What are the potential drawbacks of using IP addresses and browser identification to determine unique visitors in PHP?

Using IP addresses and browser identification to determine unique visitors in PHP can lead to inaccuracies due to shared IP addresses, dynamic IP assignments, and users accessing the website from different devices or browsers. To overcome this, it is recommended to implement a more reliable method such as setting a unique identifier (e.g., a cookie) on the user's browser. 

// Set a unique identifier on the user's browser using a cookie
if (!isset($_COOKIE['unique_visitor_id'])) {
    $unique_visitor_id = uniqid();
    setcookie('unique_visitor_id', $unique_visitor_id, time() + (86400 * 30), '/'); // Cookie valid for 30 days
}

Keywords

IP addresses browser identification unique visitors drawbacks PHP

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