How can a PHP developer differentiate between logged-in and non-logged-in users on a website?

To differentiate between logged-in and non-logged-in users on a website, a PHP developer can utilize sessions or cookies to store user login information. When a user logs in, a session variable can be set to indicate that the user is logged in. This variable can then be checked on each page to determine if the user is logged in or not. 

// Start the session
session_start();

// Check if the user is logged in
if(isset($_SESSION['user_id'])){
    // User is logged in
    echo "Welcome, logged-in user!";
} else {
    // User is not logged in
    echo "Please log in to access this page.";
}

Keywords

PHP session management authentication user status conditional statements

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