

session_start();

// Check if user is logged in
if(isset($_SESSION['user_id'])) {
    $loggedInUserId = $_SESSION['user_id'];
    
    // Retrieve user-specific data
    $userData = getUserDataFromDatabase($loggedInUserId);
    
    // Display or process the data
    // ...
} else {
    // Redirect to login page if user is not logged in
    header('Location: login.php');
    exit();
}

Keywords

authentication session management access control user data protection PHP security

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