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How can sessions be utilized to create a more robust and secure login system in PHP?

Using sessions in PHP can help create a more robust and secure login system by storing user authentication tokens securely on the server side. This prevents sensitive information like passwords from being exposed in the client-side code. Sessions also provide a way to track user authentication status and prevent unauthorized access to protected resources.

php 
// Start the session
session_start();

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

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