What are the limitations of using cookies with PHP for user identification, especially when users block cookies?

When users block cookies, the traditional method of using cookies for user identification in PHP becomes ineffective. One solution to this limitation is to use session variables to store user identification information instead of relying solely on cookies. By storing the user ID in a session variable, you can still identify the user even if they have cookies disabled. 

session_start();

// Check if user is logged in
if(isset($_SESSION['user_id'])){
    $user_id = $_SESSION['user_id'];
    // Perform actions for logged in user
} else {
    // Redirect to login page
    header("Location: login.php");
    exit();
}

Keywords

cookies PHP user identification limitations blocking

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