What are the potential drawbacks of using IP addresses for user identification in PHP applications?

Using IP addresses for user identification in PHP applications can be unreliable as multiple users can share the same IP address (e.g., in the case of NAT networks or public Wi-Fi). This can lead to misidentifying users and potentially causing security issues. To improve user identification, it's recommended to use more robust methods such as session tokens or user authentication. 

// Sample code for using session tokens for user identification
session_start();

if (!isset($_SESSION['user_id'])) {
    $_SESSION['user_id'] = generateUniqueUserId(); // Function to generate a unique user ID
}

$user_id = $_SESSION['user_id'];

Keywords

IP addresses user identification drawbacks PHP applications security vulnerabilities

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