What are the advantages and disadvantages of using IP addresses versus user IDs for tracking Captcha solutions in PHP?

When tracking Captcha solutions in PHP, using IP addresses can be advantageous as it allows for easier tracking of unique users without requiring them to log in. However, it can also be unreliable as multiple users may share the same IP address, leading to potential inaccuracies. On the other hand, using user IDs can provide more accurate tracking but requires users to be logged in, which may not always be feasible. 

// Using IP addresses for tracking Captcha solutions
$ip_address = $_SERVER['REMOTE_ADDR'];
// Code to store and track Captcha solutions using $ip_address

// Using user IDs for tracking Captcha solutions
$user_id = $_SESSION['user_id'];
// Code to store and track Captcha solutions using $user_id

Keywords

IP addresses user IDs Captcha solutions tracking PHP

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