What are the benefits of using PHP sessions for managing user authentication and how can they be implemented in a login system effectively?

Using PHP sessions for managing user authentication provides a secure way to keep track of a user's login status without storing sensitive information like passwords in cookies. Sessions store the user's unique identifier on the server side, making it harder for malicious users to tamper with their authentication status. 

// Start a session
session_start();

// Check if user is logged in
if(isset($_SESSION['user_id'])){
    // User is logged in, perform necessary actions
} else {
    // User is not logged in, redirect to login page
    header("Location: login.php");
    exit();
}

Keywords

PHP sessions user authentication login system implementation benefits

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