What are the potential security risks associated with using the Referer to track image usage on different websites?

The potential security risks associated with using the Referer to track image usage on different websites include the possibility of spoofing or manipulation of the Referer header, leading to inaccurate tracking data or unauthorized access to sensitive information. To mitigate these risks, it is recommended to implement additional security measures such as server-side validation and authentication checks. 

if(isset($_SERVER['HTTP_REFERER'])) {
    $referer = parse_url($_SERVER['HTTP_REFERER']);
    
    // Perform additional validation and authentication checks here
} else {
    // Handle cases where Referer header is not present
}

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