How can PHP sessions be utilized to keep a user logged in across various sections of a website?

To keep a user logged in across various sections of a website, PHP sessions can be utilized to store the user's login credentials or unique identifier. By setting session variables upon successful login and checking these variables on subsequent pages, the website can determine if the user is logged in and provide access to restricted content. 

// Start the session
session_start();

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

Keywords

PHP sessions user authentication session management website navigation persistent login

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