to fetch and display visitors IP address working on different operating systems on our own system

Question

If two persons using different operating systems(say linux and windows) visiting the same site and I want to fetch IP addresses of both person's system and see it on my system then how can I do that? I am working on PHP Codeigniter. Can anybody suggest me any solution for this?

Answer 1

For Codeigniter use

echo $this->input->ip_address();