0 ? implode(', ', $ipv4Parts) : $agentIp; } elseif (strpos($agentIp, ':') !== false && filter_var($agentIp, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6)) { // If it's only an IPv6 address, we keep it or show N/A based on preference. Let's just keep it if no IPv4. } ?>