jistanidiot

I know I can use $_SERVER['REMOTE_ADDR'] to get a user's IP address. However that only gives either the IPv4 or the IPv6 address, not both. I've seen sites that will give you both. I'm wondering how to get both with PHP. Is it some simple function I just don't know about or does it require some complex actions (If it requires something complex just point me in the right direction to get started)? Thanks in advance.