How can PHP developers ensure secure user recognition without relying on IP addresses?

PHP developers can ensure secure user recognition without relying on IP addresses by implementing user authentication mechanisms such as sessions or tokens. By using these methods, developers can securely identify and authenticate users without the need for IP addresses, which can be unreliable due to dynamic IP assignments or the use of proxies. 

// Start a session to store user authentication information
session_start();

// Check if user is logged in
if(isset($_SESSION['user_id'])) {
    // User is authenticated, retrieve user information
    $user_id = $_SESSION['user_id'];
    // Additional code to fetch user data from database or perform other actions
} else {
    // User is not authenticated, redirect to login page
    header("Location: login.php");
    exit();
}

Keywords

PHP user recognition security authentication session management

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