How can I detect if the user is on localhost in PHP?

Question

In other words, how can I tell if the person using my web application is on the server it resides on? If I remember correctly, PHPMyAdmin does something like this for securi

Answer 1

$_SERVER["REMOTE_ADDR"] should tell you the user's IP. It's spoofable, though.

Check this bounty question for a very detailed discussion.

I think what you remember with PHPMyAdmin is something different: Many MySQL Servers are configured so that they can only be accessed from localhost for security reasons.